The Wagered World

by MassDriver

Rating: mature
Tags: Porn, Sex, Fetish, Profanity, Princess Celestia, Twilight Sparkle, Anthro, Princess Luna, My Little Pony: Friendship is Magic
Length: 13202

Twilight bets the Princesses she can run Equestria better than them. Turning it into a paradise of hyper-sized sex wasn't part of the bet, but it certainly turned out that way...

Twilight Sparkle is fed up with the state of Equestria. The more she sees, the lower her opinion of the royal sisters' leadership - so she comes up with a wager. She wants five years to run Equestria, and a detailed proposal for how she's going to do it. And she makes such a powerful case that Celestia and Luna actually accept; the sisters journey to the stars, and return five years later...

And Queen Twilight, in their absence, has done all she promised and more. Not only is Equestria prospering, but it's picked up some powerful sources of new magic. "Dark" magic has been utilized for the betterment of society, and perhaps more dramatically, changeling magic has allowed ponies to change their bodies in almost any way they wish. Most ponies are mares now, many of them with dicks; Equestria has become a paradise of sexual freedom, and the princesses, as newcomers to this changed world, are going to need a hyper-sized welcome...

Contains: Hyper, Futa, Princest, Cum Inflation

All characters are 18+. Commissioned by ppg1998

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

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Published 2018-11-10 19:10:02 UTC
Last updated 2018-11-10 19:10:02 UTC

Chapter 1

“...And the tax revenue would most benefit Canterlot if it funded the Council of Peerage.” Prince Blueblood coughed politely. “In my, er, humble opinion.”

“And you do not perceive, perhaps, a… conflict of interest?” asked Princess Luna wearily. “Seeing as how you hold a senior position in that very council?”

“Well, I understand your concern,” said Blueblood - although he didn’t seem to appreciate his proposal facing any scrutiny - “But I am merely looking out for the interests of the nobility. If we do not maintain a certain standard of living, then what meaning do our titles even hold?”

“Prince Blueblood,” sighed Princess Celestia, “Your presentation was very thorough, and your visual aids were, if anything, excessively elaborate. But we have the welfare of many groups to consider, and-”

“The Council of Peerage exists to institutionally babysit rich idiots,” said Twilight Sparkle, projecting her voice through the spacious throne room as she burst through the doors. “The nobility is a bloated tick on Equestria’s flank.”

“Excuse me,” snorted Blueblood, wheeling to face Twilight. “I-”

“You’re excused,” said Twilight flatly. She grabbed Prince Blueblood in her magical aura, along with the tripod stand that held his visual aids, and levitated them out the double doors, slamming them behind her.

“Twilight!” said Celestia. “I am… well, firstly, I am pleased to see your safe return, but… a bit perturbed by how you treated Prince Blueblood.”

“I wish to co-sign my sister’s sentiments,” said Luna, “with the addendum that I am happy to be rid of Blueblood.”

“Princess Celestia,” said Twilight. “Princess Luna.” She drew in a long breath. “I am done with this shit.”

Celestia uncrossed her legs and leaned forward. “Pardon?”

“I had a talk with the girls,” said Twilight, approaching the throne. “The Elements. Sort of a postmortem after we sealed away the Blight Widow.”

“Equestria owes you a deep debt of gratitude, once again-”

“Yeah, yeah, yeah,” said Twilight, waving her arm dismissively. “Look, we’re all sick and tired of Equestria being in near-constant peril, only being saved by luck and deus ex machina. This isn’t sustainable, your highnesses. There’s… a lot about Equestria that isn’t sustainable.”

She breathed in, puffing up her chest. (She didn’t have the most impressive chest - even after becoming an alicorn, she just had a pair of B-cups - but she presented it proudly.) “So I’ve decided I’m going to be in charge from now on.”

The royal sisters took a moment to digest Twilight’s statement - and an additional moment to confirm that she was serious. “Princess Twilight,” said Celestia, “This is… unexpected. So unexpected, in fact, that it casts doubt on your state of mind. I would be remiss if I did not address the possibility that the Blight Widow’s dark magic has affected you… or that perhaps you are not Twilight Sparkle at all.”

“By all means, Princess Celestia, scan me for corruption,” said Twilight, stopping a few feet from the throne and raising her arms. “All you’ll find is the exasperation of a pony who has been through way too much shit and stayed quiet for way too long.”

Celestia cast a spell that swirled around Twilight Sparkle, surrounding her with ribbons of gold light - and when the ribbons returned to Celestia’s horn, they carried neither the scent of a changeling or the acrid traces of dark magic. “You are indeed our Twilight,” said Celestia. “I apologize for my suspicion. If your latest adventure has left you with frayed nerves, you and your friends are welcome to guest accommodations at the castle, as well as the royal spa and all the generosity a grateful Canterlot can offer.”

Twilight sighed, her anger fading a bit. “That’s… kind of you, Princess Celestia. But this has been a long time coming, and relaxation is not going to change my mind. Equestria is fucked, your highnesses, and your mismanagement is to blame.”

“Princess Twilight, you are our equal in rank,” said Princess Luna darkly, “But your tone is not proper.”

“With respect, sister, I’d like to hear her out,” said Celestia - although her tone was somewhat dark as well. “Explain to us what you see as mismanagement, Twilight. And make your case that my sister and I are responsible.”

“Okay,” said Twilight. “Well, firstly, the royal guard and the lunar guard are pathetic. My brother had plenty to tell me about the challenges he encountered with training, with recruitment, with funding… Oh, and relatedly, cutting S.M.I.L.E. was a huge misstep. They could have been the start of a push to modernize our intelligence, and you backed off because of your outdated sensibilities. And speaking of outdated things, the nobility is almost entirely corrupt. It’s infuriating how they think the law can’t touch them, and it’s even more infuriating how often they’re right.

“Equestria is beautiful, but it’s sheltered, and that’s bred an unsightly strain of xenophobia. Remember how, shortly after I went to Ponyville, no one there even knew what a zebra was? Ponies shouldn’t need a top-notch education, like the one I got, to know about other countries where people sometimes look different. And with our considerable resources, we’re not aiding those other territories in any meaningful way - I mean, intervention is a potential can of worms, sure, but there are situations where we should be doing something.

“What else, what else,” mumbled Twilight, materializing a notepad and glancing at it. “Oh, right- dark magic. You know how to use it, you showed me how to use it, so you know it’s not inherently evil - but it’s outlawed because some bad apples used it to do evil in a very public way. I just think there needs to be some researchinto its potential.

“Discord,” she said. “Needs more oversight. He’s still a self-centered prick, and Fluttershy can only rein him in so much. As for the changelings, we bear a lot more responsibility than we like to admit for the conflict between us. I mean, Thorax is in now, so that’s water under the bridge, but still…

“Uh, let’s see. Oh yeah, foals are always running away from home and getting way farther than they should. I guess I don’t actually know if that’s a problem everywhere, but the fact it can happen at all points to a systemic problem…

“And… technology. The state of the art is all over the place, depending on the context. We have pull wagons and steam engines alongside arcade games and DJ equipment, and… well, it would take a while to explain why that feels inconsistent, but trust me, we could be doing better. We need to encourage research and development in fields that are lagging behind technologically.”

“And your proposal,” said Luna, “is that you run Equestria?”

Two thick binders appeared in Twilight’s arms, and she handed one to each sister. “This is my proposal, actually. It's a lot more thorough, and it covers the logistical challenges of placing me in charge during your absence. Raising celestial bodies, keeping the realm of dreams in order… it's all in there.”

“Hold on,” said Celestia. “Our absence?”

“I'd prefer to run this experiment without you looking over my shoulder,” said Twilight. “You've told me how badly you both need a vacation - and how you've been longing to visit the stars. I propose you take your interstellar vacation, give me five years to run Equestria, and… basically, if I manage to do better than the two of you, I remain in charge, and the two of you work under me.”

“A wager of sorts,” said Celestia.

“I'm very confident I can do this, your highnesses. I wouldn't gamble Equestria’s future on a long shot.”

Celestia sighed, testing the weight of the binder Twilight had given her. “Twilight Sparkle,” she said, “I have given much of myself to the prosperity of Equestria, and to be frank, what you propose is an insult to my dedication. But… I believe that you would not do this unless you truly believed it was for the best. I will review your proposal and return with my decision.”

Luna seemed even less pleased - but she nodded. “And I, as well.”

In the highest room of the highest tower of Canterlot Castle, a flash of brilliant starlight faded, and Spike rubbed his eyes, blinking until the spots in his vision disappeared. “They're really gone,” he said, turning to the window to gaze into the night sky. “I was sure they were going to change their minds at the last second.”

“You proofread my proposal, Spike,” said Twilight. “You saw how airtight it was. They know they're leaving Equestria in good hands.”

“I guess so,” said Spike. “So what now?”

“Now we get to work.”

Brilliant starlight flashed into existence on the tallest tower of Canterlot Castle, and the two royal sisters stepped out of the magical light. They turned their eyes toward Canterlot, their beloved city, but they barely had time to catch a glimpse before two arms wrapped them in an embrace - and two fleshy pillows engulfed their bosoms.

“Princess Celestia!” said the voice of Twilight Sparkle. “Princess Luna!” She stepped back, releasing them from her hug. “You’re back! I wasn't sure you'd make it five years on the dot, but I wanted to make sure I was here to welcome you, just in case.”

“Twilight Sparkle,” said Celestia. “I have a million questions-”

“Oh, you mean about all this?” said Twilight, gesturing to indicate her body. A lot had changed; she was taller, for one thing, just a few inches taller than Celestia. She was more voluptuous overall, with wide hips beneath her short black skirt and thick thighs tucked into dark stockings. Her breasts were so large they couldn't possibly be real - each one perhaps four times the size of her head, hanging down to her waist - but they appeared genuine and proudly defied gravity. She wore a regal cape, tall red high heels, long black gloves, and a crown of silver inset with rubies. She was scarcely recognizable as the young Princess Twilight the royal sisters remembered from five years previous.

And was there something inside her skirt? A rather large bulge, from the look of it…

“Well, I just wanted a new look,” said Twilight. “Something befitting a queen, you know? And now that it's so easy to change one’s appearance - that's part of the progress we've made, I'll fill you in on all that - I gave myself the kind of body I've always wanted!”

“Ah,” said Celestia. “Well, that is interesting, but I was actually going to say I had a million questions about Equestria.”

“Oh!” said Twilight. “Oh my gosh, I didn't mean to sound self-absorbed, I'm just really proud of my new look, and since it's the first thing you saw when you got back, I just…” She paused to collect herself. “Well, anyway - let me lead the way. All your questions will be answered.”

Twilight led them to the window and gestured towards the view of Canterlot. “There’s not a lot of changes visible from this height,” admitted Twilight. “Everyone agreed that Canterlot’s architecture is iconic, so most new buildings maintain that aesthetic.”

“I see some new crystalline structures,” said Luna, leaning out of the window.

“That’s right!” said Twilight proudly. “I’d love to show you some of those up close. Let’s head downstairs, shall we?”

Twilight led them down the spiraling staircase, talking as she went. “One of the most sweeping social changes is… Hm, I suppose the easiest way to start is by telling you that Chrysalis was apprehended about three years ago, and since then she has become somewhat cooperative. She had access to powerful changeling magic - which Thorax wasn’t privy to - and thanks to dark crystal technology, we were able to adapt those spells for use by ponies.”

“Dark crystals?” asked Celestia.

“Yes! Our research into dark magic yielded remarkable results; it’s not surprising that it was sought out by some of the most ambitious ponies in Equestria… it’s just a shame that they were all, you know, evil. The magic can generate a nearly limitless supply of dark crystals, which are an excellent building material in their inert state… and in an active state, they can store and reproduce magic in some fascinating ways. Using them, we were able to make shapeshifting magic available to ponies all across Equestria!”

“And that is how you modified your appearance?” asked Luna.

“Not just me!” said Twilight. “It became a bit of a fad for mares to give themselves penises.” Both sisters made a small noise of surprise, but Twilight plowed ahead. “You know how Equestria is - lots of mares, not a lot of stallions. There’s not enough dicks for all the mares who want to get fucked! And a few mares decided they could solve that problem by giving themselves penises. And eventually it wasn’t just a few mares… it was a lot of mares.”

“How many is a lot?” asked Celestia.

“About half, at last count,” said Twilight. “But it’s pretty easy for anyone to change it, so the number varies. Anyway, a lot of stallions started to feel… left out, I suppose. Being a mare with a penis looked fun and fashionable, and it was easy for anyone to change their body, so… at this point, practically everyone is Equestria is a mare.”

“That is… surprising,” said Luna, as the three of them emerged into a long marble hallway. “So many stallions were willing to change themselves in that fashion?”

“Yeah, I was surprised too,” said Twilight. “We’ve got some psychologists collecting data on the phenomenon, but it’s hard to nail down one reason. I hear a lot of former stallions saying that being a mare just feels more comfortable - they tell me that they can be more open about their feelings, and it probably helps that they get to keep their dicks if they want to. I can speak from experience - being a mare with a nice big dick is really the best of both worlds.”

“Ah,” said Luna. “I did think I noticed… something.”

“Yeah, I’m not that subtle about it,” laughed Twilight. “I didn’t go in a very subtle direction with my tits, either. What can I say? It feels good to big!”

She pushed open the door to a sitting room, where hot tea and fresh pastries sat on a serving cart. A maid bowed as the three of them entered - and after a moment looking into the maid’s face, both royal sisters recognized her as a former stallion who had worked a similar job five years ago.

“Anyway, that’s a pretty big change,” said Twilight, taking a seat on a large, plush chair and gesturing for the princesses to sit. “ Sorry if I don’t go over the changes in a logical order, there’s kind of a lot…” She poured herself a steaming cup of tea, then sat up suddenly. “Oh! Necromancy!” she said. “We’re doing that too!”

The princesses had been about to sit, but they stood bolt upright when they realized what she’d said. “Necromancy?!” said both of them, nearly in unison.

“Yes!” said Twilight. “Not making zombies, of course. That’s still illegal. But there’s some legitimate medical applications, and it permits ponies to speak with dead relatives.” Twilight paused, giving Celestia and Luna a pleading look. “I know this is a lot to take in,” she said, “But I hope you’ll extend me the same trust you gave me when you put me in charge. Equestria’s better off, and I think you’ll agree once you have a chance to see it for yourself.”

“I suppose we shall see,” said Celestia, taking a seat across from Twilight. Luna followed, and poured herself a cup of tea.

“Oh, you’ll like this,” said Twilight. “S.M.I.L.E. rooted out a ton of corruption among the nobles. Blueblood… well, long story short, he’s not allowed in the castle anymore.”

“Oh, thank goodness,” said Luna, taking a long drink of her tea.

Celestia sighed and shook her head - but after a moment, she was forced to agree with her sister. “Well done, Twilight.”

Chapter 2

“Well?” said Twilight, smiling encouragingly as the former royals stepped into the throne room. “I think you look amazing, but if there’s anything you’d like to change, I can take care of that for you.”

“These dresses are lovely, Twilight, but…” Luna let out a little sigh.

“They are rather similar to the dresses worn by chancellors in our royal court,” said Celestia. “I assume that is intentional. To remind us that we are… no longer princesses.”

“Well, I don’t mean it as an insult,” said Twilight. “But you lost the bet fair and square. You’re still important and respected, you’re just not princesses.”

“We knew the stakes,” said Celestia. “It’s a bit of an adjustment, is all.”

Twilight slumped in her throne, making her immense tits wobble in her lap. “Well, this is a bummer,” said Twilight. “I was excited to share all the good news about Equestria, but your demotion isn’t the happiest topic, is it?”

“The prosperity of Equestria is what truly matters, I suppose” said Luna. “And this is better than the last time I got demoted. From princess to prisoner.”

“Oof,” muttered Twilight. “Another bummer. Maybe I should have let Pinkie plan your welcome; without her, it’s up to me to turn this mood around…” She sat up - and her giant tits shook again. “Oh, I know! Chrysalis! Umbra!”

When Twilight spoke the names, wide circles of purple magic appeared on either side of her throne. She looked at one, then the other, peering expectantly at them - then, after several seconds of silence, she sighed and rolled her eyes. “Sorry,” she said, “They’re still very… proud. They like to make me wait. I do what I can to incentivize their cooperation, but building trust has been a slow-”

The magic circle on Twilight’s left began to glow brighter, and a second later the one on the right did the same. They expanded into columns of purple light - and when the columns faded, a pony stood where each one had been.

On Twilight’s left was Chrysalis. The deposed changeling queen was more voluptuous than Celestia and Luna remembered her being - not as outrageously proportioned as Queen Twilight Sparkle, but her breasts were F-cups at least and her hips were deliciously thick.

On Twilight’s right was… Umbra? Not a name the former princesses recognized, but the tall, dark gray pony was immediately recognizable as King Sombra. No other pony had that sharp red horn, or those green-and-red eyes, tainted with dark magic… but those features didn’t usually sit on a face that was so soft, atop a body so entirely feminine.
“Oh,” muttered Umbra, “They’re back.”

Chrysalis smirked. “Umbra, don’t be a bitch. I’m sure we’ll all be the best of friends in no time at all.”

“Hey, that’s the spirit!” said Twilight. “Only next time try it with about a hundred percent less sarcasm.” She turned to Chrysalis and Luna, extending her arms to indicate the ponies on either side of her. “Chrysalis and Umbra here are part of a sort of… work-release redemption program. A slightly more formalized version of the way I used to reform villains.

“Chrysalis works with our military and intelligence operations, including S.M.I.L.E. She has… lots of experience in espionage and intelligence-gathering. More experience than anyone suspected, I think.” Chrysalis’ thin smile became a toothy grin at the mention of her clandestine exploits.

“And Umbra - who you know as King Sombra… Uh, funny story there, actually. We wanted to bring Sombra back, with limits on his powers of course, and there was some… cross-pollination with the gender-changing magic we were studying. Sombra came back in a female body, and it was a little tricky to fix it…”

“And by the time she figured out a fix,” Umbra cut in, “I was actually fairly comfortable in this body.”

“It’s not a bad body, I must admit,” said Luna, muttering softly enough that only her sister could hear.

“Umbra’s role is more internal,” said Twilight. “She’s good at keeping track of money - and she’s partially responsible for reports on the various social classes are responding to the ongoing social changes. We’ve seen a lot of change in the last five years, quicker and more broad than Equestria has any precedent for.”

Celestia raised an eyebrow. “And you trust them with these tasks?”

“Oh, there’s loads of oversight,” said Twilight. “If they step out of line, they know what’ll happen.” She hopped down from the throne, casually strolling towards the sisters, the bulge of her cock and balls swaying beneath her dark dress. Anyway, I called them here for the second part of your makeover - a part I think you’ll enjoy!”

Twilight walked right up to Celestia - and the sight of her former student’s tits in her face reminded her of just how big Twilight had grown. Celestia was staring straight into the deep purple shadows of Twilight’s cleavage, and sight was… enticing. “A lot of ponies have had their bodies altered,” said Twilight. “The basic alteration, which is sort of required… or at least strongly encouraged… just makes your body more durable and stretchy. It’s a useful little enchantment, but the malleable body also creates the opportunity for more interesting changes.”

“So we can change our appearance?” asked Luna. “As you have done?”

“Not just me,” said Twilight. “This magic has been made available to all ponies, by mass-producing dark crystals imbued with changeling magic. But for you two, we can get that magic straight from the source. And you can look however you want. If anything about my body inspires you,” she said, shaking her shoulders to wobble her giant tits, “then feel free to copy off my work. I look forward to seeing what you come up with.”

“Oh my,” said Celestia, practically mesmerized by Twilight’s breasts. “I wouldn’t really know what to say to that, Twilight. You may have cast off your modesty, but I don’t know if I’m ready to transform myself in that way.”

“Oh, that won’t be a problem,” said Chrysalis, taking a step forward. “Our magic changes you from within… and if you allow it to, it can reach your deepest fantasies. Whether you realize it or not, there is a perfect body that you desire… and if you just open your mind a bit, the magic will mold you into precisely that shape.”

“Yes, I think you’ll be happy with the results!” said Twilight. “And it’s nothing to be nervous about, Celestia. You’ll be in control the whole time, so it won’t go outside your comfort zone.”

“Well… I suppose I do need to fit in with this new world,” said Celestia. “Very well. Change me.”

Twilight stepped back, and Chrysalis and Umbra stepped forward, until all of them were giving Celestia a good five feet of space. Chrysalis and Umbra activated their magic, both sending a flare of energy into Celestia’s body. As the magic hit her, she noticed a change in her body… it felt looser, and she felt instinctively that she could mold it into a different shape with nothing but her will. Her clothes faded into nothingness, and she was a bit surprised to find herself naked… but the feeling in her body was so good, and so comfortable, that it didn’t bother her.

“Why don’t you talk us through your thought process, Celestia?” asked Chrysalis, running her tongue over her lips. “Let desire bubble to the surface… and fearlessly tell us what you want to become.”

“I’d like to be… taller… like Twilight,” said Celestia. “I always liked being the tallest pony around.” As soon as she spoke, she felt herself growing, her body stretching upwards. “Oh, that feels good…”

“It always feels good to get bigger,” said Chrysalis. “Surely that’s not all you want, is it? The spell can make you grow much more.”

“Well, as long as I can have whatever I wish,” said Celestia, “Perhaps a little more muscle definition?” Muscle firmed up all over her body; up and down her arms and legs, toned muscle formed beneath the skin. Biceps swelled, thighs widened, and her smooth belly grew a set of six-pack abs... and between her height and her muscle, she was every inch an amazon.

“Please tell me you want those tits to grow,” said Chrysalis. “You’ve got a great rack, Celly, but they’re pretty shrimpy by modern standard. I want to see those boobs inflate like hot-air balloons.”

“Oh, you want to see these beautiful milk-white breasts blossom into gorgeous globes, changeling queen?” said Celestia, meeting Chrysalis’ eyes. “Well, you’re in luck… Twilight’s tits looked so good, I knew I had to get a pair of my own…” Her breasts grew larger, staying firm but sinking lower as they swelled past cup size after cup size.

“And all this talk of mares with cocks,” continued Celestia, “it sparks a fire in one’s imagination…” From above her pussy, a cock sprouted, along with dangling white ballsack. As it grew, it paused briefly at ten inches - a size at which it looked reasonably proportioned on her amazonian body. She reached a hand down, feeling the smooth flesh of her flaccid shaft, and gasped in pleasure. “Oh, that feels wonderful,” she said, as the growth resumed. “I need to be bigger…”

“Wow,” said Chrysalis. “I was hoping I’d see you grow a nice thick cock, Celestia, but I was expecting I’d have to talk you into it.”

Celestia grinned at Chrysalis, gripping her cock in one hand. By now it was fifteen inches long, and big enough that her fingers couldn’t close around it. “Oh, you were looking forward to this, were you? I wonder why…” She wrapped her other hand around the base of her shaft, stroking it as it grew. “Tell me, did you imagine how it would feel to hold it in your hands? To caress the tip with your tongue?” A surge of growth made it long enough to dangle past her knees, and still it kept growing. “When you imagined getting fucked by the lovely sun princess, how big did you wish for my cock to be, Chrysalis? Because… the more I grow, the more wonderful it feels… I don’t know when I’ll feel like stopping.”

True to her word, Celestia let herself grow bigger and bigger, her marble-white cock growing and thickening inch by inch and foot by foot. The tip of her cock hit the floor and kept growing, snaking in Chrysalis’ direction as it lengthened. It swelled wider than her muscular thigh, then wider than her waist, then bigger around than her gigantic bust.

And as it grew, it stiffened, rising from the floor. Celestia shuffled her feet apart, making space for balls that were now bigger from her tits and hanging down to her ankles. Chrysalis stared wide-eyed at the giant shaft that was growing in her direction, rising higher until it pointed right at her crotch. “Woah,” she said, “Celly, you’re huge.”

“Not huge enough,” said Celestia, now stroking as much of her cock as she could reach. “Don’t you want to see this cock grow even bigger?”

“Geez, Celly, you’re going nuts, aren’t you?” laughed Chrysalis. The three-foot-thick head of Celestia’s cock was closing in on her, and she intercepted it with both hands, wrapping her slender black fingers around its rim and walking backwards as it continued to grow longer. “I think… Twilight, is this the biggest dick in Equestria?”

“Not quite,” said Twilight, eyeing the huge shaft as it grew. Her own cock was slowly stiffening, lifting the front of her skirt. “Not… quite… but… Okay, now it is.”

“Oh really?” said Celestia, looking down the length of her nine-foot cock. “Well… perhaps I can stop there, then.” Her growth halted, and the loose feeling in her body went away as it settled into its new shape. “You were right, Twilight, this did improve my mood. Having the world’s biggest cock does wonders for one’s self-esteem. Although… I could see it being a bit impractical, swinging around an erection this large. Could my clothes perhaps be enchanted to manage its size?”

“Of course, of course!” said Twilight. “Luna, how about you?”

“Oh, I am more than ready,” said Luna. “I didn’t wish to pressure my sister, but I shared none of her earlier doubts. By all means, change me. I wish to grow.”

Chrysalis and Umbra nodded at each other and cast the spell again. Once her clothes disappeared, Luna started to grow taller and more curvaceous, her tits and ass getting wider and rounder at a fantastic pace. “Oh, I’ve seen this before,” muttered Umbra. “You’re a growth slut right from the word go, aren’t you?”

“What, are you afraid I will end up with a body that makes you jealous?” teased Luna. “Do not worry - I assure you that my form will drive you mad with envy and lust.” Her breasts grew until they hung down to her belly button, and then they stopped - but her ass kept right on growing.

Umbra watched Luna’s moons grow wider than her shoulders, scoffing in disbelief. “You’re going to have a hard time finding a place to sit, moon mare, if you continue to let your bottom expand like that.”

“Oh, I think I could find someplace comfortable enough,” said Luna. “Your face looks like an inviting seat…” She clapped her hands onto her immense asscheeks, and they began to grow faster. “Or perhaps I could grow so large that my bottom engulfs your entire body? Yes, that sounds like a lovely time…” she turned to Twilight. “Twilight, do I have the biggest rump in Equestria yet, or should I give it a few more minutes?”

“I’m pretty sure you’re the biggest,” said Twilight - and Luna, now sporting an ass almost as wide as she was tall, stopped growing. “Umbra’s right, though. Chairs might be a problem for you… doorways, too.”

“Perhaps my clothes could be enchanted to manage the size of my ass, then?” said Luna. “Speaking of managing things, Twilight, it seems that our changes have had a salutary effect on your mood as well.” She pointed a finger at Twilight’s dress, where the Queen’s cock was tenting the material something fierce.

“Yeah, after watching two of the hottest ponies in Equestria get even hotter, I definitely need to drain my balls,” said Twilight, reaching down to grope herself. “Fortunately, I have someone on staff to help me deal with that. Barb?”

Twilight spoke the word “Barb” into the empty air, barely raising her voice - but there must have been some kind of magic that caused the request to hit the proper ears, because not five seconds later a door in the back wall of the throne room opened up and a purple-and-green dragoness entered the room.

“Spike?” asked Celestia. The dragoness was fully grown, with scaly cleavage peeking out from a white button-down shirt, emerald eyes behind a thin pair of spectacles, and luscious legs beneath a short black pencil skirt… but it had to be the same little dragon Celestia knew from before.

“Princess Celestia!” said the dragoness excitedly. “Princess Luna! It’s so good to see you! It’s Barb, now, actually - my name, I mean…” She walked towards the sisters, ready to embrace them… but Twilight grabbed her by her shoulder, bringing her to a halt.

“Did you forget?” said Twilight, leaning down to bring her lips right to Barb’s ear. “They’re not princesses anymore. The only royal in this palace is Queen Mommy. And Queen Mommy needs to empty her balls into her sexy secretary…”

“Sure thing!” said Barb, tugging down her skirt and falling to her knees. “I bet you’ve got a pretty big load for me, if you just watched Celestia and Luna transform. Luna, you’ve got an incredible butt now, and Celestia… I’ve never seen a cock so big!”

“Only one cock you need to concern yourself with now,” said Twilight. With a flicker of magic from the tip of her horn, her clothes vanished - and it seemed that her clothes had possessed the cock-minimizing magic that Celestia had requested, because the hard dick that sprang forth was a good five feet long. “Your mother’s cock is nice and hard, and her balls are bursting with cum… and she needs you to take every drop for her.”

“With pleasure!” said Spike, unbuttoning her shirt and exposing her scaly tits. “By the way I’ve got a date with Ember this evening… but I have plenty of time for you, mom.”

“Goodness,” said Celestia, seeming uneasy. “It did always seem to me that you had a maternal relationship with… Barb. And I wouldn’t expect that that would go in a… sexual direction.”

“Oh, right, I suppose this would be a surprise,” said Twilight. “Sorry, this is just such a normal part of my day that I didn’t think anything of it, but this is as good a time as any to explain this…” She stood several feet behind Barb, who was waiting in a doggy-style position on the throne room floor. “A lot of sexual taboos have been broken down lately. Basically anything two consenting adults want to do with one another is fine… the rise of sexual satisfaction has led to generally healthier relationships, even if some of them are what you might consider unconventional.”

“I suppose you know what’s best for yourselves,” said Celestia.

“We do,” said Twilight, easing her immensely thick cock into Barb’s pussy. “That’s why I’m Queen Mommy. Because I know what’s best for my girl…” Barb’s body visibly stretched as she was penetrated, her hips and then her loser torso growing wider as the monstrous cock slid further into her. “You like your mother’s big hard cock, don’t you, Barb?”

“Yes,” groaned Barb, rolling her hips and clawing at the floor as Twilight embedded another foot of mare meat into her pussy. “Yes, I love your cock, mom… please give me all of it, please fuck me as hard as you can…”

“Mmm, you love to get fucked, don’t you?” said Twilight. “Like mother, like daughter… there’s nothing you love more than a big hard cock deep inside you…” She pumped her hips, driving her cock deeper into Barb’s body, and each stroke was harder and faster than the last.

“Fill me, Queen Mommy!” cried Barb. “Give it to me harder, please, fuck my hot little dragon pussy…” Twilight’s thrusts hammered Barb’s body, and Twilight’s cock stretched her torso all the way to her shoulders.

“That magic really does make ponies stretchy, doesn’t it?” said Luna. “I can’t wait to try that out for myself.” She took a seat on the floor - which, given the size of the butt she was sitting on, left her nearly as tall as she was when she was standing.

“I hadn’t expected her to be quite so rough with Barb,” said Celestia. “That looks like decidedly… angry sex.”

“Oh, that’s normal,” said Chrysalis, sidling up to Celestia. “They both like it rough… and a quick, hard fuck saves time when Twilight just needs to empty her balls. Usually takes a while for her to blow her whole load. And judging by that nine-foot-long boner you’re still swinging around, you don’t mind what you’re seeing.”

“I never it was a turn-off,” said Celestia. “I think I’m starting to understand what it feels like to need one’s balls emptied…”

“I know my way around a giant cock,” said Chrysalis, grazing her fingers across the skin of Celestia’s shaft. “If you’d take me on a date, Celly, I’d show that meaty monster a very good time.”

“You?” said Celestia, slapping Chrysalis’ hand away. “After spending five years away from Equestria, you think you’re the one I want to spend time with? The woman who infiltrated my castle, let an invasion of my city, and tried to strike me dead?”

That was precisely the reaction Chrysalis had expected; she’d only asked because she wanted an opportunity to antagonize her old nemesis. Still, Celestia’s tone had been a little hurtful. “Well, if you didn’t want to, all you had to say was-”

“I’d love to.”

“Uh… whuh?”

“Sounds like fun,” said Celestia, with a confident smile. “If you’re free in a couple hours, come by my room.” She turned her eyes back towards Twilight and Spike, whose intense lovemaking was reaching a fever pitch.

“Queen Mommy’s gonna cum,” grunted Twilight, ramming four feet of thick purple cock into Barb’s absurdly stretched pussy. She had Barb’s scaly purple butt clutched in both hands, and her colossal tits rested on the dragoness’ back, jiggling violently with each hammering thrust. “Do you want it, Barb darling? Do you want your mom’s big hot load?”

“Yes,” moaned Barb. “Please fill my pussy, Queen Mommy, make me big, fill me up with your cum…”

Twilight shuddered, hilting her cock in her dragon daughter’s cunt, and an audible liquid gush erupted from her cock. The first shot of cum was huge; Barb’s tummy instantly bloated so big that it lifted her hands and knees off the ground. The next burst inflated Barb’s wobbling belly even further, so big that Twilight had to stand up in order to keep her cock embedded in Barb’s pussy.

Luna and Celestia watched wide-eyed as Twilight and Barb rose higher atop Barb’s cum-filled tummy. Chrysalis and Umbra watched the spectacle with interest, but didn’t seem quite as impressed; no doubt they’d seen the same thing plenty of times.

“That is… quite an impressive load,” said Luna, caressing her inner thigh with the fingers of one hand. “Is that typical?”

“Yes, it’s always like this,” said Umbra. “A load this big doesn’t serve much of a practical purpose, but Queen Twilight enjoys being potent… and a long climax is her favorite way to unwind.” Stepping closer to Luna, Umbra laid a hand on the wide expanse of her huge blue buttocks. “How do you like to unwind, Luna? Perhaps I could show you a good time in the new Canterlot.”

“You saw Chrysalis asking my sister on a date, and you had to try your luck, eh?” said Luna. She shook her hips, making her bottom jiggle. “Sorry, but I would rather spend an evening with a manticore than with a tyrant. It’ll take far more than a pair of tits to convince me that you’re worth my time.”

“Come now, Luna,” said Umbra, grabbing a handful of jiggling blue butt-cheek. “You know better than anyone that dark hearts can be reformed. Just what are you afraid of, moon mare?”

“I am certainly not afraid of you,” spat Luna. “Reformed or not, you are Twilight’s lapdog now, Umbra.”

Umbra scowled. “I see how it is,” she said. “We are similar, aren’t we, Luna? Both exiled, displaced in time… I think you’re afraid that I’ve adjusted to this new world better than you have. What if Luna is still awkward and unloved, and Umbra is a cherished pillar of the community? Being seen in public with the long-absent moon princess might hurt my sterling image…”

“Do you honestly think the ponies of Canterlot-” Luna snorted indignantly. “Very well, the two of us shall step out together, and we shall see-”

“Great!” said Umbra, giving Luna a hearty slap on the behind. “I’ll come by your room later today, Luna. Wear something pretty.”

Luna was gasping - first, because having her bottom spanked was surprisingly pleasurable, and second because she realized she had just agreed to the date she had tried to turn down. “Umbra-” she sputtered.

“Don’t worry, it’ll be a good time,” said Umbra. “Now why don’t we all take a seat? Twilight enjoys being watched, and she won’t stop coming for quite a while.” Magic flared on her horn, manifesting three comfortable-looking chairs… and one wide couch. “For your incomparable rear, Luna darling,” said Umbra, gesturing towards the couch.

Each of them took a seat, watching Twilight bloat her number one assistant with gallons upon gallons of spunk. Barb’s belly was ten feet wide and still growing with each gush, rising towards the ceiling as Twilight’s bottomless balls fired off their immense supply of hot spunk. The other ponies chatted with each other, marveling at the endless orgasm. Celestia’s cock never went down; as she watched Twilight inflate Barb, her nine-foot boner fired off the occasional gallon or precum onto the throne room’s carpet.

It was almost a half hour before Twilight stopped coming, and by that time Barb’s cum-swollen tummy was taking up about half the throne room’s floor space. Sighing with satisfaction, Twilight dragged her cock out of Barb’s pussy and collapsed onto the dragon’s belly like it was a waterbed.

“Twilight, that was remarkable,” said Luna, standing from her couch. “Is that truly a typical sexual release for you?”

“Well… that was just round one,” said Twilight. She rolled over, displaying her slick - and still fully hard - cock. “It’s going to take a while before these nuts are properly drained. Chrysalis, Umbra, why don’t you take the two of them back to their rooms? It was nice having an audience, but I don’t want to hold you captive all day.” She walked across Barb’s belly, her feet sinking into the scaly blob with each step, until she arrived at the dragoness’ mouth. “Open wide,” said Twilight. “Queen Mommy has a meal of hot creamy cum for her good dragon girl…”

Barb opened her mouth as wide as she could - and then her jaw stretched much, much wider as Twilight shoved her cock down her throat. Celestia and Luna took one last moment to marvel at the sexual spectacle, then followed Chrysalis and Umbra out the door.

Chapter 3

“We two are sharing a room?” asked Luna. “I know we are no longer princesses, but surely our demotion is not this precipitous.”

“No, you’re keeping your rooms,” said Umbra. “If I were in Twilight’s place I certainly wouldn’t miss an opportunity to demean the former rulers of the nation I now ruled… but kindness is the tool Twilight favors, and I must say it has a keener edge than I would have imagined.”

“I’m sure Twilight wanted to have your rooms clean when you arrived,” said Chrysalis, “but the cleaning staff had a lot of work this week, and... “ she pushed open the door to the bedroom. It was lavishly outfitted, with purple sheets and curtains the evoked the colors of Equestria’s new queen. “Well, it’s a really nice bedroom, all right? So deal with it.”

“My sister and I aren’t germophobes,” said Celestia, as she stepped inside the bedroom. “We both like our bedrooms, and if they’re not tidy… I think we’ll manage regardless.”

Chrysalis laughed. “Oh, no, that’s not quite the issue,” she said. “Y’see, Twilight sometimes hosts… how should I put this? Theme parties. In your old bedroom.”

Luna, making herself comfortable on the bed, gave Chrysalis a quizzical look. “Theme parties?”

“Yeah,” said Chrysalis. “I was the star of the show, actually! I got so, so good at my Luna impression. Here, I’ll show you.” Green fire raced from her horn down to the soles of her feet, and standing in her place was a double of Princess Luna - only this one was completely nude.

“Thanketh you so much for attending my private lunar gala!” said the double, arching her back to make her breasts bounce. “Now, all of you, please - cummeth upon my tits!”

Celestia’s jaw dropped, and she rubbed at her eyes with both hands, looking between Luna and her doppelganger with an expression of mock bewilderment. The real Luna just rolled her eyes and addressed Umbra. “So my bedchamber, and my sister’s, are… thoroughly coated in cum?”

“Yes,” said Umbra. “The castle’s staff has lots of experience cleaning up huge quantities of cum, but your rooms aren’t ready right at the moment. Anyway… I’m sure the two of you want to pretty yourselves up for our date, so Chrysalis and I will give you some time to yourselves. Chryssi?”

The false Luna turned back into the Changeling Queen, and she and Umbra made their exit.

“So what do you think?” said Celestia, dropping onto the bed beside her sister. “Of all of this? This whole world that Twilight Sparkle has created.”

Luna was silent for a short time, her face unreadable as she considered the question. “It is… far, far more sexual than we would have imagined,” she said. “We would go so far as to call it ‘perverted.’ And yet… we can scarcely dispute that Equestria is better in all the ways that truly matter.”

“Exactly my thinking,” said Celestia. “This, I suppose, is what you get when everyone is free to pursue their desires, freed from limitations. The fact that most ponies have chosen to be mares is something of a surprise, though not an unwelcome one. The larger surprise, to my mind, is how much Twilight herself has embraced and promoted this heightened state of sexuality. I worked closely with her for many years, doing my best to learn everything I could about her… and I would never have guessed that she was concealing such intense and unconventional desires.”

Luna nodded. “I suppose it is always the quiet ones who are the most perverted,” she said. “Do you suppose-”

But as she turned to face her sister, her mouth was stopped by Celestia’s lips - and then her tongue, which probed Luna’s mouth with a voracious energy. Luna was shocked, her eyes wide, but she didn’t pull away - she just let her sister plunder her mouth and exhale hot breaths onto her face and lower her onto the bed. Luna lay there, letting herself be taken by Celestia’s sudden passion, until her sister suddenly broke off the kiss and lifted herself up, leaving Luna prone on the sheets with the ghost of that kiss on her lips. “Tia?” she said softly. “Why…”

“Well, I was just thinking,” said Celestia casually, “that we are surrounded by ponies who are… more accustomed to this world than we are. We need to catch up, Lulu. That means forgetting about the limitations that we once thought bound us. I am sitting next to a beautiful mare with a gorgeous starry mane and a big round butt, and I thought to myself that I should kiss her. After watching you transform… seeing Barb fucking Twilight Sparkle… and, of course, not having sex anytime in the last thousand years… I'm just disgustingly horny. I think it’s time for me to do what I feel like doing.”

Luna’s face slowly cycled through expressions. “We are sisters, though…”

“We are grown mares,” countered Celestia. “And with so many taboos erased, there is no one to tell us we cannot love one another. And let me ask you, sister… why did you not resist?”

Luna was in thought only for a moment this time before coming to her decision. She tackled her sister, pushing her down onto the bed and locking lips with her. Luna seemed intent on outdoing Celestia's kiss, pushing her tongue past her sister’s lips and tackling her onto the bed. Celestia was buried beneath Luna’s body, smothered by her tits, embedded in the mattress by the weight of her giant butt. Even though her butt was magically compressed by her dress, it was still enormously wide and heavy… and as the two sisters embraced, writhing and moaning, that weight pressed down on Celestia’s crotch.

Celestia’s cock, like her sister’s ass, was magically compressed by the dress she wore… but it was still bigger than any pony’s cock had been in the days before Queen Twilight. And now, with Luna’s tongue in her mouth and Luna’s tits pressing against hers, Celestia’s cock was rising, thickening, growing stiff. She gyrated her hips slowly, rubbing her shaft against Luna’s body, delighting in the magnificent sensation of growing bigger, bigger, bigger. She felt her nuts sloshing with seed, her cock growing hot and pulsing with arousal, thick precum shooting in globs from the flared tip. She was ready to go all the way - to tear off her dress, fuck her sister, and bloat that beautiful midnight-blue body with cum.

“Well, that didn’t take long,” said a voice from the far side of the room. The sisters were almost too lost in lovemaking to bother looking up, but the presence of observers in a room they’d assumed was private… well, that was fairly alarming. They pulled themselves apart, standing awkwardly from the bed and turning towards the source of the familiar-sounding voice.

The source of the voice was a pony near the bathroom door, a sky-blue mare with an athletic build and powerful wings folded behind her back. She was bigger than either Celestia or Luna remembered, with a far larger bust and wider hips, though her toned muscles still stood out beneath the skin. But she was still the Rainbow Dash the two of them remembered.

And next to her was another familiar face. Another villain, albeit one reformed for longer than Umbra or Chrysalis had been. Tempest Shadow had received the same upgrades to her curves as Rainbow Dash, but there was a more interesting change as well: underneath a pair of shiny black panties was the irregular bulge of a fat cock and balls, growing and shifting as Tempest developed an erection.

“What are you two doing here?” demanded Celestia, folding her arms self-consciously in front of her chest. She glanced down at her cock, which was prominently tenting her dress, but there wasn’t much hope of hiding it… and besides that, she wasn’t actually ashamed of what she was packing down there. It was damn big, and when its size wasn’t being suppressed it was literally the biggest cock in Equestria.

“Well, we were hoping to run into you,” said Rainbow Dash. She leaned on Tempest, running her hands over the growing bulge in the other mare’s panties.

“You don’t like being watched?” said Tempest, with a thin, confident smile. “ That’s another taboo you should try and push past, girls.”

“And if it’s the incest thing, don’t worry about that,” said Rainbow Dash. “You’re two grown mares, like you were saying. You can make your own choices, and if your choices involve Celestia’s huge cock and Luna’s fat ass, I’m behind you a hundo percent.”

“That’s lovely to hear,” said Luna flatly, not seeming especially comforted. “But why are you in the guest room that was set aside for Celestia and myself?”

“We go where we like,” said Tempest. “And we wanted to meet you upon your return, after you had a chance to speak with our wife.”

“Your wife?” asked Luna, mentally going over the brief list of ponies they’d met since they came back to the castle. It really could be anyone, since ponies could probably have as many wives as they liked in Queen Twilight’s Equestria...

“Aww, she didn't mention us?” asked Tempest. “I guess there was a lot to talk about… anyhow, we’re Twilight’s wives.”

“Yeah, both of us!” said Rainbow Dash, still groping the bulge inside Tempest’s black panties. It was still uncoiling, thick as her arm and well over a foot long. “It was kinda rough going at first… Twilight made this really deep connection with Tempest during the whole Storm King thing, but the two of us really didn't get along at first…”

“Luckily,” said Tempest, “Twilight’s rule ushered in a lot of new ways for people to connect sexually. Now I love Dashie just as much as I love Twilight.”

“Same here,” said Rainbow Dash, giving Tempest’s cock a playful squeeze. “I love myself just as much as I love Twilight!”

“So… both of you?” asked Luna. “How does that work in the, er, bedroom?”

“Well, we’re hardly the first ponies to have three-ways,” said Tempest. “But Rainbow Dash and I have something special we do.” She and Dash shared a smile, meeting each others’ eyes, and then they spoke together: “Why don't we show you?”

Rainbow Dash reached into Tempest’s panties and pulled out her cock, a mouthwatering eighteen inches of purple stallionhood. With another motion of her hand, Dash pulled out Tempest’s fat, dangling nuts and tugged her panties down enough that they dropped to the floor on their down. Then she turned to Luna and Celestia and raised an eyebrow expectantly, ogling the former princesses’ bodies as she handled her lover’s cock.

Luna and Celestia took the hint. The two of them helped the other disrobe - Celestia slipped Luna’s dress off her shoulders and pulled the fabric away from her tits - and when the dress fell away from Luna’s butt, her cheeks ballooned enormously, returning to the colossal proportions that Chrysalis and Umbra enlarged them to. Rainbow Dash and Tempest gasped in awe at the sight of it; it was the biggest ass in Equestria, after all. They’d never seen a butt that big, even in Queen Twilight’s new world.

And Celestia could be equally confident that they’d never seen a cock as big as hers. When her own dress fell away from her body and its magic no longer compressed the size of her cock, Celestia’s shaft sprang forth, fully hard, shooting forward over the marble floor, audibly groaning as it grew to its full length - ten feet long, three feet wide.

“Holy shiiiit,” gasped Rainbow Dash, licking her lips as she beheld the enormous, snow-white shaft. Her eyes caressed its curves and ridges - its colossal girth, its bulging veins, its wide flare and thick medial ring. “How’d you get a cock like that?”

“I suppose Twilight was grateful that Luna and I indulged her little experiment,” said Celestia, waggling her hips so that her enormous tree-trunk dick waved back and forth. “I wanted the biggest cock in Equestria, and my sister wanted the biggest ass… so we got them.”

“Well, that’s pretty cool,” said Rainbow Dash, “but wait til you see what we can do!”

Rainbow Dash drew a breath - and kept on breathing in, much longer than should have been possible. Long after her lungs were full, she continued to inhale… and that air began to fill other parts of her body. Her breasts began to swell, as if the air was filling them… and then her hips started to grow as well, blowing up like balloons as Dash breathed in more and more. She was even growing taller, her body stretching upward, groaning and creaking as she expanded. Her athletic figure grew into a deliciously curvy hourglass, expanding and climbing higher until she was nearly the equal of Princess Luna.

And even then, Dash didn’t stop… but now the excess air was flowing into her stomach, making her belly swell up. She looked as though she was rapidly progressing through a pregnancy, arriving at nine months within seconds… and she kept on growing, her belly growing like a balloon, outgrowing her butt, expanding two feet, three feet, four feet in front of her body. Laughing, Rainbow Dash fell forward, landing on her swollen belly, bouncing a bit before settling on the marble floor. Her stomach continued to grow until nothing else touched the floor but the tips of her toes.

“That’s really something, isn’t it?” said Tempest, stepping forward and lowering the tip of her hard cock so that it was level with Rainbow Dash’s lips. “I just adore the way she grows right before my eyes… but I like this part even more.”

Rainbow Dash opened her mouth, extended her tongue, and took the flare of Tempest’s shaft into her mouth. Dash began to exhale, and her belly began to decrease in size. All that air traveled down the shaft of Tempest’s dick, and it began to fill her up - but not in exactly the same way it had filled up Dash. Like Rainbow Dash, Tempest started to grow taller, but she didn’t gain the same outrageous curves. Instead, her muscles bulged, becoming bigger and more defined. Her breasts and her ass stayed in proportion to her growing body, but her cock and balls expanded much faster than the rest of her. Her whole body creaking and groaning with growth, her thick purple cock swelled and lengthened. It grew by inches, then by feet, forcing Tempest to slowly walk backwards. Her purple nutsack grew past her knees, then landed on the marble at her feet, making her gasp slightly as she felt the cold on her skin.

Rainbow Dash emptied all the air in her belly, until she lay tits-down on the floor. And Tempest, thanks to her gift of breath, was almost as monumentally endowed as Celestia herself. Her nuts were every bit as big, and her cock, at nine feet, was just a foot shy of the former princess’.

“That’s what we call a ‘blowjob’ around here,” said Tempest, stroking the base of her giant cock with both hands. “But, uh, we still do the regular kind of blowjobs, if that’s more your thing.”

“We got rubber bodies!” said Rainbow Dash proudly, as she stood up from the floor. “Well, sort of. We wanted to be stretchy and inflatable, and Twilight and Tempest sorta figured out how to make the magic part happen. Stretchy skin that works like a balloon… there’s tons of fun stuff we can do with bodies like these!”

“And we aren’t the only ones who’ve been growing,” said Tempest, waggling her finger in the sisters’ direction.

Celestia and Luna’s eyes had been glued to Dash and Tempest’s erotic inflation, but now they looked at each other and down at themselves. They hadn’t realized it at the time, but now there was no denying it - they were both bigger.

“Looks like you both picked up about six inches of height,” said Tempest, squinting as she evaluated them. “And corresponding growth in your busts… And big gains in Luna’s big fat ass and Celestia’s monster of a cock.” Tempest took a couple steps, moving with ease and grace despite her dragging balls and her nine-foot-long penis, and nudged the head of Celestia’s cock with the tip of hers. “It can be a little odd, growing that way,” she said. “It feels like becoming aroused, but a great deal more intense… I’m sure you’ll get used to it, though. And you’ll definitely come to enjoy it.”

“I imagine that we will,” said Luna. “And sister, there’s no reason to let those two have all the fun with their wonderful bodies when the two of us are even bigger.” She straddled her sister’s cock, facing away from her - which put her tremendous ass right in Celestia’s face. “I have to say, I’ve had quite enough of just looking at your big, beautiful cock,” said Luna. “I am ready to do something to it.”

Luna lay herself face-down on top of Celestia’s cock, nestling the thick shaft between her tits. A three-foot-wide cock would make a boobjob impossible for most ponies, but Luna was no ordinary mare. Her cleavage was big enough to engulf her sister’s shaft, and once she had that giant cock between her pillowy blue tits, she began to rock back and forth. Celestia groaned in bliss as Luna’s tits pleasured her cock - and on top of the boobjob, she also had her sister’s colossal rump bobbing up and down in her face. She stretched her arms out, letting her hands sink into the soft, jiggling flesh, and joyously groped the world’s widest butt.

“Ahh, Luna,” sighed Celestia, “This is… heavenly… Oh my stars, this is absolutely worth losing the throne of Equestria.”

“I am inclined to agree,” said Luna. “Without Queen Twilight, you would never have a cock taller than your body… and your sister would not have tits big enough to embrace it. I am not even the one being pleasured, and I am still enjoying this greatly… it seems my breasts are powerful erogenous zones… And if I am being candid, Tia, I must admit that I have dreamed of doing just this sort of thing with you.”

“And I’ve dreamed of having a cock,” Celestia admitted. “Never one this big, even my wildest dreams. But you were always in those dreams, and I always woke up quite wet…” Her cock bucked, making Luna’s whole body jiggle. “Ahh, it won’t be long before I cum,” groaned Celestia. “Oh Luna, I can tell it’s going to be so big…” Her tip was already oozing precum, spilling a half-gallon of spunk with each gentle throb of the giant shaft.

“You know, we’re not actually done,” said Rainbow Dash, taking a seat on an unoccupied portion of Celestia’s dick. “Trust me, it’s worth the wait. Let us do our thing, and you’ll be shooting a way bigger load when you finally get your rocks off.”

“Well, I am certainly curious,” said Luna, slowing the pace of her titjob. “Sister?”

“Oh, all right,” groaned Celestia. “But don’t stop, Luna. Equestria’s largest cock can only wait so long...”

“All right, then!” said Rainbow Dash, placing her hands on Tempest’s flare. You ready to blow their minds and their loads?”

Tempest smiled. “You know it, love.”

Before the curious eyes of the two sisters, Rainbow Dash crouched and pressed her face up against the head of Tempest’s cock. At first, it seemed that she was merely going in for a kiss… but after her lips met Tempest’s huge slit, she kept on going. She sank her face into the hole, then her entire head. She paused there, neck-deep in Tempest’s cock, and Celestia was just about to ask what she was doing… when Tempest’s dick made a loud wet slurp and began to suck Dash’s body further inside.

“Ahh, yeah, get in there, Dashie,” groaned Tempest, as her cock engulfed Rainbow Dash’s shoulders. “Let my big cock just swallow you up…”

“What are you doing?” asked Luna, tilting her head as she kept up her boobjob. “I think perhaps I like it, but… I am not sure what I am seeing.”

“It’s exactly what it looks like,” said Tempest. “I'm… eating Rainbow Dash with my cock. It's, uh… oooh…” She paused to moan and shudder as her cock widened to swallow up Dash’s tits. The big purple cockhead bulged hugely, slurping its way around Dash’s huge bust, and Tempest sighed with satisfaction she swallowed Dash up to her slim belly. “It’s just step one…”

Tempest moaned and clutched herself as her shaft widened to swallow up Rainbow Dash’s enlarged bottom. Her ass was a great deal wider than her bust, forcing Tempest’s cock to grow much bigger in order to swallow it. The shaft bulged with the shape of Rainbow Dash’s wriggled curves, slowly sinking towards Tempest’s body - and then, when her ass was completely swallowed up, the rest of her disappeared almost instantly with a sudden slurp. Her curves slithered down Tempest’s shaft - and when it reached the base of her cock, her purple balls rapidly swelled, doubling in size as they absorbed Dash’s body.

“What… what just happened to Rainbow Dash?” asked Celestia, breathless from the ongoing boobjob and the strangely arousing sights in front of her.

“I just swallowed Dashie up,” said Tempest, “and now she’s a big blue load of living cum, deep in my big fat nuts…” She dug both hands underneath her dick and lifted it towards her face. It was still soft, somehow, and she was able to bend it towards her mouth… and then shove it past her lips, into her wide, yawning mouth. Letting out a long, muffled moan, she fed her long, thick cock into her mouth and down her throat, where it bulged prominently from her belly.

“Such a strange display,” groaned Celestia, her face half buried in her sister’s wobbling asscheeks, “but it’s… fucking hot…” Her cock trembled between Luna’s tits, and she heard a thick sloshing from within - then, with a jolt, the immense shaft began to spray cum like a firehose, shooting thick white cum across the room and splattering the far wall with a dripping layer of spunk. Moaning, her cock bucking under Luna’s body, she fired off load after load, coating more and more of the walls and the floor. Celestia’s cock started to rise, effortlessly lifting the weight of Luna’s body, and began to shoot cum unpredictably, firing loads of spunk that arced towards the ceiling and coated everything in the room. The bed, the dresser, and the marble floor disappeared under a shower of cum, leaving everyone up to their ankles in jizz.

“Celestia!” said Luna, once the cock underneath her stopped spurting. She leaned her head down to lick some cum off the veiny shaft she was riding. The taste was divine, rich and salty and sweet, and she swallowed it down hungrily. “That was so… powerful… I see now why our bedchambers needed such a thorough cleaning.”

“No, that was… just precum,” Celestia groaned. “I can feel so much more, still inside me…”

“Are you serious?” gaped Luna. “I suppose I must keep working to make you cum, sister…”

The knowledge that Celestia was holding in an even bigger load also seemed to have an effect of Tempest. Her cock, still deep in her belly, trembled with arousal and then began to chug, pumping a huge load into Tempest’s gut. Her stomach started to swell, bloating much the same way that Rainbow Dash’s had… but she was filling herself with thick cum, living cum, a liquid that used to be Rainbow Dash. The vast majority of it stayed inside her, but a few trickles of fluid escaped her lips; the fluid, Luna and Celestia couldn’t help but notice, was a liquid rainbow, dripping down Tempest’s chin in a play of vibrant, shifting colors.

But before it could drip too far down, purple light began to erupt from her body. Blinding light coated her skin, turning Tempest into a radiant body too bright to see clearly. When the light faded, someone new stood in Tempest’s place. Someone big - a navy-blue mare who towered over the sisters at eighteen feet tall. A mare with a messy mohawk that looked like a dark rainbow, with powerful wings and a long - but still broken - horn on her forehead.

This new mare - this alicorn - was an awe-inspiring amazon. She was Celestia’s superior in every sense - bigger muscles, a thicker ass, and rounder tits. And her stallionhood was godlike, so long that its girthy, veined length coiled on the floor. Her nuts dragged on the floor, audibly churning with spunk as she looked down at Luna and Celestia.

“Oh.. oh my… what just happened?” asked Luna, staring disbelievingly at the giantess in their midst. “Who are you?”

“I’m pretty much what I look like!” said the alicorn, flipping her mohawk in Luna’s direction. “Half Rainbow Dash and half Tempest Shadow. I call myself Fast Temptation, but you can call me your big-dicked sex goddess.”

“You are... breathtaking,” sighed Celestia. “I think… I think I can feel myself growing again…”

“Yeah, it’s a unique feeling, huh?” said Temptation. “You see a mare like me, and your body wants to rise to the challenge… and that means getting big.”

Celestia’s body groaned with expansion, muscles creaking and balls sloshing as she grew. Her body stretched in every direction, spreading across the floor, sending ripples through the pooled cum. Her cock extended and thickened, veins bulging and pre shooting across the room.

Luna, still riding her sister’s swelling cock, also surged with growth. Like Celestia, she grew taller - but her colossal tits and immense ass grew even faster than the rest of her, ballooning rapidly as arousal coursed through her. She was holding onto Celestia’s cock, trying to ride it… but her growing body was unwieldy, and she slipped off, landing on her huge butt in the warm cum that coated the floor.

“Wow, I’m impressed,” said Temptation. She stroked her long blue shaft, and it writhed lasciviously as it uncoiled and rose from the floor. “The only reason I’m this big is that I’m two ponies. Not every pony can grow like that.”

Celestia now stood at seventeen feet, nearly the same height as Fast Temptation - and although she didn’t quite have Temptation’s amazonian musculature, she did have a cock of equal size. Luna was just as tall as Celestia, but she was face-down on the floor, pinned down by the weight of her curvaceous assets. “Ah, this is… impractical,” said Luna, swinging her arms and legs fruitlessly. “I’ve been immobilized by the greatness of my own body.”

“Oh dear,” said Celestia. “You’re helpless, sister.” She laid her hands on Luna’s ample bottom, groping her deep blue flanks and making her sister moan in blissful anguish. “A pony could just stroll right up and take advantage of you, and you’d just have to lie there and enjoy it…” She slid her cock into the crack of Luna’s ass, sliding it a couple feet deep into her bottom.

“Hmm, maybe being immobile isn’t so bad,” said Luna. “As long as there’s some hugely endowed mares to make sure I do not grow bored…”

“Looks like your sister’s got your pussy covered,” said Temptation, stepping forward with her navy-blue cock at full attention. “How about I fill your mouth?”

“That sounds magnificent,” said Luna, licking her lips and wiggling her rump. “I am powerfully worked up, and I badly need to be filled by the biggest, meatiest cocks I can find… and I want to feel what it’s like to be filled with a big, hot, sloshing load of cum, just like Twilight’s dragon girl…”

“You’re getting two loads, sister,” said Celestia, penetrating deep into Luna’s giant bubble butt and searching for the lips of her pussy. “And you’re getting them from bigger mares with longer cocks and much bigger nuts…”

“You’re going to be big, Luna,” said Temptation, teasing Luna’s mouth with the oozing tip of her cock. “Me and your sister are gonna shoot such big fuckin’ loads inside you, gonna fill you up bigger than any pony’s ever been…” She thrust her cock into Luna’s mouth, easily sliding the first three feet of her cock into her throat. Luna’s body accepted her immense girth easily; Chrysalis and Umbra’s magic had made her a creature capable of accepting any cock imaginable.

“I cannot wait to shoot my very first load,” sighed Celestia, as she slid her cock into her sister’s dripping pussy. “You saw how much pre I shot, and even that was such a glorious, blissful release… when I cum, it’s going to be absolutely heavenly… and I imagine your body is capable of just as much pleasure. I can’t wait to make you cum, Lulu…”

Temptation pushed her hips forward gradually, until the tip of her cock bumped up against Celestia’s. “Okay, there’s not quite enough room in your sister for both of us,” she said, “So we’re gonna need to fuck her with a rhythm, you get me? Try to keep up.” She pulled back, giving Celestia space to thrust - then, before Luna’s moans of pleasure could escape her mouth, Temptation thrust her cock down Luna’s throat, filling the space left behind when Celestia pulled out.

“Okay, lemme take the lead,” said Temptation. “A little faster every time we thrust… and soon we’ll be giving your sister the fucking of a lifetime.”

Celestia, though she’d never fucked anyone with a cock before - much less the biggest cock in Equestria - had a solid sense of rhythm and a natural grace, even in her new body. She followed Temptation’s lead expertly, going in when Temptation’s cock went out… and her body sang with pleasure as her long pearly-white cock slid in and out of Luna’s slick, tight pussy. “Luna,” she grunted, “It feels so good to fuck you, Luna. I never imagined anything could feel this good, but now that I am balls-deep in my sister’s tight pussy, I am… simply in heaven… Ohh, and Luna, this ass, this big, soft, delicious ass… you’ve grown so big, Luna, and you’ve never looked hotter…”

“You’re really losing yourself in this, ain’tcha?” laughed Temptation, her navy-blue nuts smacking against Luna’s chin as she thrust faster and harder into her mouth. “I guess I can’t blame you, since you’re a first-timer. Plus, your sister’s a great fuck. Second tightest mouth I’ve ever pounded, so I can’t imagine how good her cunt is.”

“The second?” gasped Celestia, meeting Temptation’s eyes. “Who is… the first?”

“Who else?” said Temptation. “My wife. The queen. Twilight loves to get fucked, and she’s always perfectly tight.”

“Yes, of course,” said Celestia. “I imagine Queen Twilight is looking forward to taking her turn with both of us… I imagine she wouldn’t grant us Equestria’s biggest cock… and its biggest ass… and not want to try them out.”

“Oh, she definitely wants to fuck her old mentor,” said Temptation, with a devious grin. “I don’t think that’s a secret. She’s wanted that since long before she was queen.”

Celestia lost herself, for a time, in the rhythm of sexual congress, trading turns with Fast Temptation as the two of them filled her sister with cock. After a while, her mind swam to the surface of her sexual reverie, and she met Temptation’s eyes. “Temptation?” she asked. “How long… does it usually take to cum? I keep getting more and more aroused… more tension in my cock and more sloshing weight in my balls… I feel like I’ve been fucking forever, and it feels great, but…”

“Heh heh, ponies like us are built for long fuck sessions,” said Temptation. “You know we’ve been going for like an hour already?”

“An hour?” said Celestia incredulously. “I don’t seem to have much of a sense of time…”

“Yeah, that’s happened to me too,” said Temptation. “Anyway, if you’re like me, you’re not even close to done. A cock like yours needs to fuck a tight pussy for hours before you can really cum. But trust me, babe, it’ll be so worth it.”

After that, Celestia’s mind dropped back into the senseless sea of bliss, and for two timeless hours there was nothing but the tightness of Luna’s slick, hot pussy and the meaty slap of Celestia’s fat white nutsack against Luna’s asscheeks. Then, after an eternity of pleasure, something changed inside Celestia; the tension in her cock, which had been rising and rising all this time… finally overflowed. With a sound like a violent, sudden storm, Celestia’s nuts sloshed and pumped the first immense gush of her hot, thick load.

Fast Temptation felt the flow of cum sloshing inside Luna, filling her body, and that sent her over the edge. With her cockhead pointed straight down Luna’s throat, she released her load, sending gallons upon gallons rushing into the other mare’s belly. And Luna - who had been going through the same unceasing rise in sexual tension as the other two mares - finally came as well, her pussy clenching mightily around her sister’s pulsing shaft.

Two minutes into her orgasm, Celestia wanted to ask Temptation just how long this was going to last… but she couldn’t find her voice, couldn’t use her mouth for anything but a series of wordless moans. Over and over, her cock pumped what felt like entire lakes of hot alicorn cream into Luna’s hungry pussy. And Luna was growing, swelling, ballooning with cum as she was filled from both ends.

After five minutes passed, Temptation slumped against the cum-bloated surface of Luna’s body, gasping for breath and purple-faced. “Holy shit, Celestia, are you still going?” she asked. “I thought my loads were massive! Damn, I wanna see how much you can fill your sister’s pussy. Go, girl, go!”

Still voiceless from the intensity of her orgasm, Celestia pumped her hips and dug her fingers into her sister’s pillowy bottom, shooting a ceaseless flood of thick spunk into her pussy. With every hundred-gallon spurt, Luna swelled bigger and bigger; her tits, ass, and belly got rounder and sloshier, spreading across the generous width of the guest room. She was increasingly a cum-balloon, her limbs and her head dwarfed into insignificance by her bloated curves.

Ten minutes into Celestia’s orgasm, Luna felt the walls of the guest room against her skin. All of the walls, the entire circumference of the room, was touching her - and her sister’s cock was still full-force pumping its hot load into her pussy. Her body still needed to expand, so it went upward, climbing toward the domed ceiling, progressively taking up more and more of the dwindling space in the expansive room. Luna felt Fast Temptation’s cock sliding out of her, making a pop as it cleared her lips, and she struggled to speak - although, like her sister, Luna herself was still in the midst of a colossal climax.

“Celestia,” she groaned, “Sister… fill me, make me bigger, I want to fill this room, I want to be a beautiful blob filled with your hot… white… cum…” More spunk, a rushing river of the wonderful stuff, flowed from Celestia’s slit, and Luna felt herself bloating even bigger, her immense ass and huge pillowy tits compressed against the wall as her body rose ever higher. She felt her wings touch the ceiling, and expected to burst through the walls at any moment…

And then the flow of cum slowed to a trickle - just a few gallons oozing from the tip - and then it stopped. “Fifteen minutes!” said Temptation. “Holy shit, Celestia, not fucking bad! I gotta tell Twilight about this!”

“Yes, I’m sure she’d… love to hear it,” said Celestia, her amazonian body pinned against the wall by Luna’s sloshing bulk. “But until Luna… recovers… I don’t think I can make my way out of this room.”

“Yeah, she’ll shrink in a bit,” said Temptation - who couldn’t see Celestia, as they were on opposite sides of Luna’s massively swollen body. “But for the moment, you’re probably stuck where you are. Me, though, I’m pretty close to the door… and it’ll be easier to wriggle out of here if I unfuse…”

Temptation’s body was engulfed in light, and when it cleared, two ponies wriggled their way down to the cum-splattered floor and edged towards the door that led out to the hallway. Once they’d freed themselves, Rainbow Dash and Tempest Shadow spent a moment fixing each other’s mussed hair and kicking the jizz off their feet.

“That was fun,” said Dash. “Awesome to have the princesses back, huh?”

“Absolutely,” said Tempest. “It might be a little while before anyone else can play with them, though… someone should tell Umbra and Chrysalis that they might be late to their double date.”