Tia's Troubles

Chapters

A slow realisation
Testing Limits
More Than Friends (Celestia x Rarity)
Bigger Things (Twilight x Spike, breast & penis expansion)
Larger than Life (Spike x Twilight x Celestia, breast/butt expansion, penis expansion, hyper)
A Means To An End (Spike solo, Celestia x Discord, hyper/macro growth)
Solar Eclipse (Luna x Celestia, breast/butt expansion)
Back to normal (mostly)

A slow realisation

Celestia sighed softly as she lowered herself gently into her throne, her gigantic buttocks filling the space between the arm rests. In days gone by she wouldn't be touching the sides, but now her sizeable hips were wider than her throne, which was not a small piece of furniture. But she had been taking it easy for a few months, with her sister's advice. The most recent Summer Sun Celebration had really taken it out of her.

A while ago, Luna had made her concerns known.

“You can't expect to be an effective ruler if you are always exhausted, sister.”

“But Luna, the sun won't raise itself!”

“I am more than qualified to take care of matters, do not underestimate me.”

“Please, Luna, I wasn't suggesting you aren't capable. It's just... tradition.”

“But it isn't traditional for the reigning Monarch to doze off during a speech, is it? You need rest, and lots of it.”

“Okay, you win. But if you need any help--”

“I'm sure that won't be necessary. I want you to have some time to yourself, you've earnt it.”

Celestia smiled faintly.

“Thank you.”

That was 9 months ago. Celestia hated to admit it, but she was enjoying this 'easier' life. Luna still seemed to have no intention of relinquishing her “temporary” control over the Sun as well as the moon, which made Celestia feel she wasn't the only one enjoying this state of affairs. She couldn't blame Luna, it had always seemed as though she was in Celestia's shadow, and the opportunity for Luna to prove to her sister, and all of Equestria, that she was fully capable of looking after things was too good to pass up.

So, Celestia let things stay as they were. But taking it easy began to take its toll on her previously slim physique. She had always been large-breasted, yes; but her hips, thighs and bottom had always been rather... average. Perhaps somewhat larger than your typical Equestrian citizen, but nothing eye-catchingly impressive.

This had changed. She wasn't fat per se, although she was a little softer round the edges, and had a slightly larger stomach that protruded a couple more inches than it once did. No, most of the extra padding had gone to specific places. And there was a lot of padding. Her hips were wider than her shoulders, her thighs touched almost to her knees, and her butt cheeks, round and semi-firm, extended out almost a foot from her back. They were soft to the touch, and jiggled when she walked, unless she wore tighter clothing. But that wasn't too often, as she didn't have much to accommodate a rear of that size, let alone her 55 inch hips. She made a mental note to see that skilled fashionista with the purple hair about getting something that fit her properly. Wearing leggings was all well and good around the castle, but out in public? She was unsure. Leggings were casual and unassuming, but they didn't hide her substantial booty meat, and didn't offer any support either, meaning her large cheeks were free to bounce and jiggle around unrestricted.

“I imagine many of my male subjects would appreciate it though...”

She thought aloud. Maybe she would try it, just once, and if the reaction wasn't too overwhelmingly harsh she would make a habit of not always being dressed formally. Sure, a ruler was expected to dress properly, but times were changing. Did Celestia still have to dress prim and proper every time she went out? For public appearances, openings, speeches and such, of course: yes. But a casual stroll around town, or a visit to Twilight Sparkle's library didn't strike her as something that required full regalia.

She stood in front of the mirror in a bra and underwear, and was quietly amazed by her slow transformation into the voluptuous figure she saw before her. She gave an ass cheek an experimental squeeze and was pleasantly surprised by its softness. Her hand was nowhere near large enough to grasp the entire cheek; the sheer size of it gave her a sense of empowerment. A desire to crush someone beneath it briefly overcame her...

She ran her hands up her sides, and they followed the exaggerated curve of her hips before tapering in to a small(ish) waist. She grasped a thigh, and her fingertips nearly vanished inside the soft mass of flesh. Maybe she didn't have the body of a model, but she loved having curves. Her breasts, which had been big for as long as she could remember, had grown to epic proportions with her weight gain. She now wore a 42L bra, and couldn't see her feet unless she tilted her head far forward. These jutting pillows would have looked outrageously large on someone smaller than her. No doubt they looked huge on Celestia too, but being 6 foot 5 and very curvy made sure they didn't look out of place.

Actually, this bra was beginning to feel a little tight. She stood closer to the mirror to get a better look, her large nipples, visible even through the extra-strong cup, nearly prodding its surface. This brassiere was a perfect fit when she first tried it on a month ago, but now breast flesh was beginning to ooze out from underneath, and spill over the sides. She was worried that one of these days her boobs would try to make their escape and snap her bra strap in two.

At the back of her mind, she had a desire to be bigger, curvier, for a very long time. She knew what her ancestors looked like; how most Equestrian royalty had looked throught the millenia, and they weren't skinny. Some years ago she had a secretive meeting with Zecora in her hut, and reluctantly expressed her wishes to the miracle-working eccentric. The end result was a dull blue liquid, about a liter's worth, that Zecora said would be more than enough to make her the curviest woman there ever was. Celestia could barely contain her excitement, and was in fact a little anxious; it sounded like very powerful stuff. So, she took it home and stored it at the back of her shelf of potions, out of sight, keeping it in case she really couldn't bear being skinny for much longer. But, with the passage of time and a very busy few years with the arrival of Twilight and her friends and the events surrounding them, she forgot about the vial and didn't have much time to think of her figure. But now, stood in front of the mirror, she remembered the vial and where it was.

“I don't think I have much need for it now, look at the size of me...”

She devoured herself with her eyes. Her pronounced curves were beyond impressive, and she was actually getting turned on from her own reflection.

“But... maybe I could have some fun with it some time.”

She smiled at herself in the mirror, admiring what she saw as an improvement to her body. She turned, this act alone enough to make her cheeks ripple slightly, and walked over to her closet. Half of the clothes in it didn't fit her any more (unless she really wanted to draw attention to herself), and it was only going to get worse. As her size continued to increase, she moved out of standard sizes that could be found in stores, and into the realm of tailoring. But she hadn't felt ready for the level of intimacy required to go to a tailor and expose herself. However, she knew Rarity better than any other tailor, and felt prepared to make an exception for her.

But today, she'd just wear what she usually wore around the castle, a plain, white T-shirt and some deep purple jogging sweats. Perhaps not the grandest of attire but perfectly suitable for lounging around. A few weeks back, while walking past a clothes shop, she happened to notice a pair of female briefs with BUBBLE BUTT emblazoned across the rear. She giggled out loud, and nearly went in to buy them, but then remembered who she was and how she was expected to behave.

“It's no fun being ruler...” she sighed to herself, and walked on.

When out and about, but not in full regalia, she'd usually wear something awfully formal like pencil skirts or even trousers, much like a principal. She didn't like it, but she was worried that if she dressed down, her subjects would think less of her.

She pulled the T-shirt over her head, struggling slightly with the projection of her huge breasts. But the sweatpants were harder. She bent over and put each foot into each leg. Getting them up to her knees was no trouble. Her thick thighs offered a little resistance, but it was her jutting ass that caused difficulties. The shelf of meat was a barrier to her pants, and each time she wore them this process seemed to get a little more difficult. She gripped the pants and jumped up and down, trying to force them up over her cheeks, causing them to wobble violently. Slowly but surely the pants swallowed up her giant butt, the globes of flesh seeming to resist imprisonment. The sweats weren't tight once she had pulled them over her ass, but her big hips held them in place. Satisfied, she turned, and walked out of her bedroom, her boobs and butt wobbling freely. She noticed that her hips only cleared the doorway by a few inches... the doorway hadn't always been that narrow, had it?

“Well, time for a little work-out.”

Celestia hadn't been completely idle these past few months. While she had been less active, the work-outs persuaded the build-up of extra fat to go to the right places. She entered the small castle gymnasium and flicked the light switch. Then, she walked over to the sheet of paper taped on the wall with her daily routine. Today was lunges, chest presses and squats.

Testing Limits

Celestia was proud of her sister, and all that she had achieved in her time as acting ruler. Both sisters were happy to allow each other to carry on as they had been for some time now. But that didn't give the princess of the Sun an excuse to not keep up her exercise regimen, which consisted of making a visit to the palace gym every other day.

However, while the two sisters didn't have a problem with the situation, they agreed that this couldn't go on forever.

“My dear Luna, I'm so proud of you and all you've managed. Sometimes I think you'd do a better job than me!”

Celestia wasn't being serious, she was just trying to praise Luna, but her sister suddenly looked worried.

“Please Celestia, I couldn't possibly take this away from you, it was what you were born to do! Don't step down!”

Celestia laughed aloud.

“I was only joking, Luna. Just trying to give you some idea of how well you've gotten on. It's coming up to a year now, isn't it?”

Luna, now smiling, nodded.

“Okay, well, the first anniversary of your role as regent ruler seems like a good occasion for my return, does it not?”

Luna beamed, and nodded again.

“Certainly!”

“Well then, that's decided. This carefree life is nice and all, but I'm starting to miss everything I had before. The grass is always greener on the other side...”

She looked into the mirror on the opposite wall, taking in her voluptuous curves.

“I hope my subjects aren't too bothered by my rather dramatic transformation.”

“I'm sure they won't. The men certainly won't anyway. I think you look positively ravishing, sister. It suits you!”

Celestia blushed ever so slightly, not enough for her sister to notice.

“Thank you, Luna. I think you're right. Well, enough idle chatter. I've got some working out to do.”

She smiled, and turned, heading down the corridor to the gymnasium. Luna was mesmerised by the rising and falling of her sister's substantial ass packed into sweat pants that seemed a size too small.

“Gosh, what I wouldn't give for a body like that.”

Celestia sauntered over to the exercise mat, gazing at herself in the mirrors that ran the length of the gym. Her pristine, prismatic hair flowed around her shoulders, and her bright violet eyes stood out from her flawless, pale complexion. Her gaze moved inexorably downward, and she watched as her full, globe-like rear rose and fell with each step, and her boobs, straining against her bra, filled out her t-shirt and almost covered her navel. She stopped by the mat, her ass continuing to bounce briefly with the momentum it still carried within its immense expanse. She looked down at her legs, her thighs bulging, packed tightly in the sweatpants. The problem with having huge thighs was they rubbed against her nether regions and her over-sized clitoris, which was currently throbbing faintly.

“Damn, I need to take care of that later... I feel like I'm going to explode. But these pants may explode first. They're getting too small already, and I only got them 3 weeks ago!”

She made a mental note to 'satisfy' herself later that night. But she also felt she needed someone other than herself to make her feel even better. There was no shortage of more-than-willing subjects that would do anything to please her, but she didn't want to dive on to the first guy that openly showed interest.

“He's gonna have to be well-equipped, these curves of mine need a whooole lot of loving...”

And that sure wasn't an overstatement. Her body was huge - she was tall and curvy even before her weight gain, but now, her figure was deliciously filled out. Only the largest member would satisfy such a full figure. Of course, if he was sweet and cute that would be a plus. But in her current state of mind she really didn't care too much about that. She needed a cock - the biggest she could find. These thoughts were making her more and more pent up. Her fat, throbbing clit was now visible through the tight pants. She shook her head rapidly, trying to clear her mind, and spoke aloud.

“Get a hold of yourself, Celestia! There is a time and place for thoughts like those. But these damnable urges! it's getting hard to keep them under control.”

She couldn't remember the last good sex she had. Not only was she unsatisfied with the size of the average Equestrian penis, she simply hadn't had the time for any meaningful sexual relations with anyone. Life was far too busy. But with the sudden excess of free time she now had, she could finally seek out some kind of sexual gratification, other than her own hands. Masturbating was all well and good, especially with her huge and ever-expanding tits and nipples which, when hard, were the size of quarters that she could fondle to her heart's content, but it fell short of the real thing. But enough teasing herself with what she'd do tonight, she had a work-out to be doing!

First up was lunges. She took a pair of small 5 kilo weights from the rack and held them by her side. The little weights in her little hands looked quite comical beside her expansive hips and impossibly globular ass. It was almost as if she had stuffed two over-inflated basketballs down her pants. But basketballs didn't jiggle and wobble like her rear did.

Celestia widened her stance slightly, stepped forward with her right foot, and dropped slowly into her first lunge. Her left thigh pushed up against her left ass cheek, compressing the globe of meat and forcing it up and outwards, while her right cheek curved down and underneath. The position of her lower body put extra strain on her already-tight sweatpants, and they squeezed her hips. Almost inaudibly, the seams along the sides gave way a fraction as her thick hips forced their way through the surrendering fabric. Celestia froze, looked at her hips, and blushed slightly. This angle really showed how wide she'd gotten. Her hips swelled out a few inches from her side before the gentle curve back in to her waist. But she couldn't see much of her waist because of the thigh flesh bulging out.

Cautiously standing up straight again, Celestia replaced the weights on the rack and walked up close to the mirror to survey the damage her hips had caused. Turning side-on, she saw a series of small gaps where her hips were widest, and little globules of flesh forcing their way through the holes. It wasn't serious, but it drew attention to her already breath-taking hip flare. She decided that lunges would have to be put on hold until she got some (even) bigger sweats. So, it was over to the chest press machine. As she walked over to it, she looked down at her chest-pillows bouncing up and down, almost touching her chin when they rose up. Even though she was wearing a high-neck t-shirt there was still some cleavage exposed. Her breasts protruded so far from her chest that they pulled the shirt outwards, exposing the very top of her breast shelf. Her breasts were all-natural, but maintained an enviable firmness, even when she was bra-less. They did tend to get in the way in bed, though. If she laid on her back, they touched her chin. This wasn't caused solely by the sheer size of her boobs, but her big ass raised her lower half up an inch or so when she laid on her back, making her tits roll downward slightly, putting them beneath her chin. In the summer it was a pain, but in the colder months they could be nestled into.

Her breasts were large enough for her to easily lift her nipples up to her mouth. The feeling of suckling on a nipple alone was orgasmic, and their sensitivity never ceased to amaze her.

A slight look of concern crossed her face.

“Let's hope I don't tear this shirt too.”

She eyed the chest press machine and wasn't impressed. Maybe this time last year it would have sufficed, but her wide rear was much larger than the seat. At least having huge, soft ass cheeks made virtually any surface comfortable. This particular machine had the handles mounted either side of the seat, and would come up just below her shoulders when pulled back. They wouldn't have come up quite so far when she was smaller, but now all the junk in her trunk rose her up an extra couple of inches when she was seated.

Before even starting, she could see there was going to be a clearance problem between her jugs and the grips. The space between the bars they were attached to seemed a little too narrow. Still, not willing to quit before trying, she slowly exhaled, grasped each handle, and drew the bars towards her. The effort made her thrust her chest out slightly, her big nipples tenting the shirt that clung to her giant bosom. As she feared, before she could pull the bars all the way back they were blocked by the sides of her breasts, so she could only perform about two thirds of a full press.

“Dammit, why do my tits have to be so huge?”

She frowned at one of her monster knockers, then the other, then sighed and rolled her head back. The creases of irritation dissipated from her forehead. She thought to herself; sure, having massive tits caused a few little niggles, but it felt so fulfilling, so empowering, to be gifted with such incredible breasts, let alone the rest of her unique body.

It was apparent to her that this machine was really built with a smaller person in mind. The narrow cushion looked positively tiny beneath her immense buttocks, and of course there was the issue with her breasts and the bars. Still, she finished her two sets of 50 presses each, rested briefly, then lifted herself up.

She turned, and noticed the seat was a little damp. She looked over her shoulder at her butt. With an inquisitive look, she ran a hand along the crease between her cheeks. The supple flesh parted as her fingers traced along the deep crevice.

“Wow, it's like a furnace back there.”

She wondered how she could cool herself down. She glanced mischievously at the mirror. There was no harm in having a little fun, was there? Especially when she was alone.

“Ah-ha! I'm sure no one will notice...”

She pulled her sweats down over her ass, and then her underwear. She looked around quickly, and, satisfied no one was nearby, backed her bodacious bubble butt up against the mirror's surface. Her soft cheeks spread out across its surface.

“Eep!”

Her eyed widened, the mirror felt ice cold! Soon her shock turned to relief as she felt the heat in her rear fade away. She pulled away from the mirror, and with some difficulty stuffed her over-sized posterior back into its cloth prison.

She looked back at the mirror and gasped quietly, covering her mouth with her hand. The area where her butt had met the mirror was clearly shown in two large, near-circular areas of sweat that clung to the surface. What surprised her was the sheer size of this area; it was just under two feet across.

“Goodness, how big have I gotten?”

She groped each cheek in her hands, and was once again amazed, not only by their immense size, but by how soft and pliable they were.

“Hmm. Very big, it seems.”

After getting a tiny bit carried away and squeezing her mounds of meat for a little longer than was necessary to judge their size, she remembered she still had her squats to do.

“This can't end well for these pants. But screw it, I need a bigger pair anyway.”

Returning to the mat, she stood with her feet apart, hands clenched into fists by her sides. She looked back again at the mass of ass extending out from below her back, and hoped it wouldn't obliterate her pants too quickly.

Carefully, cautiously, she bent her knees and kept her back straight as her butt descended towards the ground. If anyone had happened to be underneath, it would appear as though the apocalypse had come, and a gigantic asteroid not dissimilar to the one that wiped out the dinosaurs was going to crash straight on top of them.

Celestia was relieved to find that she had completed a full squat without tearing her pants in two. But what wasn't obvious was the fact that the seams were very close to giving way, and it wouldn't take much more persuasion for them to give up and split apart from the unrelenting tidal wave of flesh pressuring them, squeezing between them, pushing against them. The already-weakened seams along the hips of the pants weren't fairing too well either.

Unaware of the life-or-death struggle between her ass and her pants, Celestia continued to squat, with each descent spreading her wide ass cheeks and making her long butt crack even more obvious. Each time she rose back up to a standing position with quickness, her cheeks would give a little jiggle, and her boobs would give a little bounce, before settling into place. Then the process would repeat, and her butt would slide downward, extending out. Perhaps having such a heavy weight behind her would have caused difficulty with keeping balance, but her 42L breasts were also very heavy, and stopped her from falling back. Not that it would hurt if she did with her built-in cushions.

After a set of 30 squats, Celestia realised she wasn't feeling a burn like she usually did. She looked down and over her jutting chest, and noticed her feet were fairly close together. She widened her stance again in an attempt to get a deeper, fuller squat, and bent her knees.

This wider stance increased the width of her lower body in the squatting position, her cheeks pulled further apart by the action. This was the breaking point for the pants, they couldn't take any more punishment. Slowly, with each squat, they weakened a little more. By squat number 24, they finally gave up.

RRRIP!

A huge tear opened up between her cheeks nearly the full length of her ass, and a gash opened up along each hip, flesh forcing its way through. A little embarrassed, but giggling, Celestia quickly straightened herself.

“Well, pants, you put up a good fight. But not good enough, I fear.”

She approach the mirror to survey the damage. The tearing loosened the pants and made them more comfortable, but that wasn't really enough to justify wearing them in this state. Half a foot of ass cleavage was visible through the tear at the back. She raised an eyebrow.

“If I keep growing like this, I'll having nothing that will fit me any more. I need to see Rarity, and fast.”

She tiptoed out of the gym and back to her chamber, hoping no one would see what she had managed to do to her clothing. She slid the sweats over her butt, the waistband still giving her a hard time, and held them up in front of herself. This really was the final straw, she had to overcome her fears and see a tailor. At least Rarity was a friend, and being exposed to her would hopefully be less awkward.

“No point putting it off any longer, I'd better get down there tomorrow.”

More Than Friends (Celestia x Rarity)

The sun shone brightly through the gap in the curtains, the beam of light slowly rising towards Celestia's face. It reached her eyes; she frowned, and opened them.

“Another good sunrise, sister.”

She yawned, stretched out her arms, and kicked off the duvet.

“What to wear... can't make a fool of myself in front of her, she knows what's in and what's out.”

She was referring to Rarity. As Celestia's curvy figure expanded, the amount of correctly-fitting clothes shrank. Rarity was the only person she felt she could be comfortable with in only underwear. They had known each other for many years, and had become close. If it weren't for her status, and how busy she was, Celestia would have spent much more time with her. She was very pleasant. And, she admitted quietly to herself, rather attractive.

The Princess didn't consider herself a lesbian by any means, but she could recognise (and appreciate) a fine example of the female form when she saw it. In fact, when she thought about it, a few of Rarity's friends were rather desirable as well. Rarity had a textbook hourglass figure with DD-cup breasts and 40 inch hips, not to mention her beautiful face and flawless, deep purple hair.

Then there was the incredibly cute Fluttershy with her substantial K-cup monsters which she attempted to hide, unsuccessfully, in a variety of unassuming clothes.

There was also the pear-shaped farm girl, Applejack, with her 48 inch hips and a butt that rivaled Celestia's. She loved jeans, and they loved to hug her huge booty.

Just thinking about them brought a small bead of sweat rolling down Celestia's forehead. How could she have neglected these girls and their oozing sex appeal for so long?

“Perhaps that'll change soon...”

After a pause, she settled on a full-length maxi skirt and button-up silk shirt, but the changes to her body meant they fit a little differently. The skirt didn't go down as far as it once did, her hips and rear held it up slightly, and her expansive chest meant many of her shirt buttons were strained to breaking point. But it would have to do; each day she grew larger, her range of wearable clothes shrank, which was the very reason for her visit to Rarity this morning.

She picked up the torn sweats and bundled them into a small handbag before leaving the palace and making her way to the Carousel Boutique. She was a little nervous about seeing Rarity; she hadn't really been seen by anyone up close for some time, and her figure had drastically changed. She hoped rarity wasn't too shocked, otherwise this whole visit would be very awkward.

The sun wasn't long over the horizon; she had left early to avoid too much attention, which was probably a good thing as her outfit was a tad inadequate for the amount of flesh it was expected to contain. Her butt cheeks straining against the skirt gave the impression that she had stuffed two prize pumpkins down it, and with each step her ass gave a little jiggle, the slightest vibration setting her mounds into motion. The buttons on the shirt weren't doing very well either, her cleavage visible between the gaps. It almost felt as though her clothes would explode at any moment; she quickened her pace just on the off-chance that her clothes may give up in public.

“I hope she's awake...”

Celestia approached the Boutique, the sun was now fully visible behind her. She walked up to the door and noticed how small it was, for her anyway. It was made for the average person, not a seven-foot tall voluptuous goddess. She noted the width of the door frame, and then looked down at her 55 ½ inch hips. This could be close! Unless, of course, she walked through sideways, but that would be quite embarrassing. She looked over her shoulder at her jutting ass extending proudly outward at least two feet, and then at her expansive breasts straining to be free of her shirt, and worried that even if she did go through sideways her boobs or butt might squish against the frame.

“Ah well, I'll cross that bridge when I come to it.”

She extended a slender arm and rang the bell.

“Just a moment!”

“Well, at least she's awake.”

She faintly heard foot steps approach, then a latch clicking, before the wooden door opened inwards revealing Rarity in a simple yet elegant purple satin slip dress that cradled her full bosom and highlighted the curve of her hips.

“Hello and welcome to-”

Rarity stopped, noting she was staring eye level at an enormous pair of breasts, with nipples the size of cherries tenting the fabric that was trying desperately to keep the huge orbs contained. She looked up, and meeting her gaze was the beautiful face of Princess Celestia, her colourful hair shining in the morning sunlight, her amethyst eyes almost hypnotic in their piercing brightness. She was grinning sheepishly, hoping that Rarity didn't stare for too much longer.

She quickly curtsied as a sign of respect to the reigning Monarch.

“Your majesty, what a surprise!”

“Thank you, Rarity, but we've known each other for a long time. I don't mind if you call me Celestia.”

She smiled; Rarity stood up straight again and smiled too.

“Please, come in. It's quite a chilly morning.”

“Indeed...”

Celestia glanced down at her big, hard nipples, her bra unable to hide them.

Rarity followed her gaze and eyed the giant breasts hungrily, biting her lip. She cleared her throat and turned, Celestia following.

“Well, here goes nothing.”

She stepped through the door, and her hips just brushed the door frame. She breathed a sigh of relief.

Rarity led the way into the centre of the room, surrounded on all sides by a dazzling array of stunning pieces that were a testament to her talent as a dressmaker. Celestia's eyes happened to land upon Rarity's rather sizable derrière, jiggling freely in the loose dress that caressed its pronounced curve. It wasn't enormous like Celestia's own, but it was definitely larger than average. The same could be said of her bust. She also noted her flawless midnight purple hair, luminescent under the studio lighting, and her fair, unblemished skin, not unlike Celestia's complexion.

Rarity seated herself in a plush armchair, leaving a two-seat sofa for Celestia to occupy. She sauntered over to it, giving Rarity a full view of her expansive rear packed tightly into her skirt. Rarity's eyes widened, her mouth slightly agape, but she recovered just before the Princess turned back toward her. As she fell into the seat, Celestia's buttocks compressed and widened, almost filling the space between the arm rests of the two-seater. Rarity thought to herself.

“Wow, she's really grown. I've never had a heartfelt attraction to someone of the same sex, but that body is doing something to me...”

She was in a trance brought on by Celestia's incredible curves. The Princess was a little worried; did Rarity think she had let herself go? She managed a quiet “ahem.”

Rarity startled, as if she had been caught snoozing in class. She blushed visibly, and a quiet, nervous laugh escaped her lips before she leaned back into the chair, smiling awkwardly at Celestia.

“I'm so sorry, your Highness! It's just you look so... different. Not in a bad way!”

Celestia looked down at where her feet would be if they weren't hidden behind a wall of flesh. She seemed a little disheartened.

“I'm afraid I lacked the discipline to keep the weight off during my time away from the throne. It was such hard work, and I was falling behind with my duties. Thank goodness Luna was there to cover for me while I recuperated. But all that lazing around...”

She gestured at her curvaceous body. Rarity didn't see any problems. Celestia's face was still slim and delicate as it always had been; her stomach was very nearly flat; her beautiful sparkling hair was still resplendent. The only changes Rarity could notice were to her breasts, rear, thighs and hips. Rarity was very much an advocate of 'plus-sized' or 'generous' figures and the exciting challenges associated with tailoring clothes to fit voluptuous physiques.

“And the Princess may just have the most voluptuous body I've ever seen!”

She walked over and squeezed in next to Celestia, the Princess' hips filling one cushion and nearly half of the other. Rarity laid a hand gently upon her shoulder and leaned around in front of her sullen face.

“Celestia, my dear, you don't have anything to be ashamed of! If anything, you look better than when I last saw you. You're a very tall woman, and not having any meat on your bones, so to speak, really wouldn't suit you. In my humble opinion anyway. Why, I'd give my right arm to have such a generously-endowed figure. Your body is to die for!”

Celestia lifted her head up and gazed into Rarity's twinkling purple eyes.

“Is that what you honestly think?”

“Certainly! I-”

She paused.

“I think you're incredibly attractive, Celestia. Not that you haven't always been beautiful, but the new you is just so... perfect.”

It was Celestia's turn to blush, and her cheeks glowed with a faint red tinge. But she couldn't help smiling.

“Thank you, Rarity. Really. I must admit, it fills oneself with a certain satisfaction, having a fuller figure. For quite some time I was worried that those around me wouldn't approve of these changes, but both you and my sister seem to think it suits me, and I'm inclined to agree. Some of the guards can't seem to take their eyes off me!”

They both giggled. Celestia was thankful that the meeting had become a relaxed one, and not cold and formal.

“Enough about me, how are you?”

“Oh, not bad at all. Although, like yourself, I'm a little softer around the edges than I once was. But I don't think I carry it as well as you.”

Celestia laughed aloud. 'Soft around the edges' was a marked understatement when it came to her current form.

“We girls all have our insecurities, it seems. You look ravishing, Rarity. And I'm not just saying that.”

Rarity beamed, and hugged Celestia. But she quickly withdrew when she remembered this was royalty sat beside her.

“Oh, Rarity, there's no need to worry! We're friends. Close friends.”

She leaned in and gave Rarity a peck on the cheek. The contact made her shudder with desire, and Celestia laughed.

“Goodness, in all this excitement I nearly forgot why I came here.”

She stood up and turned to pick up her handbag that had been sitting on a small table beside the sofa. She bent forward to reach for it, her huge buttocks mere inches away from Rarity's face, who was once again blown away by their size and splendour. She almost reached out to squeeze it but brought her urges under control. Celestia stood in front of Rarity with the handbag, undid the zip running along its length, and produced a pair of purple sweatpants. She unfurled them, revealing the long tears over each hip and the rear. Rarity raised an eyebrow.

“Were you attacked by timber wolves or something?”

“Not quite. This is why I came here; I'm simply outgrowing my clothes. I did this while I was exercising yesterday.”

“I would've liked to have seen that... Oh, what a pain. But don't fret! You came to the right tailor.”

The Princess smiled, and stuffed the pants back into the handbag. Rarity stood up, and gestured for Celestia to follow.

“Now, as always, I must begin with your measurements. Are you comfortable with me taking them?”

Celestia briefly looked down at herself, but quickly raised her head again and nodded, smiling.

“Excellent! If you'd care to go behind the screen and remove your outer garments, we can begin.”

She did as Rarity asked, and stepped into the rather small cubicle. She was quietly relieved to get these clothes off, they were rather tight. She methodically undid each button on the silk shirt, revealing her seemingly unending cleavage and very slightly pudgy stomach, much of which was overshadowed by her bust. With the buttons undone, she pulled the shirt off over her head, leaving only her bra, a frilled, white affair that was simplistic, yet beautifully made. Even though it was the largest bra she could find, it was still a little small. It dug in to her breasts a little, creating a small overhang of flesh along its upper rim. Her large nipples were well-defined, even with the bra covering them, poking into the centre of each cup, their size making them impossible to miss.

Next was her maxi skirt, which clung to her bottom and hips, and almost reached her ankles. This would be a little more challenging, especially in the narrow cubicle. She unfastened the button and opened the zip below it, exposing her white frilled panties which matched her bra. She began to shimmy the skirt downward, slowly uncovering her thick, soft thighs which touched almost down to her knees. She bent over to push them down further, resting against the cubicle wall behind her to keep balance. The cold of the wall against her rear surprised her a little, but the warmth retained in its vast mass soon warmed it up.

“Maybe I can warm Rarity's hands up later...”

The thought of Rarity's petite hands kneading her big ass cheeks drove her wild.

After a bit of a struggle the clothes were off, and Celestia stood in only underwear. She felt decidedly comfortable with herself, even in the presence of someone else. Slowly but surely, she was learning to love her body. She was looking forward to sharing it with Rarity.

Rarity, who had been lounging in the chair reading a newspaper, looked up at the sound of a handle being twisted. The cubicle door glided open, and Celestia stepped out in her underwear. Rarity nearly gasped aloud but restrained herself to a quiet intake of breath.

“I'm ready, got the tape measure?”

Celestia stepped forward, her huge breasts wobbling and oscillating despite their containment. The top of her panties sat just below her trim waist, resting atop the incredible width of her hips, while the middle band disappeared between her juicy thighs. Her candy-pink nails on her hands and feet and her violet eyes stood out against her pristine skin. Rarity saw nothing less than perfection from top to bottom (no pun intended).

“My word, you are something special, aren't you?”

Celestia could only blush and give a little smile.

“You're too kind. Okay, let's get to it.”

Rarity produced a small silver tape measure and approached Celestia. As she neared, her nostrils were filled with the sweet smell of perfume emanating from the Princess; a delightful floral scent so heady that she could practically drink it.

“Just hold this end here and I'll begin with your bra size.”

Celestia pressed her thumb against the tip of the measuring tape, and Rarity drew it around her back and above her bosom. Next, across the bust, and finally the band size, beneath her breasts. Thankfully it went without a hitch, apart from a tense moment when Rarity wrapped the tape around the bust, pressing firmly into Celestia's swollen nipples and nearly making her whimper with pleasure.

“Gosh. You're an LL-cup.”

“Really? So I am still growing. No wonder this bra is a little tight, it's only an L.”

Rarity snickered.

“'Only'?

“You know what I mean!”

“I do. Even a bra as large as yours couldn't contain these beauties.”

Rarity, plucking up courage, put down the tape and placed a hand on each side of Celestia's boobs. They looked positively tiny against the tremendous orbs. She gave a little squeeze and the Princess responded with a soft moan, closing her eyes and smiling.

“I can't take my eyes off these... they're incredible.”

Rarity looked up into Celestia's face, partially obscured by the projection of her breasts.

“I can't say anyone has shown as much appreciation of my figure as you, Rarity. I'm so glad you like it.”

'Like' was an understatement. They were so perfect that the fashionista was forgetting about the task in hand. But there are few things more distracting than a pair of immense, soft, spongy udders that just happen to be attached to a tall, voluptuous and beautiful monarch.

“And I'm so glad you came to see little old me. I had no idea you had turned into the epitome of feminine beauty! But enough idle chatter, I'm here to provide a service for you.”

She picked the tape up once more and drew it around Celestia's waist. It wasn't exactly pudgy, but it was soft to the touch.

“29 inches. Very trim for someone with such incredible assets! Okay, now for the hips.”

Rarity felt her heart rate ramp up. Celestia's hips and butt were without equal. If her chest was breathtakingly impressive, her lower assets were heart-stopping.

“I hope that tape measure of yours is long enough.”

“I hope so too, those hips of yours are awfully wide, aren't they?”

Celestia rolled her eyes, and put her hands on those wide hips, smiling.

As before, Rarity gave the end of the tape to Celestia who held it against her hip, while the tailoress started round. For the first time, she got a view of that incredible backside in only underwear. Words could hardly describe its majesty.

It was wide yet perky, maintaining a curved bubble shape that would be evident on the toned rear of a gymnast, but its immense size was a quality of its own. Despite the weight of such a large behind, there was barely any sag. Rarity had heard the terms ghetto booty and bubble butt, but this was a hybrid of the two. It was enormous but also perfectly curved and seemingly firm. But Rarity noticed that the tape sank about half a centimetre into the flesh as it pressed against it, hinting at how soft and doughy it really was. It truly was the perfect butt, and not for the first time she had to restrain herself from reaching out and groping it.

She remembered that the Princess remarked she had still been growing when it was revealed that her bust had indeed risen from an L to an LL, and Rarity could only assume that her bottom had been expanding too. It certainly looked that way; the panties were fast-becoming a thong as the cavern between her two huge cheeks was beginning to swallow the material.

At last, two ends of tape met, and Rarity drew it back in.

“55 and a half inches. If that's not impressive I don't know what is.”

Rarity was speaking slowly, as if in a trance. Celestia, looking a little bashful and a tad smug, spoke.

“Well, I hope I don't use up too much of your material.”

“Nonsense! There will be no compromises for our ruler, I shall see to that. I'm positive that body would look fantastic in anything.”

The Princess gave a sultry smile and stepped toward Rarity.

“Thank you. But I'd quite like it if you saw to something else as well.”

Before her companion had a chance to respond, she unhooked the rear strap, pulled the bra away and released her breasts from their restrictive prison, allowing the great orbs to flop down against her chest and abdomen. She shook out her hair, sending her chest into a convulsive wobble. With no support, even the smallest movement produced a jiggle. She stepped towards Rarity, whose mouth was now agape, eyes as big as saucers, hypnotised by the naked chest bouncing to and fro.

She stopped inches away from Rarity, who was virtually eye level with Celestia's nipples. Her view was filled by the royal bosom, each topped with a sizable fleshy nub.

“These nipples of mine have been rock-hard since I got here. Would you mind taking care of them? I'd do it myself, but the skilled hand of Equestria's premier seamstress may well do a better job.”

Rarity was about to speak up and point out that her skill with needlework didn't necessarily translate into expertise with pleasuring monarchs, but the chance to fondle the rosiest, perkiest teats in the kingdom was an opportunity she wasn't very willing to discard.

Without speaking, she lifted a hand and cupped Celestia's left breast. It was too large to fully handle, but she held it firmly from underneath. With her other hand, she gently squeezed the tip of the nipple with thumb and forefinger. Celestia closed her eyes and a quiet moan escaped her lips as Rarity squeezed a little harder.

“Ooh, nnn...”

They were both surprised by a thin stream of milk escaping the nipple and wetting the back of Rarity's hand. Keeping eye contact with Celestia, Rarity raised her hand to her mouth and lapped up the milk, savouring its sweet flavour.

“Delicious...”

Determined to delve deeper into the sweet bounty, Rarity grasped the watermelon-sized orb with both hands and slid the entire nipple into her mouth, dancing her tongue over and around its soft, puffy surface.

“Oooofff, that's good.”

Celestia cradled Rarity's head with her left hand, her silky-smooth purple hair caressing her fingertips. With her other hand she hefted her right breast and took the nipple in her own mouth, sucking hard. A spray of milk coated her tongue and she swallowed it eagerly. Meanwhile, Rarity was sucking like a new-born baby, short and fast sucks that felt like tiny electric shocks through her nipple and areola. The huge udders had a plentiful supply of milk that had built over a long period of time. Celestia hadn't released the contents of her breasts for a long time, and she was very backed up, explaining why the milk was escaping at such a high pressure and velocity.

Being an ageless semi-divine being, Celestia's fertility far exceeded that of the regular person. She hadn't had any children so this trait didn't really reveal itself. But it did mean that the milk glands in her breasts were many times more productive than average ones. Not only could they store much more milk, but it was replenished quickly. Her milk ducts, which transported milk from the gland to the nipple, were wider and more developed too. This allowed milk to flow in larger quantities and at higher speeds.

This had been irrelevant up until now, but the prolonged stimulation of her nipples and breasts was awakening those long-dormant glands.

Rarity paused her sucking as she felt the nipple resting on her tongue swell and enlarge. Frowning, she pulled it out of her mouth with a quiet pop and eyed it. It was growing!

“Whoa...”

Celestia paused, nipple in mouth, and looked down at Rarity, who seemed to be having a staring contest with the giant nipple.

“Wait, my nipples aren't that big normally, are they?”

She, too, popped the nipple out of her mouth and inspected it. It was indeed larger than usual, and was getting larger before her eyes.

“Is this normal for you, Princess?”

“Uhh... I can't say it's happened before.”

They continued to swell until they were roughly as long as a golf ball is in diameter. They protruded from each breast a little over four centimetres and were just over half as wide. Celestia felt a throbbing deep within each breast, as if something was building up. Her breasts swelled a little, just enough to be noticeable, and even the areola of each breast filled out and raised marginally.

She experimentally squeezed a breast; a white jet of milk blasted from the nipple, about as thick as her little finger. It sailed over the shoulder of a surprised Rarity and splashed against a window fifteen feet away.

“Okay, that's new.”

Enraptured, Rarity seized the nipple once more and thrust it into her mouth. Squeezing the breast with both hands, causing Celestia to moan noisily, she was rewarded with a powerful spurt of milk that filled her mouth. It was just as thick and creamy as full-fat milk and just as, if not, tastier. She kept squeezing and milk kept filling her mouth. Celestia was in bliss; it felt like an orgasm in her chest. After half a dozen mouthfuls Rarity pulled away, milk running down her chin and dripping onto the wooden floor. She gave a satisfied sigh before looking up at Celestia.

“Gosh, I don't know what came over me. Sorry.”

“Don't apologise! That felt fantastic.”

She bent slightly and gave Rarity an unintentional bear hug, her huge tits smothering her face.

“Whoops! Guess I don't know my own strength. My turn to be sorry.”

She drew back and frowned.

“This is a little unfair on you. How about I return the favour?”

Rarity's eyes lit up at the prospect of having her nipple suckled by the Princess of all people. But she recognised the notable height difference between her chest and Celestia's mouth.

“That would be wonderful. But I'm a little short, aren't I?”

Celestia, now standing with her arms folded beneath her bosom, giggled.

“How about we go upstairs and lie down? That should make things easier.”

Rarity liked the sound of that. She wiped the milk from her chin with her arm and, grinning like a little kid on Christmas day, led Celestia upstairs. On the way up, the Princess got a first-class view of Rarity's rather impressive rear bulging out from the bottom of her slip dress, which she eyed with hunger.

Turning into the bedroom, Rarity stripped and threw herself onto the bed, eagerly awaiting the tender touch of the Princess. Celestia finally removed her panties revealing a perfectly-formed, if larger-than-average vagina. Rarity was taken aback by its size, and was sure it could easily accommodate two of her own toys. It seemed the Princess was well-endowed everywhere.

Celestia climbed onto the bed, her pendulous melons swinging hypnotically. She clambered over Rarity and lowered herself, squishing her huge tits against Rarity's own chest. Their nipples touched and both flinched at the orgasmic sensation; Celestia leaned into her and kissed her passionately. Each was pleasured by the sumptuous softness of the other's lips, and their tongues met and entwined as they closed their eyes and descended into the depths of pleasure. Celestia felt her large, swollen labia grinding against Rarity's spongy thigh and moaned into her mouth. She was already getting rather wet with the intensity of their engagement, the moisture allowing her to slide her sex up and down her lover's leg with increasing proficiency.

Rarity reached out and grasped a handful of royal booty, finding pleasure in its softness and warmth. The sheer size of it still wasn't lost on her. Celestia giggled mischievously and broke the kiss, staring intently into those deep, shimmering eyes. Rarity gazed back, noticing for the first time just how beautiful Celestia was. Without warning Celestia took Rarity's nipple into her mouth and gave a strong suck. Rarity nearly fainted in ecstasy as her nipple was stimulated like never before. Slowly, surreptitiously, Celestia slid two fingers into Rarity's dripping pussy and twisted, eliciting a cry of pleasure from beneath her.
“Oh gods!”

Rarity's eyes rolled into her head as Celestia pushed deeper, adding a third finger.

“So... close...nm..”

Rarity began whimpering in time with Celestia's hand thrusts until she reached a riotous climax.

“YES! Oh YES!”

She uttered a long, low moan as the Princess slowed down. With an open-mouthed smile, Rarity pushed her head back into the pillow and ran her hand through Celestia's velvet hair, who slowly withdrew her fingers which were now coated in a thin layer of love-juice. Rarity gazed at her as she painstakingly ran her tongue along each finger, smacking her lips when she was finished.

“Wow, you taste good.”

“Mm, I'm glad you approve, your Majesty. Will you allow me the honour of doing the same for you?”

Celestia extended a hand, which Rarity took, and she lifted up off the pillow.

“Of course dear, the pleasure would be mine. Let's switch places.”

Celestia gently lowered herself onto the pillow, nuzzling her chin into her cleavage as she did when she was alone and savouring the welcoming texture of her soft breasts.

The Princess lying on her back was a sight to behold. Her dazzling kaleidoscopic hair was splayed across the pillow framing her heavenly visage, partially obscured behind her mountainous boobs capped by large, erect nipples that still held traces of milk from their earlier escapades. Her soft, wide midriff was flanked by her broad, full hips that rested atop her thick thighs.

So thick and full were Celestia's thighs that she had to spread her legs to allow Rarity to access her vagina. Once this was done, Rarity wasted no time. She hooked her arms round Celestia's waist and dove in, massaging the large, sopping folds with her dexterous tongue. Almost immediately the Princess' back rose off the bed as she practically convulsed with pleasure. But Rarity held on tightly to her waist and pushed further in. She seized the opportunity to target the big, throbbing clitoris and squeezed it between her lips, causing Celestia to gasp aloud before gritting her teeth as Rarity carefully nibbled her clit.

Rarity bit a little harder and Celestia quietly shrieked and reflexively squeezed her udders, sending twin streams of milk up into the air, splattering on her stomach.

“Getting... unf... close!”

Hearing this, Rarity increased her efforts, licking, sucking, kissing without rest.

“I should oof... probably... nn... mentioned that I'm quite aaaaaah... a squirter - OH!”

Rarity didn't quite have time to process this, Celestia was suddenly racked by an immense orgasm that sent tingles throughout her whole body. She felt a tightening in her core as she climaxed, and a gush of warm juices filled Rarity's mouth. She swallowed one mouthful and then another, before withdrawing, panting noisily, juices dribbling from her lips. Celestia clenched her fists and groaned as she delivered a final gush of fem cum that soaked the bed sheets. With that, Rarity gently collapsed beside the Princess, and with the afterglow leaving them feeling calm and content they gradually drifted off into sleep in each other's arms.

It had just hit noon when they awoke, Celestia a few minutes before Rarity. Initially they couldn't remember why they were laying in the nude together in bed, but soon memories of their exploration of each other's bodies and the intimacy they had shared returned.

After dressing, Rarity promised Celestia that she would begin work immediately on a whole set of clothes for the Princess that would fit her comfortably. They thanked each other for the wonderful experience they had shared, and Celestia departed, leaving Rarity alone once more.

She flopped into the arm chair and reflected on the past few hours.

“Well, that doesn't happen every day.”

Bigger Things (Twilight x Spike, breast & penis expansion)

"Mmmmnnn... Ohhhhhhhh..."

Droplets of milk trickled down the curve of each breast as jets of cream squirted out of each nipple, while poor Twilight convulsed and shuddered. It felt like her tits were overfilled and couldn't empty themselves fast enough, with the backlog creating a pressure build-up that felt both painful and deeply pleasurable. She resorted to enclosing one over-inflated teat in both hands and squeezing it between them, like pumping a bellows. She gritted her teeth as the milk shot out at an even higher velocity, nearly reaching the ceiling 10 feet above her bed. But still the pressure was unbearable! There was only one thing she could do.

"Ohhhh gods! Spike! Spiiiiiike!"

Spike, who had been crashed out on his bed for the best part of the day, slowly opened his eyes, yawned, stretched, ruffled his shock of mint-green hair, then sat up.

"Ugh. Coming, Twilight!"

He had noticed strange changes in Twilight's body. Gradual, but definitely there. So gradual that Twilight didn't notice until Spike mentioned it. Suddenly it became obvious why her clothes had been getting tighter. What they didn't know was this was all happening because of Twilight's recent transformation into a princess. She was inheriting the hyper-fertility shared by all Equestrian royalty which Twilight had only recently discovered through literary investigation. When the growth didn't show any signs of stopping she got worried and wrote to Celestia.

Spike tried to feel sympathetic but it was hard to ignore how incredibly sexy Twilight was becoming, a girl that wasn't exactly unattractive to begin with. Being a young adult of 21 and having been hit very hard by puberty, all he could think when he looked at the super-curvy Twilight was "Must. Not. Get. Hard."

It was difficult for the well-endowed Spike, who had always been 'big' for his age, to hide his feelings for Twilight, but now when his 12-inch hard on was almost constantly bulging against his pants around her it was becoming embarrassing. Twilight made sure that he never saw her looking, but lately she was feeling severely over-sexed. What she really wanted was to have her pussy stuffed with that thick pillar of meat but she was far too timid to even hint at her desires. Despite her shyness her libido was rising faster and faster, it was only a matter of time before she lost all inhibitions and pounced on her assistant: all twelve inches of him.

Spike muttered to himself as he shuffled groggily down the corridor to Twilight's room.

Jeez, what's the idea getting me up in the middle of the day? This better be important.

"I deserve a lie-in tomorrow Twilight, 11AM on a Sunday? This is unbearable! What's-"

As he walked through the doorway he stopped and stared at Twilight's fidgeting form splayed out on the bed. Her toes were curling and uncurling, her head was rolling on the pillow, and her little hands were pumping her over-inflated tits. She managed to notice Spike through her haze of lust and her magenta eyes lit up.

"Ah, there you are my little..."

She noticed the growing bulge in Spike's underwear.

"...big assistant. I need you, and I'm not taking no for an answer."

Spike pulled off his shirt and threw it away.

"Neither am I!"

Nearly stumbling in his mad rush to reach Twilight, he landed on the foot of the bed.

"Woah there big boy, wait a minute."

"I'm not sure I can..."

He looked down and Twilight followed his gaze. There was a growing damp spot forming on the tip of his length as pre began to ooze out of his semi-boned dick. Twilight giggled and pressed her foot against Spike's crotch. He gasped and moaned simultaneously as her cute little toes pressed against his sensitive flesh.

"We don't want your little friend going off too soon, do we?"

"Ungff... mmnn.. No, Twilight."

"Good boy."

She lifted her foot off and Spike's junk re-filled the available space, straining against his boxers.

"I'm pretty sensitive up here at the moment, so try and show a little restraint, Spike."

He eyed her taut globes longingly, entranced by their size and majesty, and responded after dragging his eyes away from them and moving his gaze up to Twilight's stunning visage, which he judged was just about as fantastic as her chest. And seeing as Spike was a hormonal young man with a keen interest in breasts like many males of his age, that was saying something. From her well-defined jawline to her cute button nose and sparkling purple eyes, she oozed sex appeal. And of course, being Twilight, she was completely unaware.

"Okay Twilight. I'll be careful. What's going on with you anyway? I didn't wanna say anything but you've... changed?"

She had. Ever since she had been crowned a Princess and Celestia's hand had touched hers she had felt something. A sense of mental clarity, of enlightenment, but also in the deepest, darkest recesses of her mind a sexual hunger. The seed of her hyper-fertility had been planted, and now, like with Celestia, it was awakening.

"It's hard to say exactly, but I've been in touch with Celestia and it must be something to do with my transformation into a princess. It seems the changes weren't just to my role in Equestria. It involves some sort of innate power of fertility that goes right back to the earliest days of the history of these lands. The Equestrian royal family isn't just there to look pretty, we have powers too. The power to provide and maintain life in Equestria through reproduction. It's not really much use these days but it's still a part of us and we can't exactly switch it off. The best we can do is to stay chaste and let it lie dormant. There's no telling what we'd become if we unleashed these powers. Although I do have some idea..." She looked down at her expanding bust. "...And I must admit, I'd like to find out."

Spike's mind, clouded with desire, struggled to take in Twilight's speech. He was clearly thinking about other things, which became obvious to Twilight when the tip of his penis began poking over the waistband of his boxers. He looked up, smiling timidly and blushing.

"Oh, Spike. Let's get you out of those undies."

As she pulled the boxers down, the head got caught in the bunched-up fabric. When she peeled the fabric off Spike's length it sprang back up, flicking flecks of pre across her face. She reeled back laughing and removed each little blob with her finger before licking her digit clean.

"Oo, somebody tastes good. I can't wait to sample the real thing."

She cradled his large balls in one hand while caressing his length with the other. Spike could only clench his fists in his lap and savour the sensation of Twilight's soft, velvety hands massaging his member. Beads of pre began rolling down the stiff pole as the head flared.

"I'd better stop before you blow, we haven't even started yet!"

Twilight laid back and gestured for Spike to come over. He crawled over to her and gently laid in top of her, hands wrapped around her upper body. His dick wedged itself between her meaty thighs and they locked lips, eyes closed and tongues dancing. Twilight broke the kiss.

"I almost forgot why I brought you in here. The pressure in my tits is getting unbearable and I need a big, strong man to help me..."

Spike sat up while Twilight played with his manhood. His eyes fell once more upon Twilight's expansive bosom.

"You want me to get the milk out?"

What a way with words he has.

"Yes Spike."

He cupped her left breast and found he couldn't being his hands together, this really was a big boob. He latched onto the fat nipple and started sucking hard while groping the breast flesh. Twilight's mouth opened in a silent scream as she experienced a sensory overload. Spike was taken by surprise as a burst of thick cream filled his mouth, bulging out his cheeks. He swallowed quickly and his mouth was filled again and again. He kept this up until he felt his stomach filling and slowly released his grip on the monster boob. He needed to save some room for the milk in the other one!

He pulled off and the suction broke with an audible *pop*. Without wasting any time he cradled the other boob, locked his lips over the nipple and sucked. Again, Twilight's eyes rolled up into her head as she held Spike's head in her hands and gritted her teeth. After half a dozen mouthfuls Spike was full and he let the nipple go, rolling off of Twilight and laying next to her.

"Thank you Spike, I thought my tits were going to burst! Looks like you still need to get off though."

Spike's dick was indeed still hard, but it looked a little turgid, as if it was trying to grow. What neither of them realised was the milk Spike had just ingested was no ordinary milk, but was laced with Twilight's unique genetic make-up which passed her powers of hyper-fertility onto the recipient of her emissions, in this case Spike, and would turn him into a being of pleasure and sex just like the Princesses. Being male, naturally it effected him differently. His testicles and penis would see the lion's share of the changes, and the increase in hormones would build muscle mass and increase libido, all with the purpose of turning him into a reproduction machine.

Spike was paralysed with pleasure as the changes overcame him. Twilight tried to rouse him.

"Spike? Are you okay? Woah..."

She sat, wide-eyed, as his cock began to lurch and swell. She timidly extended her arm and reached out with her hand. Just as her fingertip met his length, it blossomed upwards and outwards. She withdrew her hand and gasped as Spike's cock fattened and lengthened, inch after inch adding onto its height and girth. As it grew, his balls, apparently eager to catch up, swelled and churned, filling the space between his legs and pushing them apart. His muscles gradually became more well-defined; chiselled abs and sizeable pecs emerged from a previously nondescript torso and tennis ball-sized biceps rose from his enlarging arms.

His cock's growth began to slow as it reached the two foot mark, and his balls lurched one more time, just reaching the size of volleyballs. Now seven feet tall and hung like an oversized horse, Twilight wanted to take him for a test ride.

Spike gradually came down from his sudden sexual high. He opened his eyes and found a towering pillar of cock rising above him. He didn't realise it was his until he reached out and grasped it. As soon as his fingers met the surface of his enormous dick he was flooded with waves of pleasure. He tried to question all this; the hows, whys and whens, but all queries evacuated his mind when Twilight gripped his cock and squeezed. He cried out as a rope of pre spurted from his broad cockhead, sailed back down and splattered against Twilight's arm. Twilight wiped off the cum and stared at the gooey substance adhering to her fingers. Her sharp mind began racing.

My milk contained something that made Spike grow... a lot. Perhaps whatever he has in his balls now will have the same effect on me. Maybe then I'll be able to fit that huge dick in me.

Eager to investigate her theory, she wasted no time in kneeling in front of Spike and engulfing his meat column with her tits. She pressed her huge globes of flesh together and began sliding them up and down the area of his length that she could reach. There wasn't any need for lube as his cock was already slick with the seemingly endless supply of pre that spurted out every few seconds.

"Looks like I made you big and strong with my milk, Spike. Maybe your cum will make be bigger too, then I can get this beast inside me."

Spike tried to say "yes" but all he managed was a guttural moan as Twilight began pistoning her arms up and down and massaging his ultra-sensitive cock meat with her soft, doughy fun bags. Before long the veins along its length began to flare up and the head began to swell. He was about to blow!

Twilight sat up and, with a little difficulty, managed to get his whole head in her mouth. With a few double-fisted pumps, Spike went over the edge.

A thick rope of spooge blasted into her mouth, almost making her gag as it splashed against the back of her throat. She regained her composure and swallowed just in time for the next shot which once again filled her mouth to the brim. Spike was groaning loudly and holding his cock at the base as all the muscles in his groin contracted, sending buckets of spunk out of his balls, up his length, between Twilight's tits and into her mouth.

After ten mouthfuls Spike was still going strong and and Twilight pulled herself off, gasping for air. His cock continued to convulse, and the next rope rocketed out of his tip and into the air, coming back down all over Twilight's face as she looked up to watch it. Unable to resist, Spike pushed his rock-hard dick downwards and aimed it at Twilight's surprised, sticky face and let her have another blast of cum, and another, and another. After nearly twenty ropes he was done, a little bit of spunk still oozing out of the tip and rolling down his length. Twilight was plastered with jizz, most of it hitting her in the face or the upper chest. She smirked at Spike and began to wipe down her face with her arm. She scooped up a few handfuls of jizz and greedily swallowed it.

"Jeez, you really put out now. I need to clean myself off."

She stood up, rubbing her eyes, and turned. As her vision focused she noticed a tall figure standing in the shadows by the door.

"Goodness, who'd have thought my student was so good at giving head?"

Larger than Life (Spike x Twilight x Celestia, breast/butt expansion, penis expansion, hyper)

"Princess Celestia!"

Here she was in all her glory. She was very much dressed down for the occasion, with a simple white tee and jogging pants. Not very regal, she admitted to herself, but she very much hoped that this would prevent attention being drawn to herself. It did for a time, but when passers-by realised who she was and how much she had changed, all they could do was stare. Whether she was coming or going her body was a sight to behold, not least in casual wear that offered little support and let her assets bounce around unhindered.

With her last growth spurt brought on by Luna, even her baggiest clothes clung lewdly to her expansive curves. After ripping her last pair of yoga pants while exercising in the gym, she moved up another two sizes just to be safe. But now, even those couldn't fully contain her monstrous booty, and a little bit of butt cleavage spilled over the waist band. Her huge hips, now 61 inches around, and 28 inch thunder thighs tested their strength too. It had taken her nearly a minute just to get these pants on at all; she had to get a firm grip on each side and tug them up and over the gigantic projection of her globular ass that proudly stood out a foot and a half from her back. Despite its size it hadn't lost any sensitivity. She could feel it wobble and sway with each step she took. Every hundred yards or so she had to stop and yank her pants back up as her ass would keep trying to escape from its cloth prison. She was also still unintentionally masturbating when she walked as her bulging thighs pushed the material of her pants against her oversized clit with every step.

Ever since her most recent growth spurt her libido had been on a hair trigger. On her way out of the castle to visit Twilight, Luna slapped her rear as she walked past and she nearly came!

"How do you even fit that fat ass in anything?"

"Do you want me to sit on you again?"

Luna gave the soft flesh of her sister's giant butt cheek a good squeeze, eliciting a quiet moan from her.

"Actually I'd love to have this thing on top of me again."

"Oh, I'm sure you would. Maybe later, I have to see Twilight."

She kissed Luna on the lips and then made her way down the corridor.

"Don't try sitting on her, she's only little! She might get lost in that thing!"

Celestia turned and furrowed her brow in mock offence, suppressing a laugh.

"You'll pay for that later!"

Spike hungrily eyed all 7 foot 3 of her and felt his heart rate rise, globs of pre streaming down his rod of steel. He couldn't wait to blow a huge load all over her.

It was obvious that she had grown quite substantially, as her 3XL shirt barely covered her navel, her enormous jugs contained inside an equally enormous red bra that showed through the thinly stretched fabric of her top. If she puffed out her chest her weapons of mass destruction would likely tear it open.

Twilight knelt and attempted to bow down but her oversized tits squished against her knee and got in the way. Celestia had to admit that it wasn't every day she met with a naked, cum-covered subject, but it didn't strike her as something she wouldn't want to experience again. Spike sat up and was going to do the same as a Twilight but Celestia stopped him.

"Thank you Spike, but I can see you're already standing to attention."

Indeed, his two-foot dick had fully re-inflated at the sight of the super-voluptuous, beautiful sun goddess. He hadn't seen her for some time and it came as a very sexy shock to see how... big she had gotten. Celestia, in turn, was taken aback by the size of him and Twilight.

"Looks like you two had a good time. Have you always been this big?"

She enclosed a hand around Spike's pole, which by now was flying proudly at full mast once more, and applied pressure.

"Hnnhhh... N-no, your majesty."

She relinquished her iron grip and wiped up the pre bubbling from the tip. Like her own milk as of late, it was a striking alabaster white and almost seemed to glow. She sucked the glob off her finger and appreciated the flavour and texture like she would a fine wine.

She swallowed, and enjoyed the sensation of the velvety cream rolling down her throat. Almost immediately her nipples hardened and distended slightly. She stared wide-eyed at the protrusions in her shirt, then back up at Spike and Twilight.

"Heavens, what did I just swallow?"

Twilight stood up, her boobs wobbling back into place.

"We think, your majesty, that this all has something to do with that hyper-fertility you told me about. It made me bigger, and as you can see, I passed something along to Spike. I consumed some of his... uh, semen... in the hope of replicating this effect in myself. For science, of course."

"And so you can fit my dick inside yourself."

"Yes, that too, Spike."

Celestia sat on the bed beside him.

"I see. I wonder if I could also provide him with a little extra mass."

She grasped his length again and slowly raised and lowered her fist along it. The feeling of his foreskin bunching up and rubbing against his head was eye-wateringly pleasurable. What a day this had been, not only had he grown a huge dick but princess Celestia was jacking him off!

"Gonna.... cum..."

"Gosh, so soon? I'd better stop, we don't want you blowing before we've had a bit of fun!"

She retracted her hand and began to lift her shirt off. Slowly but surely her vast chest was revealed, two pumpkin-sized orbs of flawless, supple flesh trying to force their way out of an undersized M-cup bra. Flesh was oozing out everywhere; underneath, along the top and out of the sides. Spike couldn't decide whether he'd rather motorboat them or paint them white. He'd have to wait, though, because they were interrupted by Twilight.

"Uh, I think something's happening."

They both looked over at Twilight, naked except for her purple panties, cradling her big bosom in her hands. It seemed Spike's supercharged load Twilight had guzzled down was now taking effect. Celestia shuffled back and sat against the headboard beside Spike, nonchalantly playing with his junk.

"Now this I must see."

Twilight was a little embarrassed by the fact she had an audience, but any feelings other than lust and pleasure soon dissipated as the sensation in her chest peaked. She gritted her teeth as her areola swelled and her nipples distended, doubling and then tripling in size. She began to creep upwards in height, the floor creaking as her weight increased. She looked over her shoulder to see her ass cheeks growing and extending out from her back. She widened her stance as her thigh gap disappeared, filled with soft flesh, and her hips rounded out into near semi-circles.

"Fuck, that's hot."

Celestia had been idly stroking Spike's dick as she watched the show. Her other hand had disappeared between her thighs as she slowly fisted herself. By now Twilight's tits had reached her navel and looked fit to burst. The only thing holding back the flood of milk was her nipples, and they wouldn't stay closed for long with the weight of her payload pushing against them. She felt the tension in the room rise as Twilight leaned back against the wall to support herself, moaning almost nonstop as the inevitable climax approached. Celestia turned to Spike and they gazed at one another briefly before looking back at the groaning Twilight.

"Shit! Oh shit, shit, shit!"

Reflexively she compressed her grip against her teats as they reached maximum capacity. Celestia grinned.

"Here we go."

Suddenly the flood gates opened. Twilight's six inch-long nipples opened wide and unleashed a salvo of cream that splattered against her two companions, the bed, and the wall above them. Both Celestia and Spike caught several mouthfuls of the divine nectar as Twilight blasted them again and again.

"Mmnn... Fuuuuuck yessss......"

Twilight continued spurting out jets of cream, head tilted back, eyes closed, her face a picture of sheer bliss. She felt like she was cumming from her nipples, and that wasn't far from reality. The feeling was too much. She cried out as she orgasmed, spurts of femcum running down her legs and pooling at her feet. After three minutes, the gushing jets began to weaken. The streams drew closer and closer to their source before they became a trickle, then silence fell as the last droplets of milk dripped onto the carpet.

The area in front of her had become a sea of white. Thick, creamy milk coated most of the far wall, not to mention the two dripping figures on the bed. Spike licked his fingers clean.

"That... was awesome."

Physically drained, Twilight slid down into her knees and the weight of her breasts pulled her forward. They broke her fall and spread out across the floor, she put her arms down either side of them, smiling.

What they didn't know was they were creating a feedback loop inside themselves. Each time a hyper-fertile substance was ingested, then expelled and ingested by someone else imbued with hyper-fertility, its potency doubled when it was expelled again, a quirk designed to help rapid repopulation with very few individuals. Spike was about to learn this first-hand.

"And you think I put out, that was crazy!"

"Spike's right, that was incredible."

Twilight replied, her voice muffled by the carpet.

"I came so fucking hard."

Feeling a little more stable, she rolled over and sat up. She cupped her big bazongas in her hands and giggled.

"I could get used to these."

Spike noticed he was getting harder. But not just that, he was getting bigger too.

"Looks like you're making me bigger again Twilight. Fuck, I wanna cum so bad."

As he groaned his cock began to distend and lengthen. His balls churned and fattened as they grew even larger, filling up with what would be a truly epic load. In one long, agonisingly pleasurable spurt his cock grew past the three foot mark and began to tilt towards him under its own weight. Soon he'd be able to suck himself off. His body tried to keep up but it was clear that his cock would be disproportionately large, like the boobs on Celestia and Twilight. They were essentially turning into living, breathing sex machines so it made sense.

As Spike's muscles filled out he began to resemble a very well-built bodybuilder, with well-defined abs, thick slabs of meat for pecs and muscles bulging up wherever there was space for them. As his biceps reached 23 inches around it began to get difficult to bend his arms, but his strength was immense. He was worried that if he got a little too rowdy while jerking off he'd hurt himself but as he watched the length and girth of his member increase it seemed less and less of a problem. As his second growth spurt wound down, his dick stopped at just over four feet in length, and he was nine feet tall. Now his legs below the knee hung over the end of the bed and his feet almost touch the floor. His fully-boned cock would brush against his ankles if he could manage to bend it down that far, but it was far more inclined to point the other way. The angry pink head was now staring him in the face, the seemingly constant trickle of pre gathering between his pecs. he could just about lick the tip with his tongue, and considering the size of his pectorals he could probably get himself off between them.

"Jeez, I feel like I'm gonna blow any minute. This pre won't stop."

Twilight could see that his huge, taut basketball-sized testes resting against his thick muscular thighs were very turgid and practically full to capacity.

"I'm not surprised," declared Celestia, "you look fit to burst down there. With the load in those balls you could fill a five-gallon bucket. Actually, I think I could too."

She looked down at her chest; Twilight had made her grow too. In all the excitement she hadn't taken her bra off and her jugs had ploughed straight through them, the tattered remains lying either side of her. She was ten feet tall now, but just like Spike, her body wasn't in proportion, her boobs covered her upper torso and she struggled to bring her hands together in front of them. They were still very soft, if anything they'd become softer, and she could push her hands into them as if they were made of memory foam. She could feel the milk inside them as she rolled the flesh across her hands. Her hips were wider than ever, one was pushing against Spike and the other was hanging over the side of the bed. Twilight moved towards them, hips swaying and boobs bouncing.

"You both look incredible... but I have to get my hands on that dick."

As she put a knee down on the bed, the inevitable happened; her bed finally gave up and collapsed under the weight of the three huge friends. Luckily the floor beneath didn't give way too. They all burst out laughing, and adjusted to the lower perspective. Twilight wasted no time and got back to her objective: Spike's pork sword.

"Dammit Spike, you're too big again, when am I gonna get to ride this thing?"

"Hey, it was your decision to aim your tits at us!"

Celestia laughed and stood up.

"Sorry Twilight, looks like he's a little too big for you. But I think I'm just the right size for him. No hard feelings."

She gave Twilight a consolatory peck on the lips which quickly turned into a full-blown French kiss, they really had become slaves to desire.

Spike, meanwhile, got his first real look at Celestia's ass as she stood in front of him and made out with Twilight. The only word he could think of to describe it was huge. It must have been a metre across and stuck out from her back at least half that distance. Her hips seemed outrageously wide from the front, but now he saw why: they framed a truly colossal butt. It was amazing how rounded the cheeks were, her rear resembled a toned bubble butt, but meatier, wider and on a much larger scale.

Each cheek seemed to push against the other in the fight for space, and there was an obvious cleft where her thick thighs met the underside of her rear. Even better, Twilight's hands had made their way down to it, and Spike had a front-row view of this perfect ass being kneaded and groped. It was almost too perfect the way the mass of flesh flowed in her grip and spilled out between her fingers. He was so turned on that he nearly came, but he just managed to pull himself back from the edge. A small string of cum did escape, however, and splashed against her beautiful booty. She raised an eyebrow and looked down over her shoulder. Resting on the shelf of her expansive ass was a little pool of viscous goo, and the guy responsible was down below her, smiling sheepishly.

"Spike, you naughty thing. You almost finished without me."

She wiped off the goop with her fingers and fed it to Twilight, who hungrily licked it off her fingers.

"I'd better cast an anti-impregnation spell, there's no telling what would happen if I didn't."

A faint yellow glow shone across her belly and then faded.

"Now, let's get to it."

She squatted over the immense pole and guided it into her sopping cunt with both hands. With a little push she swallowed the entire length inside herself and came down onto Spike's hips. Celestia was on cloud nine; she had managed to fit the whole length inside herself but it was a very snug fit. The feeling of that hard, thick meat pushing against the walls of her pussy and filling her so completely was heaven.

"Ready, dear?"

Spike nodded, sweat beading on his brow. He rested his hands on Celestia's huge, soft hips.

"Here we go."

She slowly raised herself up, the when she was three quarters of the way up his length, she slammed herself down again. Spike groaned noisily and his head raised from the pillow subconsciously. She paused and squirmed on his cock, revelling in the feeling of being so very full.

Spike was nearly passing out. Not only was the entirety of his immense cock stuffed snugly into the royal Celestial pussy, his balls were firmly sandwiched between his own thighs and a big, fat ass.

She carried on, raising up, then slamming back down. She quickened the pace, causing her massive breasts to jostle and jiggle. Beside them, sitting in a chair, Twilight was furiously getting herself off. The fingers on her right hand were a blur, slipping in and out of her nethers, slick with juices. Her left hand was twiddling her bulbous clit.

By now, both Celestia and Spike were dripping with sweat as they fucked with abandon, Spike squeezed into a tight passage and Celestia stuffed like a turkey. A messy climax was fast approaching. Spike cried out.

"Ohh fuck, I'm gonna cum so fucking hard!"

Hearing this, Celestia redoubled her efforts, leaning forward and letting her gargantuan melons flatten against Spike's ripped chest. Putting her hands on his shoulders, he began thrusting upwards and penetrating deep into her. Twilight could take no more and her insides turned to jelly as she climaxed, spraying femcum all over the floor beneath her.

Spike thrusted faster and faster, his meat rapidly sliding in and out of Celestia's puffy labia, a mixture of both of their juices coating his dick.

"Fuuuck!"

They virtually came in unison, Celestia a few seconds before. As she climaxed her pussy convulsed and clamped down on Spike's cock which instantly pushed him straight over the edge. A thick, steamy jet of cum rocketed up his length and blew out her stomach a few centimetres. Spike was cumming in one long stream, the duct inside his cock trying desperately to keep up with the endless supply of cum being blasted out of his balls. They moaned and groaned as their orgasms went on and on, Celestia whimpering and holding tightly onto Spike as he kept his dick wedged in her, filling her with his potent seed.

After half a minute of nonstop cumming, Spike was done. He brought his hips back down and Celestia laid on top of him, his deflating meat disappearing between her thighs.

Outside, in a nearby tree, a figure with binoculars was watching through the bedroom window.

"Yes... Enjoy yourself, my dear Celestia. Soon you'll be so engrossed in your sexual endeavours, you'll have neither the desire nor the ability to stop me. Chaos will reign once more!"

A Means To An End (Spike solo, Celestia x Discord, hyper/macro growth)

Twilight awoke on the remains of her bed, which had been broken following their sexual ordeal earlier, and sat up.

“Wow. That was a day I won't forget fast. Celestia? Princess Celestia? Spike?”

She called out inquisitively, remembering distinctly that the Princess and Spike had indeed been here earlier. Planting her feet on the floor next to the bed, which now lay at floor level, she uneasily stood up, and felt an unfamiliar weight on her chest.

“Oh! I forgot about you two.”

She felt the weight of her oversized chest in her hands, the abundance of flesh filling her grip. Twilight had never been particularly well-endowed, but now she was bigger than Celestia was before she started growing. Her cherry-sized nipples sat erect atop semi-spherical areolae, as if they were struggling to hold back something.

“I'd better not squeeze these, I might go off again, Well, better find something to wear. If anything still fits...”

She walked over to her wardrobe, noting the weight of her new assets, upper and lower, and rather liking it. Opening the doors, she scanned for anything that she'd actually be able to get on, let alone fitting properly. She was pretty certain that none of her underwear would even get past her thighs, never mind her hips.

“Ah!”

She spotted something she hadn't worn in a very long time, a pair of black spandex leggings. Before she arrived in Equestria, she was a little soft around the edges. Determined to shape up before meeting royalty, she took up jogging for a few months prior to leaving for her new home. She managed to shed the excess weight, and the leggings disappeared into the dark recesses of her wardrobe, never to see the light of day again. Or so she thought. She took them out and held them up in front of herself.

“I never thought I'd wear these again. Well, it's either this or nothing.”

Stepping into the leggings and bending down, she began to tug them up her legs. Pulling with all her strength, she managed to force them up and over her large ass, although a little butt cleavage was still visible at the top. A victory nonetheless as far as she was concerned.

“Shirt... shirt... uhh...”

The best option seemed to be what would have once been a loose-fiting pyjama top, but it wouldn't be loose any more. Getting it over her head and shoulders was no big deal, but her boobs put up a fight. Eventually though, the twin peaks were conquered, and she managed to cover them completely. Giving herself a brief once-over in the mirror she had to admit that it wasn't a particularly stylish look, but it was infinitely better than just using her hands to keep herself modest.

She turned to the side and grabbed a handful of her protruding rear.

“I just hope these leggings hold out. They're reaaally tightly packed.”

She gave them another yank for good measure, but all she managed to do was set her ass cheeks into a wild frenzy of jiggling.

“Looking good Thighlight!”

Twilight turned, seeing a grinning Spike sat up and holding his steadily inflating meat.

“Wow... uh, ahem, as much as I'd love to, Spike, we need to work out what's going on here. Do you have any idea how much we've changed in the last few hours? Something isn't right.”

She tried to fold her arms across her chest, forgetting her enlarged bosom. She looked down and folded her arms again beneath it. Looking up again, she noticed a letter on the bedside table. Picking it up, she read it aloud quietly.

“Twilight,

Thank you for the wonderful time today, I'm still replaying it in my head and wishing we were still spending time together. I'm sorry that I dashed off without saying goodbye, but an old friend got in touch and offered me a good time. No one can pull my strings like he can, so I couldn't refuse, especially with how wound up I am. I must have been pushed over the edge half a dozen times by Spike or yourself, but I just had to have more. Thank goodness he got in touch when he did, I didn't want to wake either of you up!

By the time you're reading this I expect we'll both be in my chambers at the castle, do come over and visit us. The more the merrier!

Love,

Tia”

Twilight put the letter down, feeling a stirring in her loins.

“Gosh, Celestia never talks about sex. Not like this anyway. What's got into her? And what's got into me?”

She gave herself another once over in the mirror. After a pause, she noticed a pressure growing in her crotch, rubbed it timidly, and winced with pleasure.

“Hm. Maybe I should go over there. Wouldn't want to miss out on the fun. Dammit, there you go again. Get a hold of yourself. Spike, I'm going to see Celestia to sort this mess out. Are you coming or not?”

“Nah, I need to get rid of this stupid boner you gave me.”

“Well, do it in the bathroom. And don't make a mess!”

“I can't make any promises but I'll try.”

Spike plodded off to the bathroom steadying his four feet of dick with both hands. His huge shoulders meant he had to walk through the doorway sideways, holding his length up against his chest. He smiled uneasily at Twilight as he slipped through and closed the door. She just rolled her eyes and made her way out of the bedroom.

If he makes a mess I'm not cleaning it up! Sigh... if only I had the time to ride his big, long...

She shook her head, trying to clear he mind and focus on more pressing matters.

“I can't waste any more time. See you later Spike!”

She closed the door behind her and moved briskly down the stairs, sending her assets into another jiggling fit.

Meanwhile, Spike was having difficulties ensuring he wouldn't make a mess. He was trying to force his rock-hard pole down so his load would go into the toilet bowl, but it was difficult and quite uncomfortable to keep it down at such an angle. He gave up trying to force it downwards, and it sprang back up, flicking pre over his head and onto the tiles behind him.
"Darn, that won't work. Hm."

Scratching his chin, he surveyed the bathroom. By this point, all the stimulation had brought him very close to the edge. Veins the size of shoelaces snaked across his length, while the angry purple head flared and gently pulsated. Every few seconds a drop of pre would leak from the tip and drip on the floor. He looked down at the *plip* noise.

"Note to self, wipe that up before Twi gets back."

He stepped into the bath tub, dropped himself down and squeezed into a seated position, his length stretching up in front of him. He firmly grasped it with both hands, then tugged the shower curtain across. He looked up at the ceiling.

"I know I'm gonna have to clean that later."

He began to slide his large hands along his slick meat, spreading the pre running down its underside. He reveled in the deep, throbbing pleasure that resonated up and down its entirety, his heart rate increasing as he gradually picked up the pace. The soft skin displaced in his grip while the harder spongy center resisted, the friction sending electric tingles of pleasure deep into his being. Like a musical note, each long stroke up or down had a palpable signature that lingered in his member as he gratified himself.

With his left hand, he reached down and cupped one of his huge balls, squeezing it gently and savouring its fullness, finding satisfaction in its immensity.

Already on edge, it wasn't long before he was on the threshold of a mind-numbing orgasm. He began to visualise Twilight's voluptuous form in his mind's eye.

"Oh fuck yes... that big fat ass... unf..."

He imagined himself pounding Twilight's big booty, the soft, velvety flesh rolling in his grip as he forcefully rocked his hips and fucked her senseless.

"Yes... yes..."

His cock head quivered and blossomed ever so slightly as his watermelon-sized nuts clenched, getting ready to send a super-sized load rocketing up his manhood.

"Nnnhhhh..."

He gritted his teeth, tightly closed his eyes and involuntarily bucked his hips as the first rope of jizz spurted audibly from his slit, splattering loudly against the ceiling and raining down over him. Over and over, thick spurts of viscous fluid fountained upward and splashed back down as Spike sucked in deep breaths and groaned, flexing the muscles in his crotch with each salvo.

After half a minute the ceiling above him was painted thoroughly white with several layers of cream, while more splashed against the shower curtain and rolled down into the tub. His midriff looked snowed under as cum dripped down and coated his skin.

The intense orgasm lasted almost a minute, the ropes receding into little spurts like a cherub fountain spitting water. Finally, a few globs oozed from the head and pooled between his legs, joining the rest of the load that had already gathered there. Physically drained, his head fell back and he sighed deeply.

"Fuck, I needed that."

Meanwhile, Twilight had arrived in Canterlot. Fortunately, everything so far had gone smoothly. Her journey to the train station had been uneventful, with only a handful of people glancing at her. Those who thought they had recognised Twilight assumed she was simply a lookalike of Celestia's student on closer inspection. The face seemed strikingly similar, but the body was way off.

Unfortunately, Canterlot was much busier. Twilight was also much more well-known here; the Princess often mingled at parties and events, and she had brought her student along to many high-profile social gatherings.

Everywhere she went, she had at least a dozen pair of eyes helping her along. She followed the gaze of one group she passed, and noticed how their eyes were fixed on her chest as she approached, then moved down to her butt as she passed. It was as if they were in a trance, she could almost feel the eyes following her ass down the street.

It's hard to miss, I guess. What's the matter with these people? Have they never seen big boobs or a big butt before?

But when she caught her reflection out of the corner of her eye in a shop window, she realised why they'd been staring. Her clothes were giving up!

“Oh crap!”

A tear, half a dozen inches long, had slowly been forming between her breasts, the action of just walking and making them bob up and down exerting enough force on the top to rip it open. The fact that she wasn't wearing a bra didn't help; half a foot of pale, bulging cleavage was on full display for any passerby. She looked over her shoulder, and sure enough, there were problems with her lower half too. Held up solely by the curve of her substantial ass, her leggings had been shaken out of place by her butt's wobbling and jiggling, and had slipped downward, now resting on the widest part of her hips. Thankfully they weren't loose enough to fall all the way down, but for the past few hundred yards the top half of her over-sized bubble butt had been hanging out for all to see.

She quickly tugged up the leggings, the soft mass of her butt cheeks bouncing up inside the material before settling back into place with a little jiggle.

I need to get out of here before the entire town turns out to see me...

Glancing around herself, and holding the tear in her top together with one hand, she broke into a brisk walk, sending her ass into yet another fit of jiggling.

“Ahh... my dear Celestia, that was simply divine. It's almost as if you've been practising.”

Discord laid back, arms behind his head on the pillow, grinning smugly. His enormous dick gradually softened, the head coming to rest next to his face. He could change the size of his body parts at will to a certain degree, but Celestia's supercharged milk had taken that ability up a notch or two. She sat on the bed next to him.

“I haven't, honestly! It just seems to come naturally when I'm with you. I don't know about you, but I could go for another round. Maybe two.”

She laid herself on top of Discord, sandwiching his immense cock between her gigantic breasts. He had just managed to squeeze it into Celestia's tight snatch last time, but after another few mouthfuls of the royal bosom nectar there was no way it would fit in again, even with Celestia's own growth spurts. He reached around, grabbed two handfuls of her bountiful ass cheeks and squeezed, making Celestia moan aloud.

Her mind was hazy. Somewhere in her mind there so many questions; so little made sense, but the desire to have sex, to be impregnated, to breed pushed aside everything else. Discord, on the other hand, had complete clarity of thought, and knew what he was doing. He was using Celestia to fulfill what he saw as his greatest scheme yet.

He had tried so many times to bring about a new age of Chaos, but each and every time he had been foiled. But now, his will would be irresistible. Celestia was all but incapacitated, a slave to desire. All he had to do was fill her with his seed, and within hours thousands of his Chaotic offspring would go forth from her womb, spreading anarchy wherever they went. With the powers of their Father combined with the magical might of Celestia, they would be all but unstoppable. For all this to be possible, he actually had to impregnate her. The anti-impregnation spell she had cast on herself earlier before she got it on with Spike still lingered, but if Discord could fill her with enough semen in one enormous orgasm, even the Sun Princess' magic would be overcome. But first, he had to be big enough to achieve that orgasm, and she had to be big enough to fit him.

He was brought back down to Earth from his scheming by a grinding motion along the underside of his length.

Okay, maybe just one more round before I get to work. If anyone deserves a little satisfaction it's me.

Celestia had taken a few handfuls of pre from Discord's basketball-sized cock head that had been leaking like a faucet non-stop and lathered it along his dick, then had begun to slide herself up and down it, grinding her pussy along it and finding the large veins particularly stimulating against her nether regions.

“I appreciate the enthusiasm, my dear, but it falls a little short of proper penetration, wouldn't you say?”

Celestia looked up and raised an eyebrow.

“And just how do you plan on achieving that? The head on your friend here is bigger than the head on your shoulders.”

“Don't fret, I have something in mind. But you'll have to wait and see. For now, I'd greatly appreciate it if you could help alleviate my pent-up lust, I'm not sure I can do it alone...”

Celestia stood up and moved aside as Discord's monolithic mega-dick rose like dough in an oven, standing up like a tree trunk until it was a solid six feet tall, and as thick as a ten-gallon bucket is wide. Celestia looked up, mouth agape, as she absentmindedly fondled herself.

“Wow. Okay. If doing that will get this thing inside me, I'll happily oblige.”

She sat her enormous booty down on Discord's chest, and he wasted no time in groping and caressing the ocean of flesh covering his upper body. After her latest growth spurt, brought on by Discord's two or three loads, her ass was too big for words, it had to be seen to be believed. If he had ten pairs of hands, Discord still wouldn't come close to covering the pair of monster butt cheeks.

Celestia wrapped her legs around the giant shaft, her thick thighs spreading out across its surface, then she pulled her breasts apart and pushed them back together with Discord's cock in between. She began to steadily push her over-inflated fun bags up and down, stimulating the enormous dick between her cleavage. The flow of pre began to increase, rolling down the side and soaking the bed sheets. Celestia too began to leak, cream flowing freely from her rosy, apple-sized nipples and running down the underside of her seemingly never-ending bosom.

She couldn't resist to taste her own milk once more. She grabbed one heavy udder in both hands, folded it upward, and enclosed her mouth around as much of the giant teat as she could. She bit and sucked at the same time, her tit letting loose a rope of cream that spurted against the back of her throat. She reflexively tensed from the sudden sensation, her legs tightening around the base of Discord's huge shaft.

“Ohhh... hnnngg... naughty Princess.”

He slapped her fat ass, sending a ripple across its surface. Celestia uttered a cute little whimper before returning to caressing the mighty meat log with her breasts.

“I, ungh, think you're almost there, your highness. I feel something building.”

Indeed, his pumpkin-sized balls were convulsing and churning, desperate to unleash the gallons of cum that filled them to the brim. It was only a matter of time before the dam broke.

The beast flexed and pulsated, the weighty testes bloating and stretching, and the slit opened wide as it could to make way for the onslaught of cream.

Celestia redoubled her efforts, using her over-abundance of thigh and breast meat to engulf as much as the supersized phallus as she could, rolling her massive melons over it, along it, and around it while her quivering nipples sprayed milk across the bed. With one final compression of her thighs around the base, the huge, taut balls beneath her billowed and clenched and the bowling ball-sized cock head above her flared. Discord planted his hands on her wide hips and gritted his teeth.

"Nghhfffffuck, here it comes!"

He screwed his eyes shut while Celestia looked up expectantly, arms wrapped around the girth of the immense, taut bulk.

With a loud SHOOOM the monster erupted, a flood of spooge blasting from the tip and easily reaching the ceiling before splattering against it. Gallons of thick, hot jizz spurted out in one long stream, a bead of sweat rolling down Discord's contorted face, the sensation of pure unbridled bliss overcame him as his enormous, backed-up nuts emptied themselves of their impossibly large load.

After 15 seconds the first load ebbed. But before he could catch his breath, his fat nuts clenched again, and a second even more powerful jet of spunk pumped up and out of his giant dick, followed by another loud splatter above. Jizz was spraying off the ceiling and coating everything. By the time Discord had finished, Celestia's bedroom looked like a winter wonderland, but with a layer of pearly-white jism instead of snow.

The last few dregs of cum oozed from the shiny head and coated Celestia's hands, still clasped against the shaft.

“Wow.”

She started to lick her hands clean, and almost immediately felt a stirring inside herself.

“That's an experience I won't forget in a hurry. And it couldn't have happened without you, Tia. Thank you.”

She unwrapped herself from the softening shaft and put her feet down on the floor, which was covered by a pool of jizz an inch deep.

“I'm glad you enjoyed yourself, but I haven't forgotten what you said. I'm intrigued to see how you're going to get that thing inside me.”

Discord's softening cock flagged and collapsed against him. He wrapped an arm around it, swung to the side and planted his feet on the floor, up to his ankles in his own seed.

“Look around, my dear. There's enough of my essence here to make you quite staggeringly large, if you so desired.”

He picked up what was an empty glass from the bedside table, now half-filled with a portion of his fluids, and offered it to the Princess. She took it and brought it up to her mouth before tilting her head back and raising the glass. The salty tang hit her, the flavour bitter but not altogether unpleasant. She swallowed and enjoyed the sensation of the warm, creamy fluid sliding down her throat, then tilted her head forward and licked her lips.

“Mm, not bad.”

“You'd better get used to it because you're going to be drinking a whole lot of it.”

“Don't worry, by the time I'm done I think you'll be too small for me, not the other way around.”

Discord grinned lasciviously and waded over to the door, his comically large member resting over his shoulder like a rolled-up carpet.

“Hehe, we'll see about that.”

Celestia looked over her shoulder at Discord, who opened the door sending a wave of spunk out onto the corridor.

“Where do you think you're going?”

“All in good time, Celestia. You just occupy yourself here, and I'll be back before you know it.”

Once again, a niggling part of her mind wanted her to question all of this, wondering if Discord's intentions weren't as innocent as they seemed. But a much larger part of her mind (and growing larger all the time) overpowered reason and reassured her that they were both here to just have a great time.

“You'd better hurry, there'll be no room for you in here soon.”

She followed the outline of her hourglass figure with her hands and reveled in the warm, fuzzy feeling at her core. She could feel that she was going to be huge, and couldn't wait.

“Quite.”

He closed the door again and Celestia heard his footsteps fade.

“Time to get big. Well, bigger.”

She knelt down and leaned forward, her huge udders flattening against the hardwood floor. The feeling of her apple-sized nipples being pressed down by her own weight against a solid floor was almost orgasmic in itself, and she was certain that she had already added some of her own milk to the lake of cum from the stimulation. Some of Discord's load had flowed out through the doorway but there was still enough to make her much, much bigger.

That little part of her mind was whispering again, telling her that laying in a puddle of spunk and gulping it down wasn't the done thing, especially for royalty. But the rest of her brain flattened that thought with a metaphysical mallet, and she began filling her cheeks to bursting with great mouthfuls of seed before swallowing it down. Mouthful after mouthful, and there was still so much more.

“No, not there... no... nope... not here either... uhh...”

Discord was in Celestia's private study rapidly sifting through shelves of bottles, vials and jars in the search for something he'd been meaning to get his hands on for a long time. Just as he was about to give up and search the basement, his eyes fell upon what he was looking for.

“At last! Here it is.”

He gently but firmly grasped the heavy vial with both hands. It was cone-shaped with a large, round base tapering up into a narrow neck. The contents were quite unremarkable as far as potions go; a dull blue liquid. On a piece of paper attached to the glass was Zecora's message to Celestia, reminding her what this potion was and what it did.

With one sip enlarge your hips and rear,
Expand your chest and make curves appear,
Or, if taken by the other gender,
Enhance their muscles and augment their member.
But heed my words, do not goof:
Too much and you'll grow through the roof!

“Yes... perfect.”

A small sip of the potent liquid would add a cup size to a female drinker or a few of inches of length onto the penis of a male, but Discord had his hands on a whole litre.

“With this, I'll easily blast my way through that damnable spell and fill her with my essence. She'll give birth to an army of offspring that'll act and think just like me, and we will be unstoppable!”

He paused, and lowered his raised arms back down to his sides.

“Okay, enough of that. Back upstairs we go...”

By the time Discord had left the study, potion in hand, Celestia had gulped down just over two gallons of the hyper-potent semen. After another half a dozen mouthfuls she lifted her head up from the floor, stood up, and flopped onto the bed. She felt incredibly satisfied, as if she'd just eaten a large meal, and rested her hands on her swollen midriff.

“Damn, that was good.”

The buzzing sensation in her core was growing more powerful. She couldn't help but smile at the familiar feeling.

“Ooh, here we go.”

This time, her hips were the first thing to change. They developed rapidly, curving outward and widening to an incredible size; 'childbearing hips' would be an understatement. Not wanting to be left behind, her ass started to gain mass, thickening and pushing outward, slowly raising her off the bed as it became almost completely hemi-spherical, a bubble butt of truly epic proportions. By now her stomach sat higher than her head as her giant posterior rounded out and extended away from her back. She would have sat higher up if her meaty ass wasn't so soft and pliable, spreading out across the bed cover and racing her hips to the edges of the mattress. Her juicy thunder thighs packed on more meat too, pushing against each other almost down to her knees

Her stomach growled noisily as her body continued to process the seed. Next was her chest; the large teats billowed and quivered as they surged out, taking up whatever room was available on her chest and then spilling down her sides. She held her hands out and giggled as the enormous twins rose up to meet them, forcing them aside and continuing their expansion. By now, her nipples were now out of reach, sitting high atop yoga ball-sized mountains of supple, pristine orbs that sloshed and gurgled with their rapidly increasing payload of royal cream.

“My, my... you two are eager aren't you?”

As if in response, her mammaries seemed to redouble their rate of growth. Her entire body began to radiate warmth as it steadily enlarged. Before long, her feet were dangling off the end of the king-sized bed, and then resting firmly on the floor. She pushed her giant tits together and they squished against each other. Already under a lot of pressure, her melon-sized nipples gaped open, twin jets of warm, creamy milk fountaining upward and splashing against her lower body. Tongue out and panting, she gave herself up to the crescendo of bliss and writhed around as her huge boobs vomited great doses of milk up and out. The wooden floor, still stained with cum, was soaked once again as Celestia's cream pooled on top of it.

The bed was rapidly becoming a sofa as Celestia grew taller, wider and bulkier. Her hips were wider than the 80-inch expanse of the bed, and the pillows would barely cover a nipple. The springs inside the mattress began to warp and flatten under her immense bulk.

Despite its great weight and strength, the solid wooden bed frame began to fracture as Celestia approached a thousand pounds.

“Just a little more... mmm...”

She clenched her fists and strained, bringing on another surge of growth. The frame cracked in two and she fell to the floor, the impact jostling her breasts and sending streamers of milk in all directions.

“Ooh yes, I could get used to this...”

She stretched out her arms and found she could touch both walls. As her growth spurt slowly wound down, her feet pushed against the far wall and she had to tilt her head forward a little to avoid the ceiling. Her gargantuan boobs filled her lap, and the remains of the matress had all but disappeared between her immense ass cheeks.

“Fuck, I need to cum.”

She couldn't see her nether regions hidden behind her massive chest but she could certainly feel where it was. Her large clit throbbed angrily as if demanding attention, and she was all too happy to oblige.

“I'm sure you do, but that may have to wait for a while.”

She looked down between her legs and there was Discord, gazing up at her and holding a vial that seemed oddly familiar.

“Goodness, you have been busy.”

She spread her huge legs, presenting her gaping love tunnel to Discord, glistening with her juices.

“You bet. And I'm ready for you now.”

Discord nonchalantly placed the vial carefully on the floor and strolled nonchalantly forward, leaning against one of Celestia's legs and sinking into the soft abundance of thigh flesh.

“Not quite, your Highness. But getting closer all the time.”

With that, he leaned forward and firmly grasped Celestia's basketball-sized clit in both hands. She groaned loudly and reflexively slammed her fist down, shaking the walls.

“Gotta cum... so bad...”

“Patience, Celestia. Patience. Now, let's begin.”

He moved back to where he had left the vial and lifted it up.

“I think I'll need a little more than you since you've got a head start.”

Without hesitation he twisted out the stopper, raised the vial to his lips and began to drink, stopping when roughly a third remained. Then he lowered it and wiped his mouth with the back of his hand.

“Hm. Sweet, tangy. Perhaps a hint of blueberry. Your turn, Princess.”

“What is it?”

“Don't worry, you'll soon find out. And I don't think you'll be disappointed.”

Intrigued and excited, she took the vial from Discord, holding it between her thumb and forefinger. Despite drinking only a third as much as him, drinking the potion when already twenty feet tall like Celestia currently was, the effect would be markedly larger than for Discord.

“Must dash, I'll meet you outside.”

“But how am I supposed to get out? My foot is the same size as the doorway!”

“Patience!”

He broke into a jog and headed for the front door.

Must get outside before it starts or I'll be stuck in here...

Back upstairs, Celestia was feeling a little woozy.

“What in Equestria is happening to me?”

Very soon, she'd have an answer.

“Darn, I swear I took the right turning. I've been here enough times.”

Twilight looked around, trying to see the spires of the royal castle. By now she had resorted to holding up her leggings with her hand indefinitely as they refused to stay up over her ass.

“Ah! Finally!”

Just above the roof of a house at the end of the street was a very tall spire. She started jogging toward it, booty meat jostling in her leggings and her tits slapping against her stomach. As she made her way down an alley between the row of houses, she felt the hint of a tremor beneath her feet. Emerging on the other side, stretching out above and to each side, was the castle in all its splendour. But what caught her attention was the enormous figure in front of it, and getting more enormous as she watched it.

Her jog turned into a walk before she came to a halt and stared.

“...Discord?”

He was grunting and groaning as he expanded in all directions. His left hand was massaging the underside of a rock-hard penis the size of a locomotive, while his right was up in a flex, a bicep the size of a car extending from his thick arm. Dangling in front of his thighs, thick with brawn, was an impossibly huge ball sack big enough to crush a house. And still he grew, far too absorbed in his growth to notice Twilight behind him.

As she came close, he moaned with wild abandon as he surged once more. His feet widened and lengthened, cracking the ground beneath him. She could hear his taut balls gurgle and growl as they flooded with gallons upon gallons of seed, only a few feet from the ground as they finished expanding. But her eyes were drawn back up to his monolithic tower of power, which must have been 25 feet long, just about a quarter of his entire height. A constant stream of pre was gushing from the throbbing head and splattering on the ground at his feet.

“Mmm... yes... seems like I've finished my ascension just in time to enjoy hers.”

Twilight frowned. Who did he mean? Suddenly one of the windows of the castle began to crack, then shattered completely, frame and all, as a huge foot plowed through it accompanied by an effeminate moan in a voice all-too familiar to Twilight.

Oh no...

Beside the window, another huge foot blasted through the wall sending a cascade of dust and debris onto the ground below. With a loud crack, Celestia's head forced its way out of the roof, followed by her shoulders. As her feet touched the ground, she was essentially using the first floor of the castle as a seat. She began to stand, easily pushing aside the walls and roof. The tops of her immense breasts forced their way out, and her super-wide hips ploughed through the rest of the debris. She stepped forward and wiggled her hips to clear off the mess, each giant breast jiggling and wobbling, Twilight's eyes were glued to the 6-foot wide nipples dribbling droplets of milk. Looking over her shoulder, she brushed off the debris that had gathered on the shelf of her enormous ass. Discord hungrily eyed every inch of her gigantic, voluptuous body.

“Oh yes. That size certainly suits you.”

Evidently he liked what he saw, as Twilight was surprised to see his erect shaft tense up even more, the pre gushing from the tip of his giant dick increasing in volume.

Celestia laughed and moved close to him, engulfing his huge shaft in her equally huge tits.

“I could say the same about you.”

He drew her in close and brought her full, soft lips to his own. Their tongues danced as Discord brought his hands down her back and onto her gigantic ass cheeks, groping and squeezing as his hands sunk into the abundance of warm flesh. After a while, thoroughly enjoying himself but determined to push on, he broke the kiss.

“I'm glad you approve. Why don't we get started?”

“With pleasure.”

She turned and bent forward, resting her hands against the roof of the castle. Twilight was stunned by the enormity of her posterior; there was big, and there was BIG. Each cheek could easily seat a hundred people. It was so wide and full that even on her giant body it looked way oversize. The action of turning alone displayed how soft and supple the acres of flesh were, her cheeks rippling and bouncing off each other.

Wasting no time, Discord pushed his cock downward and with both hands guided it towards the massive, sopping cunt on display between Celestia's full thighs. It was a tight fit, but thanks to her huge size and how well-lubricated they both were, foot after foot disappeared into her dipping folds. Her heartbeat increased and the pitch of her moan raised as more of the thick pillar filled her passage. Discord was getting worked up too, the feeling of his immense member being packed into her tight, warm pussy driving him crazy. He drew back, hands firmly pressed against the expansive hips in front of him, and prepared to thrust as hard as he could. But he could swear he heard a voice behind him...

“Discord! DISCORD! What IS this?”

He turned around looked down. Celestia was too absorbed in the mind-blowing sensations inside her to care about her surroundings. All she knew was this was the horniest she had ever been in her life, and that the gigantic cock stuffed deep inside her might just be enough to satisfy the carnal desire gnawing at her being.

“Well well, if it isn't your student, Princess. I'm afraid you're too late, Twilight. The party has already started and we're almost at the big finish. But I'm glad you're here to witness the dawn of a new age of Chaos. Your teacher here is about to be pumped full of tons of my seed, enough for thousands of unstoppable minions that will do my bidding so I don't have to. And there's not a thing you can do to stop it! Nffgh!”

He groaned as an impatient Celestia pushed her hips back, the thick slab of meat spreading her open.

“See? Even she can't wait!”

He responded by thrusting forward as hard as he could, ramming his cock as deep into her as he could as she writhed under him, wailing incoherently. He drew back and thrust again, his giant balls slapping against her thick thighs and sloshing with seed.

Oh gods, what am I going to do?

Closing her eyes and concentrating, she could detect a flicker of magic inside Celestia's womb. There was still a lingering source of magical power, a remnant of the anti-impregnation spell she had cast on herself earlier that day.

That won't be enough to stop the load inside those balls. I'll have to do something.

She gingerly snuck up beneath the sweating, moaning couple locked together above her. A mixture of their juices was oozing down and splashing at their feet, nearly landing on Twilight's head.

As Discord re-positioned himself for a deeper thrust, Twilight stretched up and placed both palms against his warm, billowing sack. Despite his immensity, his scrotum was still sensitive and he detected her touch.

“Oo, I knew you'd come around, Twilight. Enjoying yourself down there?”

She focused, a bead of sweat rolling down her brow as she concentrated with all her might. Despite her prudeness, in her limitless curiosity and fascination with magic of any kind she had indeed learnt a number of sex-related spells. She knew the male equivalent of the anti-impregnation spell, and was able to build onto Celestia's magic with her own, forming an ethereal influence that would, in combination with what was left inside the Princess, would be just enough to prevent the impending tsunami of seed from making her pregnant.

But that alone wouldn't be enough. Discord, not one to give up on a scheme, would keep trying until the barrier wore down. She had to remove his power and take away any chance of this plot from ever coming to fruition.

I'm not sure there's a spell for what I have in mind... I'll have to improvise.

With effort, she was able to trace the influence of the potion Discord had ingested to make himself bigger still coursing through his veins. If she could force that magical essence into his testes and make him expel it, his next orgasm would cut him down to size.

Ngh, almost there.

With one final effort her unorthodox spell fired up through her palms and into Discord. He looked down.

“I appreciate the enthusiasm, my dear, but I don't think you're helping. Shall we try another position, Princess?”

All she could do was mutter incoherently as Discord's thick, long length slid out of her saturated snatch. Irritated at the interruption, she begrudgingly stood up straight and turned back around, juices running down her legs.

Discord laid out on the ground in front of the castle, his towering cock mimicking the castle spire above. Celestia wasted no time in positioning herself above it, and Discord steadied it between his hands. Slowly, she bent her legs and lowered herself onto the monstrous dick.

“Ohhhh shit... yessss...”

Yards of thick, hard-as-steel flesh forced her pussy lips apart as she forced herself down onto it. She felt a pressure in her loins and her muscles clamped onto the meat missile, sweating and straining as she forced it deeper and deeper. Discord could only grit his teeth and snarl as his cock was forced into the tight, hot passage

“Fuck! Yes!”

At last, she was sat on top of Discord's legs, the entire length inside her. She squirmed and wriggled at the feeling of being so incredibly full. With the shortest of pauses, she rose up then SLAMMED back down, her insides stretching and reshaping to cater for every square inch of the cock's immense bulk. She tensed each time she slammed against the base, milking the pre-spurting length and convulsing unintentionally each time it refilled her tight cunt. Another thrust, and another. But still she wanted more.

Discord began to thrust up each time she came down, holding onto her hips and burying himself as deep as he could in the Princess. They both began to speed up as the climax approached, grunting and groaning as Discord's fat pillar pounded Celestia's confines over and over again.

Celestia came first, screaming at the top of her lungs as she felt a knot tie in her core and went over the edge. Twilight covered her ears as the giantess cried with abandon, her pleasure peaking and her muscles clamping down as hard as they could around the shaft. She panted and shuddered as she rode out the orgasm, Discord's thrusts becoming irregular as his own climax approached.

“Here... it... COMES! NNGH!”

He roared as his cock twitched and the head flared. His balls drew in and clenched as they sent their huge load upward, the gush of thick, hot spooge blasting from his tip and flooding deep inside Celestia. More and more of the creamy jizz spurted out in one long jet as he hosed down her insides with his seed.

His balls relaxed briefly then clenched again, a second flood of cream flowing into the Princess and blowing out her stomach. Blast after blast, jet after jet, and still he came. The feeling was incredible, but something wasn't right.

Am I... nff... getting... uhhnn.... smaller?

He was. With each thick rope of jizz exploding into Celestia he got a little smaller.

“N-n-oooo... nn....”

He tried to stop cumming, but his body had taken control. Gallons of jizz kept flowing out as his gigantic balls emptied themselves.

Smaller and smaller Discord shrank, until Twilight couldn't see him underneath the still-huge Celestia.

With one final spurt, Discord's member fell limp, back to its original size. As had the rest of him, for that matter.

“Ungh... curse you, Twilight. I was so close.”

“But not close enough, Discord.”

With barely an ounce of strength left, all Discord could do was follow the guards into the castle and down into its deepest cell. Twilight had made him shoot out all his extra strength, and then some. She turned to Celestia and shouted up to her.

“Uh, Princess? Are you okay?”

She sat back, her giant ass spreading out and nearly plowing into her student.

“Oh, I could be worse. I quite enjoyed all that.”

“Yeah... I could tell. What do we do now? I don't know how to shrink you.”

“I think I do. But I'm still feeling a little horny. Could you give me a hand? Maybe two?”

She laid back facing Twilight and spread her legs, revealing her engorged, throbbing clit and sopping tunnel.

Well, I'd better do as she says. Don't want her to crush me.

She began to walk forward into the canyon between the enormous thighs rising up either side of her.

“Thank you, Twilight. You really are my most faithful student.”

Solar Eclipse (Luna x Celestia, breast/butt expansion)

Dear Princess Celestia,

I'm still incredibly grateful to have been honoured with the title of Princess, it still hasn't quite sunk in yet. My friends are so happy for me and they all hope you are well. I know you've been resting up for quite some time now, but Luna tells me you feel almost ready to return to your duties. It will be wonderful to see you rise the sun again!

There is something else I've been meaning to talk to you about. I remember you mentioned to me that when I became a princess my body may go through some changes? Don't worry, I haven't sprouted wings or anything. I've gotten a little taller though, perhaps three inches since my coronation. Everybody has noticed but I expected it. What I wasn't expecting were these other... changes, that seem to be even more noticeable than the height at least to most of the men I've caught the eye of, and some of the women as well.

I've grown huge! And I don't mean fat, well kind of, in certain places. My hips, my rear, my thighs, and my chest have all expanded as if they had been filled with water. That's not what happens, is it? They don't feel like they're full of water... Well, my breasts kind of do. Actually, right now they feel kind of tight inside, like there's a pressure building. It's really weird but it feels nice. Should it feel nice?

Spike keeps laughing at me when I try to put something on and it doesn't fit. The best I can manage is a shirt that just comes down just above my belly button. It used to go down my waist but with these things sticking out it's nowhere near there. Only one thing in my whole closet can fit my lower half, a pair of track shorts that feel fit to burst. Could you help me? It's so embarrassing, I'm not sure I have the courage to walk around town, let alone see my friends.

Although, in honesty, I have always yearned for a curvier figure. It's not much being stick thin, especially around Applejack and Fluttershy who have curves to die for, or what Pinkie Pie calls "cushion for the pushin'", whatever that means.

It would be nice to speak to you, and I'd be honoured if you came and visited me.

Your faithful student,

Twilight Sparkle

Celestia put down the letter on her bedside table and laid back, eyes closed, a little aroused. She couldn't help but get turned on by the thought of her cute little student growing into a big, voluptuous beauty. She empathised with Twilight, both had gone through quite extraordinary changes. Perhaps when she visited her student she'd be able to convince her that being curvy didn't have to be a bad thing, like Rarity did for her. Celestia thought back to when she was slimmer. She found herself not really missing it; with the passage of time and the encouraging words (and behaviour) of Rarity, she found herself really beginning to enjoy and appreciate her expanded physique.

She opened her eyes and lowered her gaze eyes wandering over her body. She had to lift her head off the pillow to see over her enormous breasts, and examined every inch of her body; her divine hips, incredibly wide and full, a potent metaphor of her abundant fertility, and below them, her long, smooth legs with full, juicy thighs squeezing against each other. She wiggled her toes, they seemed a long way away. Had she been getting taller? That couldn't be right...

Am I really taller? Maybe I'm growing in all directions.

Deciding to investigate further, she sat up and swung her legs over the side of the bed. Standing up, she stretched, arms above her head, gigantic breasts thrusting outward like two pumpkins stuffed inside a brassiere, her large nipples poking the material. Speaking of bras, she noticed this one was getting a little tight, which was very strange because it was a good fit only 10 days ago. None of her nightwear fit her properly any more, but she didn't usually feel the cold so was happy to go to bed in her underwear. She walked over to the mirror, noticing she couldn't see the top half of her head in it when she stood up straight. She didn't remember being too tall to see her whole reflection in this mirror. Stepping closer, she scrutinised her chest. Breast flesh was oozing out from below and the sides, and the upper rim of the bra was pushing against the top of her breasts. Her bra wasn't so much holding her boobs as it was covering them, or at least trying to.

Further down, her hips seemed even more expansive than usual and, as she suspected, when she turned to the side her buttocks looked staggeringly large. She couldn't resist a quick squeeze, and grabbed a handful of ass in her hand which looked noticeably small beside her monster cheeks. She was pleasantly surprised by the softness and pliability of her rear, and the way the flesh flowed and displaced in her grip. She felt fer libido rising as she played with herself.

Dammit, am I going to have to masturbate again?

Her sexual drive, along with her curves, seemed to have increased recently too. Celestia didn't know it, but her recent bout with Rarity had tapped into her long-dormant hyper fertility. The Princess and her sister weren't like normal people. Like their magic, which was far more powerful than anyone else's, locked away deep inside them was the very essence of sexuality that when tapped would trigger their transformation into divine beings that craved sex, and nothing more. It was with this ability that their world was first populated; the sisters' ancestors used their limitless fertility to foster the seed of life and spread it across the land.

Celestia had inadvertently triggered this innate ability and was slowly blossoming into what could be described as a living Aphrodite; a goddess of love, pleasure and sex. If she thought she was big now, she was soon in for quite a surprise.

I'll call round Twilight's later, I need to deal with this. Going down to the gym to take a few measurements couldn't hurt either.

She moved back to her bed and gently laid on it, her bright hair splayed across the pillow, twinkling in the delicate morning sunlight pouring in from the window. Her delicate hand pushed down between her thighs, while her other hand slid across her left breast, fingers digging into the abundance of supple flesh. Like most of her body, Celestia's vagina was oversize. It could accommodate her fist without much difficulty, and responded powerfully to stimulation. Her thumb and index finger caught her large clit and she squeezed, moaning through her teeth. If her vagina was sensitive her clit was doubly so, the softest touch eliciting euphoric sensations.

Oh gods... yes... it's never felt this good before...!

The Princess began to fist herself like a woman possessed, her now dripping-wet sex making a 'schlump' sound every time she thrust her hand into it. The bed creaked as she pounded her pussy repeatedly, her huge jugs jiggling on her chest, nipples standing erect, her pristine skin glistening with the first traces of sweat from her effort.

Celestia's hyper fertility was coming closer and closer to fully awakening from its slumber every time she pleasured herself. Her growth up until now hadn't really been significant enough for her to notice, but when she crossed the threshold it would be impossible to miss. Each time she pleasured herself it felt more satisfying, and each time she did it she came closer to unleashing her power.

She continued her rhythmic self-service, her hand pistoning in and out of her tunnel. She shuddered, clamping her hand onto her breast. Like with Rarity, the stimulation made the nipple swell and elongate, but unlike last time her entire bosom began to expand as it filled with milk. She could feel orgasm fast approaching, a tightening in her core, an increase in heart rate. Suddenly, it came over her, and her pussy spasmed, tightening around her fist.

“Mmmmnnn!”

She closed her mouth to try and quieten her uncontrollable moaning as the orgasm took her into sensory overload. A blast of hot, thick femcum splashed over her hand, still inside herself, and gushed out onto the bed. She licked the back of her hand which was dripping with her cum as the next load flooded out, and another, and another. She seized her breasts and reflexively groped them hard with the next convulsion. They were notably larger than usual, as were her nipples, which pushed up four inches between her fingers.

“Ungh!”

As she groped, the floodgates opened, and powerful jets of milk rocketed from the tip of each nipple. They rose up like a fountain above her before falling back down and splattering against her, washing her in warm cream. The squirts of cum from her pussy were diminishing but the power of the convulsions in her core didn't diminish, as if her body was desperate to release every last ounce of girl-goo.

As quickly as it had began, it was over. The Princess was covered in milk and cum, a goofy smile adorning her face. Inspecting her body, she noticed that her chest was definitely larger than it had been just a few moments ago. Looking at her toes again, she noticed her feet were over the edge of the bed. She'd grown taller!

What in Equestria is happening to me?

Though her hyper fertility was no longer strictly a necessity (unless Equestria suffered some apocalyptic event that severely diminished the population) it was something that she nonetheless had inherited from her eons-old bloodline and it would still react just as strongly to sexual stimulation as it had all those years ago. Celestia noticed a link between pleasuring herself and these mysterious changes. Perhaps some investigation in the castle library was in order.

Despite having lapped up most of her juices she was still in desperate need of a shower.

Okay, I need to get myself cleaned up. Then a quick taking of measurements in the gym, and after that I'll visit my student.

Slowly opening the door to her chambers, she peered out into the hallway, making sure no one would surprise her. She noticed that she had to stoop forward slightly to fit through the door frame, something else that had changed. She concluded that she really was taller... but how? Why? This wasn't the best time for philosophising, so she went back to scanning the hallway. Satisfied, she tiptoed across to the bathroom. Quickly turning the gold door knob, she stepped around the door and walked in backwards, keeping an eye on the hallway. Finally she gently closed the door and locked it. She turned, and to her horror, there was Luna, haibrush in hand, staring at her.

Celestia felt very exposed; here she was in front of her own sister in only her underwear. They both blushed, and Luna turned away.

“I'm so sorry, I should have locked the door!”

“No, I should have knocked.”

Celestia turned to leave, but Luna spoke.

“It's okay, I can brush my hair in my room. I just came in here to use the mirror.”

She smiled and Celestia stepped to the side, arms crossed over her immense chest trying in vain to hide it. After her recent growth spurt each breast was almost twice as big as her sister's head, with an excess of flesh oozing out from all directions.

As Luna passed her big sister her nostrils were filled by an intoxicating mixture of her perfume, milk and juices that nearly swept her off her feet and started a veritable fire in her loins. She turned to her sister to ask her what perfume she was wearing when she noticed how tall she was.

"Celestia, you look taller! What happened to you? Did you finally use that potion Zecora made for you?"

Celestia suddenly remembered the vial of liquid gathering dust on her shelf of potions which Zecora promised would, in her words,

With just one sip enlarge your hips and rear,
Expand your chest and make curves appear,
Or if taken by the other gender,
Enhance their muscles and augment their member.

But heed my words and do not goof,
Too much and you'll grow through the roof!

She had hoped her sister wouldn't notice her changes, which was a bit far-fetched as she really had grown quite considerably. How could she explain when she didn't know herself?

"No, I didn't. I wish I knew, sister. It all started a couple of weeks ago when I..."

She hesitated. Would she be honest, and tell her sister what she had gotten up to with Rarity, as well as what she'd been doing alone in bed?
"I had a fling with Rarity. I don't know if it was love or lust, but we got each other off in a big way. I've never had an experience like that, and it felt incredible."

Luna was feeling a panoply of emotions. Bewilderment, embarrassment (she had never spoken about such an intimate subject with her sister) and even a touch of excitement. The thought of two beautiful girls, the stunning Rarity and her own gorgeous sister exploring each other struck her as intensely erotic.

"While she was... massaging my chest, my body reacted strangely. I felt a heat, a pressure, building inside me. Before long my breasts started growing, and my nipples too. The sensation was indescribable, like an orgasm in my boobs. Before long the pressure reached a plateau and milk started shooting everywhere. It flew right across the room, it was crazy."

Though she was hiding it, Luna was enraptured, and feeling very hot under the collar. This was her own sister, but the way she was describing this was enough to get anyone going. Luna could never tell Celestia that ever since she had started packing on the pounds and developing amazing curves she was becoming more and more attracted to her. It felt wrong, but that wasn't enough to out her off. Celestia had always been beautiful, but her growth into a voluptuous goddess was too much for Luna to ignore. At first she had simply been a little jealous. She had always wanted a bit more meat on her bones, but now her sister was on a whole new level. It nearly drove Luna wild every time Celestia hugged her and smothered her in her enormous jugs, or when Celestia called her into her bedroom to ask "does my butt look big in this?" which, considering she had a huge booty, it always did, whether it was pushing against a loose silk dress or packed into jeans or office pants.
"When I got home I noticed my chest hadn't gone down, and my libido had gone up. I couldn't help it, I had to pleasure myself to release the tension. It worked, and I felt great, but now each time I do it, it feels even better. It's getting hard to stop, and I think it's making me grow bigger."

She lowered her arms to her sides which, until now, had been covering her chest. Luna's jaw dropped, this was easily the biggest pair of tits she had ever seen.

"Are they real?"

Celestia looked down at them.

"Yeah, they're still mine. Just... Bigger."

Luna raised her arm and tentatively lifted her index finger, wanting to feel for herself. She poked hard against her sister's large orb, and by chance pressed against the nipple, hidden behind the tight bra.

"Oof!"

Celestia bit her lip as her sister's finger pushed against her ultra-sensitive nub. Luna drew her hand back quickly but her sister's body was already reacting. They both watched as the nipple fattened and elongated, tripling in size. Celestia clenched her fists as the other nipple joined in.

"Fuuuck... Feels so good..."

Celestia tilted her head back and groaned, closing her eyes, hands pushing against the sides of her breasts. Her inhibitions gone, she no longer felt any embarrassment from the presence of her sister as the powerful sensations flooded her senses. Her nipples continued to distend, throbbing larger and thicker as they pushed against her bra. Luna was frozen in place, eyes locked on to her sister's teats as they grew and grew, as if they were reaching out to her. Slowly, imperceptibly at first, Celestia's breasts began to gradually swell. Her toes crept forward as her feet enlarged, and she gradually raised above her sister as her height increased.

Her large ass cheeks pushed outwards and fattened, her panties being swallowed by the long cleft between her immense buttocks. Her thighs thickened and her hips widened to support the extra mass of her godly ass. The extra weight caused the cheeks to sag ever so slightly; they retained their sublime roundness, but a crease formed where her thighs met her cheeks, both seeming to compete for space as they pressed against each other. She had been standing quite close to the bathroom wall, and before long her monumental ass cheeks had grown out and pressed against it without her moving, spreading outwards across the tiles as more booty meat piled on.

Suddenly, the bra which had been trying desperately to hold back the tide of flesh failed. The hook holding the straps together snapped, flinging the brassiere forward and into Luna's face.

What smelt like the sweetest dairy cream flooded her nostrils, almost overwhelming her. She drank in the scent, holding the bra against her face. Celestia smiled at her little sister, now kneading her giant udders like warm dough, droplets of milk dampening her soft skin. All anxiety and worry had left her system, she now felt completely at ease bare-chested before her sibling as if it was the most natural thing in the world. As she felt her libido rise, her nether regions began to moisten, her sex releasing a sweet fragrance that bombarded Luna's senses until she felt tipsy. Celestia examined herself.

"I've grown again. I really need to get to the bottom of this."

Hearing a gushing and gurgling sound, Luna looked up and Celestia looked down; something was happening. Suddenly, Celestia's boobs heaved and billowed, the areolas swelling into hemispheres, the rock-hard nipples trying to hold back an immense build-up of milk. Without warning, they gaped open and the flood gushed out, splashing against Luna's face. Celestia shuddered as her nipples throbbed, releasing another cascade of cream which splattered against Luna, some wetting her shirt and rolling down her neck into her cleavage. Luna opened her mouth to receive the third blast, Celestia pushed her tits together and pointed her nipples towards her sister's mouth as the next wave burst forth. Most of it hit the target and Luna's mouth was filled with sweet nectar, she savoured the taste before swallowing eagerly, the liquid sliding smoothly down her throat and warming her stomach. Celestia's mouth hung open as she mashed her melons together and let blast after blast coat her sister's face and chest until she was soaked. It was some time before the squirts began to weaken, turning to trickles that wove their way down the underside of her breasts and streamed down her stomach.

"That was amazing," said Luna as she stepped forward and took one of her sister's huge mammaries in both hands, "but I'll make sure you got rid of it all." She gazed up into Celestia's crystalline magenta eyes, lips curling into a smile, before latching onto the giant nipple. It was as though she had a pacifier in her mouth, such was its size. Celestia sighed contently, holding her sister's head in her hands and lightly pulling her in.

Luna began sucking in earnest, causing Celestia to groan out loud. Presently a little spurt of milk wet her tongue, which she swirled around in her mouth before swallowing. Still sucking, she pulled away and with a 'pop' her sister's engorged nipple slipped out.

"Mmmm... Thank you, sister. Oh goodness! I'm supposed to be seeing Twilight today and I still haven't showered."

Luna had a very naughty thought. Before today, she never would have considered it, but after her intensely intimate session with her sister it seemed like a fantastic idea.

"I'm not exactly clean either, would you mind if I got in with you?"

Celestia gave a toothy grin and gave Luna a bear hug, drowning her in breast flesh.

"You minx! You'd love that, wouldn't you! Well, so would I."

Luna returned the hug, stepped back and began to undress.

Celestia only had her panties to remove. She first had to pull out the back which had become sandwiched between her enlarged butt cheeks. She un-wedged the frilly white material and began to force the little panties down over her big, meaty thighs, bending over as she got them down to her knees. She was surprised with her indifference towards her growth. She had changed quite considerably but for some reason it felt completely normal, as if she had always had the capacity to change and it was just a part of who she was, which, unbeknownst to her, was in fact the case.

Luna gently slid her dark purple full-length skirt down her legs, revealing cute royal-purple underwear emblazoned with a small white crescent moon. Despite being much smaller than her sister she still had curves. Her 38 inch hips supported a sizable bubble butt, and on her chest, cradled by an exquisite bra the same colour as her panties, nestled a pair of DD breasts capped by dainty light-pink nipples.

She turned to see Celestia bent over, pulling her panties off over her feet. As she stood up straight her enormous cheeks jiggled as her rear settled back into place, Luna was in awe at the sheer enormity of it.

"Damn, I thought I was the Princess of the moon!"

Celestia turned and followed her sister's gaze down to her derrière, and with a little gasp understood what Luna meant.

"Did you just compare your big sister's butt to the moon?"

Luna giggled and Celestia smirked.

"No, each cheek is a moon, you've got two moons back there."

"You little... You'll pay for that!"

Luna was too busy laughing at her own pun to notice her sister marching backwards towards her, the two giant dumplings bouncing and shaking with each stomp of her big feet as she advanced back towards the wall.

"Unf!"

Luna grunted as Celestia's giant ass slammed against her, pinning her to the wall. After her last growth spurt Celestia was just shy of seven feet. When she backed herself against the 6 foot Luna her butt met her stomach, almost wrapping her in thick meat. Luna marveled at the softness and doughiness of the immense cheeks as Celestia turned her head, a smug look on her face. She rested her hands against the wall either side of Luna while gyrating her hips, sliding her huge butt balloons all over her sister's trim torso. All Luna could say was,

"Wow."

Celestia laughed and bent forward, pushing her ass out and squeezing Luna against the wall who gave a little moan, kissing her sister's lower back and delicately running her hands along her expansive hips that dominated her field of view.

"Pull back a second."

Celestia complied and straightened, her cheeks giving their trademark jiggle as they re-settled. Luna knelt down and placed her hands around her sister's hips, of at least as far round as she could, they were far too wide to enclose in her arms. She dove her head into the vast sea of booty, savouring the delicate, spongy flesh and even using her cute little tongue to lick at the abundance of velvety-smooth Princess booty. Celestia smiled broadly and closed her eyes.

"Gosh, you are naughty. That feels wonderful... mmm...."

Withdrawing her head, Luna stood up, and gave her sister's ass a good, hard SLAP, sending the flesh into a frenzy of wobbling. Celestia pouted, turning her head as a faint pink hand print appeared on her rear.

"Ow! What was that for?"

"Pinning me against the wall with your fat ass!"

"Fine, I guess we're even."

They both giggled, and Celestia stepped over to the tub, turning on the water. Luna gently massaged the ass cheek she had slapped, rhythmically rubbing little circles into its soft mass. Before long steam was rising as hot water sprayed from the shower head. Celestia stepped in and Luna followed, hugging her sister from behind. Taking up the coconut-scented hair gel, Celestia squirted out a dollop onto her hand before folding it into her hair. She handed it back to her sister who did the same, coating her deep purple hair. Before long Luna's hand found its way into Celestia's nethers, and she began to firmly caress the wet folds.

"Ungh... Yesssss..."

Luna's other hand began to rub the large engorged clit while Celestia twiddled her growing nipples. Before long Celestia was moaning loudly as Luna's hand emphatically wormed its way around her sex. She was so on-edge that it wasn't long before thick white cum was washing over Luna's hand and splattering noisily against the tub, so gooey that it temporarily blocked the drain while the water slowly broke it down. After coating her sister's hand and the tub in a thick layer of spunk, Celestia's pussy gradually stopped spasming. Luna sucked the goop from her fingers.

"Wow, you taste good."

Celestia turned around, wrapped her arms round Luna and locked lips with her, their full lips grinding and their lips dancing. Luna reached around and began to knead her sister's giant booty, pinching and groping the soft globes. Celestia broke the kiss.
"Time I returned the favour."

She stepped to Luna's side and held her waist while her other hand drove into the labia and down inside. Luna's mouth formed into a silent scream as the hand drilled her.

"You're enjoying this aren't you?"

Luna managed a shaky nod as Celestia twisted her wrist and pushed deeper, pumping in and out like a cylinder while Luna rode the roller coaster of ecstasy. It was over as quickly as it had began; Luna squealed as she climaxed, juices dripping down her leg and mixing with the rushing water. After a final peck on the cheek, Celestia washed herself off and stepped out if the tub, drops of water glistening on her pale skin, resting atop the swell of her breasts and the shelf of her bottom. They took turns drying each other's hair and backs, then wrapped themselves in towels, Celestia's big nipples tenting hers.

"I can't put into words how amazing that was. I never thought getting so close to you would feel so fulfilling, sister. I love you."
Celestia smiled and embraced Luna.

"You too. I must dash, Twilight is expecting me soon."

She turned and made for the door, giving Luna a first-class fire of her large rear wrapped in the towel. Luna sighed to herself.
"I need a body like that."

Back to normal (mostly)

"Still eager as ever, aren't you?"

Celestia was laid on her stomach, legs apart, head resting on a large pillow. Behind her and laying on the lower half of the bed, Luna had her sister's substantial ass cheeks cradled between her hands as she dug her face deep into the mass of booty meat.

"Mhhhhhhm."

Every little movement of her head sent little ripples through Celestia's perfectly smooth, spherical behind, Luna's fingers digging deep into its soft abundance. She breathed in, nostrils filled with the sweet, incredibly pleasant scent seemingly woven into her sister's being, and drew back. She watched the huge derriere before her, marveling at the way it bounced, rolled and shook with every movement of her hands.

"I have to admit that I did rather enjoy being a hundred feet tall, but it's nice to be back to normal. Lets you do things like... whatever it is you're doing to me now."

Luna chuckled and looked up.

"Normal, sister? You've always been quite well-endowed in this compartment,"

She gave Celestia's big ass a good, hard squeeze, a little groan escaping her lips.

"But there's definitely more here than there used to be. I wouldn't say you were completely back to normal."

"Are you complaining?"

Luna lowered her head, bringing it close to her sister's perfect rear once more.

"Does this feel like complaining to you?"

She dove back in, burying her face into the warm, soft embrace of those twin pillows.

"Mm, I suppose not."

Shifting down a little, Luna began to lap at her sister's nethers, tickling her labia with her lips before diving right in with her mouth.

"Ooooh, yeeees..."

Luna's tongue pranced and curled back and forth, from side to side, as she explore her sister's moist passage with her mouth.

"Nngh, gah, I'm getting close... already..."

Luna began licking more vigorously and Celestia cried out, her pussy convulsing and her entire crotch tingling. A hot, sticky wave of femcum splashed against Luna's lower face, and she swallowed a good-sized mouthful or two. Then another mouthful, and another, before drawing back. Celestia continued to groan, reflexively clenching her buttocks which jiggled and shook each time, accompanying another half a dozen waves of cum rushing forth and soaking the sheets.

She drew back, wiping her face, before laughing out loud.

"What the heck was that?"

"Like you said, not completely back to normal."