Tia's Troubles

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."