Her New Role

by Megapone

Rating: mature
Tags: Slice of Life, Anthro
Length: 15755

Twilight's coronation provided her with more than just wings: She also received a big (and growing) body, voluptuous curves any mare would kill for, and an entirely set of new genitalia. Oh—and a libido that's increasingly difficult to control.

Twilight's coronation provided her with more than just wings: She also received a big (and growing) body, voluptuous curves any mare would kill for, and an entirely new set of genitalia.

As her libido reaches a peak, Twilight struggles to control her new urges and associated growth spurts. With Rainbow Dash openly ogling her ass, and Twilight's crotch chubbing up at the sight of her friends' figures, though, keeping any sort of rein on her size and increasingly messy orgasms seems nearly impossible.

Will Celestia be able to help Twilight get a hold of herself? Or will she instead introduce Twilight to a role and perspective that she'd never considered before?

A commission for Borealium. Coverart by Suirano.

Published 1970-01-01 00:00:00 UTC
Last updated 2015-08-29 19:40:02 UTC

Chapter One

Twilight awoke to the sound of wood creaking.

She groaned, her voice muffled beneath the pillow on her face. She tugged it away, then yawned. She wiggled her toes, still half-asleep. Why did they feel so cold?

Her eyes, bleary with sleep, slowly began to close—and snapped wide open when she heard something crack beneath her. She made to draw her feet up toward her chest and gasped when she realized that they weren’t on the bed anymore.

She set them back down, then flinched when she felt the bed shake from the impact. What in Equestria—

She sat straight up and nearly yelped when she felt the ceiling brush against the tips of her ears.

“Oh, no,” she breathed. “This can’t be happening.”

But it was. Twilight held her breath as she glanced up at the ceiling to her room. It was now barely a foot away from her nose. And she was still sitting in bed. What the hay—

Then she glanced down at the tall, fat shadow bobbing gently before her. It towered above the bed, reaching just past the base of her horn and filling most of her vision. As she watched, a large drop of clear-looking liquid, illuminated by the moonlight seeping in past her curtains, beaded at the tip before dripping down the side.

Twilight bit her lip. This was not good. Ever since she’d become a princess, she’d had to deal with an increased...well, everything. A larger pool of magic had been a welcome gift, not that she’d needed it. The day her curves and bust had finally started to round out had been worth celebrating. But then she’d started to grow...and grow. Neither Celestia nor Luna had seen fit to inform of this...side effect. She’d always just assumed that their nine-foot bodies were just part and parcel of being a literal goddess...but alicornhood, she’d found out, came with more than just a title and a fancy crown.

Twilight’s bed creaked again, and she involuntarily twitched in her seated position. Her thick thighs, which didn’t part until more than halfway down to her knees, rubbed against one another, stimulating both her tired muscles and her fat, heavy nutsack. She whimpered slightly as the monumental pillar of meat throbbed before her, its easily eight-foot length lurching gently. Her newest “addition” was something she was still getting used to, but this newest growth spurt didn’t seem to be helping matters. After being a mare for most of her life…

Well. She still had her marehood, really; it was concealed just behind her new stallionhood. It was currently aching with need, though even that was nothing compared to the pressure and heat mounting in her new shaft. She could almost feel her beachball-sized nuts churning in her lap. Her scent—well, more of a musk, really—filled her lungs, and she exhaled slowly.

Right. So. Her bed was about to break beneath her weight. Order of business one: Get out of bed. That, it turned out, was easier said than done. Twilight managed to get her blanket off without too much difficulty; by now, it was little more than a medium-sized hand towel to her. Getting onto the floor proved to be the tricky bit.

She couldn’t stand up; her head was close enough to the ceiling as it was. And with a member that big, she had to be very careful of where she turned it. Slowly, carefully, she turned so that one of her palms was resting on the carpet beside her bed. She tested her weight on it, making sure that the floor and bed didn’t creak too loudly, then turned until side of her bust was smushed into her upper arm. She stifled a moan as her sensitive flesh throbbed at the contact, then set about setting her other hand onto the ground.

It was all going well—until her stallionhood got caught between her thigh and wrist. She went spilling off the side of her bed and collapsed onto the floor. The entire house trembled beneath her massive weight.

Twilight let out a soft cry as her boner, pressed against the carpet by the weight of her stomach and bust, lurched against the floor. Biting her lip, she slowly drew herself up until she was sitting back on her knees. Her rump, rounded out nicely by her ascension, squished out on top of her thunder thighs, letting a healthy fistful of assflesh sag over her well-defined quads.

Steadying herself on her shins and holding her hands to her chest, Twilight closed her eyes and tried to will herself small again. She focused on the memory of smallness—or at least, as small as a seven-foot alicorn princess could be without additional problems of gigantism—and held onto it, embracing it with her magic. The power flared up inside of her, and then subsided into a dull hum.

She opened her eyes and found—nothing. No change. She glanced down—or up, rather—at her thick, flared head and took a deep breath. It was throbbing heavily. Sweat was beading on her forehead, and she had to restrain herself from taking it in both hands and rubbing it, stroking it lovingly until, with a roar of pleasure and size, she finally came—

A tinge of red on her cheeks, she chanced a look down at the part of the carpet she’d been rubbing against after she fell. A thick white stain about as wide across as a dinner plate stared back at her. She could feel her fat nuts weighing heavily against the insides of her thighs, already eager to spill more of their seed.

The burning feeling in her chest was almost unbearable. Her heart was beating at a hundred beats a minute; her every breath came shorter and harder than the last. She felt her chest heaving slightly, her pupils dilating as her mind clouded over. The fire in her loins was incredible. She raised a hand, trembling, reaching out to her needy erection as her wings stiffened behind her. Sparks flickered at the point of her horn. She whined softly. She needed this. She needed—

The logical side of her mind took over again, shoving her lust down hard. She needed to get a grip on herself.  Twilight grimaced and eyed the stain on the carpet. With an output that large, there was no way she could risk an orgasm in here. She’d managed to clog the toilet at her new “regular” size just last week; somehow, she felt, letting her stallionhood have its way in her room would have a very messy result.

So, somewhat mournfully, she instead turned to her door. Outside, at least, she’d have a chance to relieve herself somewhat decently before thinking about how to get to a more manageable size. Most of her clothes had shredded off of her during her sleeping growth spurt—which wasn’t surprising, seeing as she’d been waiting on an order from Rarity and most of her old clothes hadn’t really fit her to begin with—and all that was left was a pair of panties. They had been stretched into a tiny, impossibly thin thong around her prized cock and balls. She could actually feel the string digging deep into the space of her asscheeks, then let out a tight gasp as she shifted her weight and felt it rubbing against her clit.

She paused for a moment, listening to make sure she couldn’t hear Spike moving about. The little drake had a fortunate tendency to sleep through most anything, which Twilight was suddenly very thankful for. Once she was sure that she wasn’t about to be disturbed, she unlocked her bedroom door with a flicker of magic, magically switched the light on, and set about trying to squeeze herself through.

Hands and knees, it seemed, were the only way she’d possibly fit. At seven feet in height, her princess-sized form already had to duck to fit through most doorways. She estimated that she was at least twice that now, and with a throbbing erection taller than the door was long, there was absolutely no way she’d manage to get through the normal way.

She held her wings tight to her back and tried to push her way through. Her head managed to fit through easily enough, though her shoulders proved a bit of trouble. She grunted, feeling her well-defined arms rubbing the wood molding raw as she pushed off with her feet. Her shoulders made it through. Next came her breasts.

Twilight gritted her teeth. Okay. She could do this. She did her best to ignore the heavy weights on her chest and tried instead to focus on the parts of her bust that were already outside of her room. Admittedly, those parts comprised only a few handfuls of titflesh that had managed to squeeze through between the doorframe and the sides of her chest, but it was a start.

Holding her breath, she sucked in her chest and stomach and tried to tease herself through, one breast at a time. She had to lean her weight on her right knee and heft her left breast with the same hand to push it through the doorframe. It took a bit of effort, but she managed to get it through. Once she’d let go, it flopped back against the outside of the frame, her underboob resting on the cool paint of the wall.

Her other breast was easier to get out, now that she didn’t have to deal with both mashing into each other. Twilight was happy enough to crawl a few more feet through into the hall. Once she got halfway through, though, her real problem presented itself: her ass.

Not just her ass, to be fair. Her hips, her thighs, her big perky butt cheeks: every pound of flesh on her newfound curves found itself wedged tightly against the doorframe. Twilight grit her teeth and tried to tug her oversized rear through the door. About five feet across, and packed equally with fat and muscle, her princess-sized tush didn’t seem like it wanted to go anywhere.

She stopped for a moment, panting. She could do this. Princess Twilight Sparkle wasn’t about to let a silly old door get in her way. Still, she reflected, stifling a grin, it was all rather silly.

Mournfully, she glanced back over her shoulder at her stuck behind. Her tapered waist curved out to a pair of foalbearing hips that could probably cover her entire couch. From there, her lower body rounded out into a pair of butt cheeks so big that only two-thirds of each were visible through the door, their tops slightly squished beneath the frame. She wiggled her butt a bit, and bit her lip when her cheeks jiggled happily in response. The sensation of her mass rubbing up against and teasing her hidden clit was almost too much to bear when her shaft was already throbbing.

She took a deep breath, tried to suck it in—however one would go about sucking in a too-fat ass, she wasn’t quite sure—and put all of her weight on her knees before heaving it forward.

The good news: she made it out. The bad news: the weight and surface area of her ass and hips crashed through the doorframe with a crash reminiscent of a falling tree. Twilight landed right on her belly, her breasts serving as a comfortable cushion beneath her chin. Her shaft, once again caught between her bust and the carpet, gave a mighty throb. She stifled a cry of pleasure as a glob of precum the size of her head burst from its tip and splattered against the banister.

She didn’t have to look back at her door to know that she’d shattered it. She could still feel her globular ass wobbling from the force of the impact. Trying to get back onto her feet—or, at the very least, her knees—Twilight once more stifled a moan as her thick thighs rubbed against a patch of skin from her nutsack they’d pinched between them during her fall. Her stallionhood throbbed appreciatively, and she could almost swear that her fat, musky balls felt even heavier against her lap as she pulled herself back up to sit on the backs of her legs.

She warily eyed Spike’s door. Once she was sure that he hadn’t heard the commotion—for goodness’ sake, how did he do it?—she settled her hands on the floor, did her best to reorient herself so that she was sitting on her rump, and pulled herself across the floor to the stairs. The carpet crumpled and folded beneath her magnificent rear, which was so wide as to take up a majority of the hallway. She did her best to ignore the feeling that her hips were rubbing against the walls around her.

She took the staircase very carefully. With feet nearly twice as long as a single stair was wide, she had to be extremely delicate with her movements. She wound up in a strange sort of standing slide, gripping the banister tightly as she pulled her weight down. With every “step”, she was able to pull herself a little more to her feet. The bannister groaned, the stairs creaking beneath her, but she found little trouble.

Until, at least, she reached the halfway point. She’d just pulled herself to her full height, the tufts of her ears barely brushing the ceiling of the main room of the library, when the stairs gave a mighty groooooaaan beneath her—and shattered.

This time, she was powerless to stop the yelp of surprise—though, surprisingly, not of pain—as she went crashing down to the floor below. This time, the whole house really did shake, and she was left groaning, rubbing her sore, jiggling bottom in the middle of a mess of debris.

“Darn it,” she groaned, eyeing the mess. This was not going to be fun to clean up. Then her erection throbbed again, and she winced. She had other things to take care of.

A flicker of her horn sent the majority of the wreckage into a tidy pile in the corner. That taken care of, Twilight heaved herself back onto her hands and knees and slowly crawled to the front door. Her monstrous shaft led the way, bouncing below her and poking out in front of her, bobbing with every “step” she made. A steady line of precum trailed between her legs, her lusty member drooling eagerly as she got closer and closer to taking care of it.

Her mind clouded over with lust, Twilight was fortunate that the library’s double doors were both much taller and much wider than her own, making squeezing herself outside a much easier—and less destructive—task.

It was a quiet night. Twilight blinked up at the starry night sky, then shivered as a warm breeze brushed across her erection. She could stargaze later. Right now, there was an eight-foot pole of stallion meat awaiting her attention.

She lumbered over to the big tree behind her house. Her breasts slapped against the top of her belly with each step. Twilight bit her lip as she felt her heavy ballsack swaying between her legs, its backside resting comfortably against her chunky thighs. She could almost feel her seed swelling, churning in their musky depths. Already, a steady stream of pre had begun to leak again from her tip.

She did her best to tip-toe into the shadow of the backyard tree, privately grateful that nopony would be awake to see this. It gave her a bit of an odd turn to see her bedroom window, lit up bright and yellow against the shadows of the night, merely five or six feet above her head. Then she ducked under a branch and leaned her weight against the trunk.

It creaked under her weight; it was an old tree, but probably only a few feet wider than she was. Twilight’s chest heaved as she gently stroked her member. The weight of her palm on her shaft sent a jolt up her spine, and she shuddered as a bolt of pleasure lanced through her.

She kept stroking, pumping her member with a pair of hands that didn’t even reach all the way around. Now almost painfully swollen and erect, the shaft towered above her, and she was easily able to press it into her soft, pillowy bust.

Twilight stifled a moan, her shaft throbbing in her grip. Then, just as the pressure built to a peak, she felt herself go over the edge. She let out a muffled cry, then forced her shaft down as a glob of cum the size of her head burst from the tip.

She let out a full dozen spurts, her chest heaving as more and more of her white-hot spooge spattered against the grass. Her balls lurched against her thighs, her mind awash in pleasure as she pumped her full load onto the lawn.

Twilight groaned as she finished herself off, her orgasm winding down to a close with a final spurt of cum. Suddenly, she felt herself shrinking back down, her body compacting with each shuddering lurch of her softening erection.

Once she was back to a “mere” seven feet, she eyed the mess she’d left. A small lake of jizz, easily six or seven feet across, had soaked the soil and grass. She could feel its warmth from here, could smell her own musk once more filling her lungs—

She crushed that thought and turned back to the house, simply happy that she was back to her normal size. She hadn’t been sure that would work, but was grateful to see that it had. Now that her body—but especially her member and rear—was back down to a more manageable size, she had little difficulty fitting back in through her front door. She flew, rather clumsily, up over the wreckage of the staircase, and resolved to fix it in the morning.

She collapsed into her bed, her limp stallionhood still leaking the remnants of her oversized orgasm onto the sheets. Her eyes fluttering closed. Her big body rubbing drowsily against her sheets, Twilight Sparkle slowly fell back to sleep.

Chapter Two

Twilight awoke to the chirping of birds. She stirred in her bed, her eyes slowly peeking open. The covers were warm and heavy over her body, and she nuzzled her head a bit further into her pillow. Aside from the sounds from her window, the room was quiet.

She wiggled her toes, still half-asleep. She giggled quietly when she found that, thankfully, they weren’t resting on the floor. Due to her new “regular” size, they did stick out a few inches over the side of the bed, but that was something she could live with. She shifted her weight, testing her mattress, and smiled when her bed creaked only a little bit more than usual.

She slowly sat up, squinting against the sunlight streaming through her curtains. She raised her arms and yawned, squeezing her eyes shut. Her fists didn’t brush against the ceiling: another plus. When she opened her eyes, she saw two perky spheres staring up at her.

Her chest felt much lighter now that her breasts only came down to the top of her abdominal muscles, and didn’t rest in her lap. She gave one of them a little squeeze, then fondled the other lightly. She giggled as it trembled in her grip, her soft titflesh warm and supple beneath her palm.

“Mm,” she murmured, smiling drowsily. She fondled both, then gave her nipples a little pinch. That woke her up a bit, but also had the side effect of waking something else up. Twilight let out a little moan as a heat grew in her loins, her stallionhood stirring.

Then she stopped and glanced down. Her member was already hardening; evidently, she’d turned herself on with all that self-molestation. Warily, she watched it bobbing gently to its full size of just under three feet in length. It nested comfortably between her cleavage, lazily drooling a stream of pre down the side of its flared head. Once Twilight was sure that she wasn’t about to start outgrowing her room again, she laid a hand on the side. She shivered.

It was a warm, pulsing thing, almost alive beneath her palm. She softly caressed the head, her fingers squeezing the area around her slit as another glob of pre oozed forth. Figuring that her arousal thus far seemed harmless enough. she smiled and slipped out of bed. Once she’d gotten into her plus-size slippers and bathrobe, she shuffled off to the bathroom, her erection bobbing happily between her legs.

She could feel the cum sloshing in her nuts. It wasn’t nearly as bad as it’d been the last night, but the warmth at the base of her shaft made her arousal a pleasant experience overall, rather than an annoyance. As she positioned herself over the toilet, stroking herself and cooing softly, she let her mind drift into the pleasant daydreams of morning.

Spike would be up soon. By the look of the sun through the window, he might already be. Her stomach rumbled at the thought of some homemade pancakes. Her new size brought with it a sizeable appetite, and Spike’s cooking was always to die for.

She gave a little grunt as she spread her fingers across the top of her shaft, her other hand’s fingers fondling and caressing her fat, heavy sack. She whimpered a little bit as another drop of pre oozed from her tool, drooping into the bowl below.

A frown creased her face as she moved to jerking herself off with both hands. Something lurked in the back of her mind. Something she’d forgotten, perhaps? She hummed to herself, relaxing her mind as she searched for an answer.

She’d just begun to feel a mounting pressure at the base of her shaft when a name crossed her mind: Applejack. Why was she thinking about Applejack?

Because Applejack was supposed to bring the cider. She had a brief image of Applejack’s wide, applebucking hips and breathed a little harder, rubbing her throbbing member a little bit more quickly. Then she pushed that aside and turned back to her thoughts.

What was Applejack going to bring the cider for? The lunch.

What lunch?

The picnic. The party—

Twilight’s eyes widened as the memory rushed into the forefront of her mind. Then she grunted, stifling a moan as her hips jerked wildly. Her cock seized up, lurching as rope after rope of her hot, thick load erupted into her toilet bowl, great globs of creamy white dripping down the sides as her balls sloshed and her shaft throbbed.

Then she groaned, feeling a little bit dizzy, both from the aftermath of the orgasm and the memory she’d recollected. Her friends—the party—

How could she have forgotten?

She all but rushed back into her room before remembering that she hadn’t showered yet and probably still smelled of spooge, and so rushed back into the bathroom.

Fitting into the shower had become less of a problem after Celestia had generously paid for the installation of a new model—Twilight was still somewhat wary of full access to a royal stipend, but couldn’t deny that actually being able to fit her curvy, busty body into a shower was preferable to looking down at the showerhead. Once she’d dried off with an oversized, fluffy towel, she set about getting herself dressed.

There was little time, sadly, to enjoy herself. Her friends could be here any minute. Twilight struggled briefly with a pair of pants, grunting as she heaved them over her ample hips. Even when she wasn’t fifteen feet tall, fitting into her clothes wasn’t the easiest thing. Most had been designed for a mare a full foot shorter and a heck of a lot less curvy than she’d become, but until Rarity finished with her order of custom plus-size clothing, they were the best she had.

At least the pants fit, Twilight thought, even if they were an oversized pair of sweatpants that she’d had to borrow from Big Mac. Even he had to look up to her these days, even if by six inches rather than most everyone else’s foot to foot-and-a-half. She let the waistband slap around her waist and then busied herself with adjusting the bulge at her crotch. It stuck out a good four or five inches, her flaccid tip and ballsack clearly visible through the tight fabric. She blushed when she realized that there wasn’t really any way to make it any less obscene; she’d just have to make sure not to get a boner today. At all.

Easier said than done. She just hoped she could get through the day without ruining or bursting out of another pair of clothes.

Her shirt proved a struggle to fit over her ample I-cup breasts. Twilight gave up trying to pull it down any further when she managed to get it down to the top of her abdominal muscles; it (mostly) covered her nipples, and while she might look a bit ridiculous with her belly showing, it was better than going topless.

Her whole body stiffened when she heard a knock on the door from downstairs. “Coming!” she sang out, rushing out of her room.

She nearly tripped down the stairs and had to fly down, which worked well enough considering that the lower quarter of the staircase was still broken. She winced going past it, and swiftly moved to the door.

It swung open easily, and she ducked down to see a familiar face grinning back up at her. “Rainbow!”

“Hey, Twilight!” Rainbow Dash stuck her hands in her pockets and strolled in; Twilight had to press her side against the wall to make sure that her breasts didn’t brush across the side of the smaller mare’s head. “Anypony else here yet?”

“Afraid not,” Twilight confessed. “I actually just got dressed myself.”

“Dressed? Sure.” Dash sounded skeptical. As Twilight flushed, Dash closed her eyes and chuckled. “I’m just messin’ with you, Twi. Though you gotta admit those clothes aren’t the best fit.”

“I...well, yes,” Twilight admitted. She shifted her weight to her left foot and glanced over the right side of her body. She was flustered to see her right butt cheek hefting above her left, its big, round shape straining against her tight pants and stretching out. Meanwhile, her left butt cheek had folded over the top of her thigh. She could almost hear her pants groaning as her considerable curves pushed them to their limits. “It’s just taking Rarity a little while to come out with clothes for my...um.” She grinned awkwardly. “...new size.”

Dash let out a shrill wolf whistle. “New size. Mm.”

“Dash!” Twilight said. “I didn’t mean it like that.”

Rainbow winked and strolled past her. “Just kidding, Twi. Gosh; why do you have to take everything so seriously? Just because you’re not wearing a bra doesn’t mean that we’ve gotta make stuff awkward.”

“But I am wearing a bra,” Twilight mumbled, eyeing the big mounds her nipples made in her shirt rather mournfully. Admittedly, it was a rather inadequate bra; it lended some support, but oodles of titflesh still wound up oozing out the sides, inflating the front of her shirt even further.

“You do look good, though,” Dash said thoughtfully. “Like, seriously. I haven’t gotten a chance to see you since after your coronation or whatever, but I gotta say, you’ll knock ‘em stallions dead.”

Twilight shifted uncomfortably as she felt Dash’s gaze drifting over her. “Th-thanks,” she stuttered, at once feeling both very flattered and very awkward. She felt something stirring at her crotch and mentally swore. Oh crap oh crap oh crap—

Spike came to her rescue. “Yo, Twilight!” he called from the kitchen. “These pancakes are getting cold. And is Rainbow Dash with you?”

“Hell yeah, it is!” Dash twitched toward the kitchen. “Got any of those pancakes ready for me?”

“You know it!”

Twilight just sighed in relief and let Dash lead her into the kitchen. It would be okay. She’d be able to control herself.

Somehow.

Thankfully, the prospect of fixing up a broken staircase was a lot more manageable on a full stomach than an empty one. Rainbow Dash looked on in vague amusement as Twilight pieced it back together, slumped against the wall and eyeing Twilight’s backside. Or at least, that’s what Twilight imagined she was doing. As she sealed the last stair in place with a flash of magic, Twilight was suddenly very conscious of how much her hips stuck out from her waist, and how big and round her rump actually was.

Trying to shift into a more subtle posture only had the effect of setting her fat ass jiggling like jello; blushing, she hastily turned back to Rainbow, only to be further mortified when her little swirl set her “girls” bouncing against her chest.

Twilight nearly gulped at the mesmerized look in Rainbow’s eyes. “When were the others supposed to get here?” she asked, clearing her throat.

“Oh! Right.” Rainbow Dash glanced at the clock above the kitchen door and smirked. “Actually, right about—”

There came a knock on the door.

“—now.”

“Surprise!” Pinkie Pie cheered when Twilight opened the door. Twilight had to peer down a bit, scrutinizing the smaller mare’s form as she tried to figure out what, exactly, the surprise was. “We brought cupcakes!”

“That ain’t exactly a surprise, Pinkie.” Applejack, who was standing just behind her, rolled her eyes. “You always bring cupcakes to these things.”

“Oh, but this time is different! I brought marzipan cupcakes, and chocolate chip, and marzipan chocolate chip, and—”

“Good to see you, Twi,” Applejack said, smirking helplessly and pushing her way past Pinkie. “You’re lookin’ well.”

“Thanks,” Twilight said. “Why don’t you girls come sit down in the kitchen?”

As Applejack and Pinkie Pie happily made their way inside, Twilight found herself staring after them. How could she never have noticed just how muscled Applejack was? So toned, so strong, with smooth, thick biceps and a pair of legs that could probably split a log in two—

She tried to clear her thoughts, but by then she’d noticed Pinkie too. Pinkie! Gosh, but it was easy to see where all those sweets went, now that she had a rear view. Pinkie’s trunk was even fatter and fuller than Twilight’s. All soft and plushy, she imagined, warm like fresh cookies, melting and molding around anything that touched it—

What was wrong with her? Ogling her friends like a couple pieces of meat. Twilight blushed. Not that she’d ever thought about anypony that way before. What was going on here?

She felt a stirring at her crotch and forced her gaze away from Pinkie’s bouncing cheeks and thighs. Gosh, but she wanted to squish that soft rump beneath her hands, to sandwich those cheeks gently around her hard, throbbing—

Stop!

Shaking her head and blushing even harder, Twilight followed the others into the kitchen. She thought she caught Dash giving her an odd, sort of thoughtful look as she entered, but wrote it off as imagination.

Rarity arrived about five minutes later, with Fluttershy following up and spending a good minute apologizing for her lateness. As she welcomed them inside, Twilight resisted the urge to ogle—Rarity’s slender, curvaceous form; Fluttershy’s full, round chest—and did her best to think about books instead. It mostly, but not entirely, did absolutely nothing to help.

Other than an occasional wandering eye, Twilight found that the morning from there proceeded splendidly. Everypony (but Dash, at least, who proclaimed loudly that she’d brought her appetite) had brought something for their picnic. Fluttershy had a rather nice-looking cheese-and-nuts array, Rarity had a platter of orange slices, and Applejack had brought…

Well. Nopony had ever said that the Apple family wasn’t consistent.

They chatted merrily as they assembled the sandwiches, Spike retiring to his room to read comic books when Fluttershy accidentally mentioned a stallion she’d seen in town who was “kind of cute.” As they packaged up the sandwiches and marched out to the backyard, Twilight struggled to keep her thoughts off of whether she was cute as well.

There was no doubt, at least, that she didn’t fit into a normal mold of “cute.” Applejack had always been the tallest of her friends, but now even at her “smaller” size, Twilight towered over her by a good ten or so inches. Everything about Twilight screamed big: big breasts, wide hips, and a butt so big it wobbled whenever she walked.

Not like Rarity. With those slender curves, that dainty cream-white coat, Rarity was everything a mare should be. Twilight felt a shiver go up her spine every time she heard her laugh, and had to resist the urge to eye her tight, round bottom every time she got up to fetch another orange slice.

Keeping her eyes to herself, though, didn’t come easy. Like it or not, Twilight was suddenly forced to see just how...well, attractive each of her friends were. As much as she tried to resist, a burgeoning arousal spread through her veins with each passing minute, her stallionhood chubbing up a bit more every time Pinkie slapped her rump alongside the punchline of some joke.

By the time they headed back inside, Twilight’s member was nearing full mast. She’d managed to direct it down one of her pant legs, which it had currently stretched to around twice its usual width, but it was better than the alternative of pushing up through her shirt. She’d never been more aware of her full, sloshing balls, so full of seed and musk.

As her friends spread themselves out in the sitting room, still chattering happily, Twilight struggled with her growing arousal. She’d just gotten off that morning, for goodness’ sake! It didn’t help that Pinkie’s rump bounced every step of the way back inside, or that the sweat beading on Rainbow’s arm so wonderfully highlighted the slim, lean muscles working beneath her skin. Twilight eyed them both as her erection throbbed, then mentally slapped herself.

This wasn’t working. She had to focus on something else.

Once everything had been cleaned up, they settled into the living room. She sat on the loveseat, her buns too wide to fit comfortably in the other chairs in the room. Fluttershy had curled up between Rarity and Pinkie on the couch, and Applejack had taken Twilight’s old rocking chair. Dash was splayed on the floor, her back against the side of the coffee table.

They were talking about something—some upcoming show in Manehatten, she thought. She did her best to tune in, but the throbbing erection running down her leg proved difficult to ignore. It pushed obscenely against the fabric of her pant leg; if any of her friends had looked at her now, she doubted that they could have missed it.

So she shifted her weight, trying to angle the inside of her crotch away from the rest of the room. The movement caught Applejack’s eye, who paused and turned to look at her.

“Hey, Twi,” she said, frowning. “You’ve been quiet all day. Y’alright?”

“Just fine,” Twilight said. She tried to force a smile. Her motion had done little but push her shaft another inch or so down her thigh, teasing her flared head against the inside of her knee. “Really,” she said, gritting her teeth, “I just like to listen to you girls talk.”

She tried to cross her legs to hide her erection and choked on the last word. Her ample thigh flesh had squished up against the side of her shaft even as it pressed down on her sizeable balls. She winced as the weight of her leg depressed her melon-sized nuts, then stifled a moan as a sudden jerk of her hips set her spooge sloshing in their fleshy prisons.

“If you say so.” Applejack didn’t look convinced.

“C’mon, Twilight!” Pinkie leaned forward in her seat. She’d hugged her arms around her chest, her forearms pushing the underside of her bust up and out. “You’ve been way too quiet! And I should know! I’m, like, an expert on quiet!”

Dash burst out laughing. “Sure, y’are, Pink. Sure, you are.”

Twilight noted Dash smirking at her and hurriedly glanced away. She was suddenly very aware of the weight of her own breasts against her chest, and of the tightness of her shirt around them.

Had it been that tight a minute ago?

“I’m fine,” she said, doing her best not to look at Pinkie. She chuckled nervously. “Sometimes a pony is happy just to be...”

Unwillingly, she glanced back in the direction of the couch. Pinkie had leaned over her lap, her upper arms squeezing her jugs until a good half-inch of titflesh had oozed out over the sides of her shirt. The back of her shirt had ridden up a bit over her hips even as her pants had slid down, giving Twilight an eyeful of the pink mare’s big, supple thigh.

A half moan slipped from Twilight’s mouth. She felt her clothing tighten around her, her erection throbbing harder as warmth spread throughout her body. The loveseat creaked, and when she opened her eyes a second later, the room looked...smaller, somehow—as though she were looking down from a greater height.

Oh, no. A chill went down her spine. This couldn’t be happening. Not here, not in front of everyone.

“To be what, darling?” When Twilight didn’t reply, Rarity continued. “It’s quite alright if you’re unwell,” she said, as if Twilight hadn’t just swelled an inch in front of them. Admittedly, she was already so big compared to the others that perhaps they just hadn’t noticed. “We can go.”

“No!” Twilight said, a bit too quickly. “It’s fine.”

“I know what’ll cheer you up!” Pinkie spread her arms wide and beamed. Her “fillies” bounced against her chest, suddenly freed from their prison. “A hug!”

“No!” Twilight shook her head, then froze at the odd looks at everypony was giving her. “That is,” she mumbled, shrinking into herself as best as a seven-foot mare can, “no thanks. But thank you, Pinkie.”

“Anytime!”

“I like having you girls here,” Twilight said, cracking a smile. In more ways than one, her subconscious added. Shut up, she told it. “Really. Hugs or no hugs.” She gave Pinkie what she hoped was a friendly grin.

Applejack still looked skeptical, but Rarity just nodded and sprung into a discussion of this season’s fashion events. Twilight just gritted her teeth as her tool gave another throb. She could get through this. She just had to control herself. She could manage.

And she did. Mostly.

By the end of the afternoon, she’d “only” grown up a few more inches. What was seven and a half feet when you’d started most of the way already there? Sure, maybe her butt had started to fill up most of the loveseat, and sure, maybe her pants had started to rip a bit down the seams. Sure, maybe her heavier tits had pushed her shirt down until a good six inches of cleavage showed, and sure, maybe the loveseat had started to groan threateningly every time she shifted her weight. But she was still in control, really. Mostly.

Okay, and her member had maybe grown a little bit too—if, by “little” bit, one meant “literally poking down past her knee.” Twilight had stifled a moan the first time her cockslit had rubbed against the fabric of her jeans. That’d happened more than once, and had only intensified as she filled out her undersized clothes. Her balls felt hot and heavy; she’d once made the mistake of placing her hands in her lap, which let them sink a good quarter-inch or so into her plump, sloshing nuts before she’d jerked them back up in panic.

Her arousal just hadn’t stopped, intensifying with every half-motion or glance she gave the others. Dammit, Applejack wasn’t that sexy! But her growing erection certainly thought she was. Every single little thing, every word or look, did nothing but contribute to her growing lust, her balls feeling fuller and her shaft feeling harder by the second.

By the time her friends had started to head out, Twilight was actually panting with the exertion of keeping her arousal down. Her cock was shuddering, a steady stream of pre moistening the bottom of her pant leg. She twitched as Rarity and Fluttershy, the last two to leave, turned to wave goodbye—

—and then, as the door slammed shut, let go.

She exploded with size, filling up most of the room in the blink of an eye. Her head nearly brushing against the ceiling, and her hands struggling to contain her alicorn-sized shaft, Twilight cried out, the spooge in her nuts bubbling up, swelling with pressure until she could contain it no more.

She came more than buckets—she came barrels. Dozens of gallons of her spooge erupted from her flaring tip, splattering every inch of the walls in a wave of jizz. Twilight’s hips bucked again and again, her oversized form actually adding on another foot or two in height as her overfilled balls seemed to evacuate every drop of seed from their bottomless, aching depths.

By the time she came out of it, her chest was heaving, her limbs shaking. Twilight panted as she slowly shrank down. She eyed the drenched, white-covered walls mournfully.

This wasn’t acceptable. This had to stop.

It took her three hours to clean up her mess. When she finished, she measured herself on a whim and found that she was now seven-foot-two, rather than a clean seven feet.

She definitely needed to get a handle on this. But how? After thinking it over, Twilight realized that there was only one pony who might be able to help her.

Extremely conscious of her new size, she carefully made her way upstairs. She had a letter to write.

Chapter Three

Dear Princess Celestia,

I hope you’re doing well. Things are mostly fine in Ponyville. I’m actually writing to you about a personal problem.

I’m afraid that I was rather unprepared for the physical changes that seem to have accompanied my coronation. The size, for example, has become fairly unwieldy. It makes me a bit uncomfortable to write this out, too, so I’ll just say that I’m not entirely sure how to deal with my new “equipment” either. It seems that all I can do these days is think about...well, sex. Sex and size.

I’m sure some other ponies would love that. But I just want some way to operate normally. I need to find some way to control myself, but right now, I’m at a loss. I would appreciate any advice or help you might be able to give me.

Sincerely,

Twilight Sparkle

“At least she’s stopped signing ‘Your Faithful Student,’” Celestia murmured. Then she moaned, softly, as something squeezed her chest.

Luna smiled innocently. A good six inches shorter than her sister, her “smaller” size put her about even with Celestia’s shoulder. She continued fondling Celestia’s bust, her arms stuck through Celestia’s and her own ample bust pressed tight to her sister’s back. Celestia opened her eyes and gave her sibling a knowing look.

“A letter from Twilight?” Luna asked. She kept massaging Celestia’s breasts. Once, when they were much younger, she’d been able to hold one in each hand. No more. Now, they overflowed her grasp, her palms pushing deep into their doughy width as her fingers worked Celestia’s titflesh. Luna swayed her hips gently, prodding her crotch against Celestia’s rear.

“Honestly, Luna.” Celestia smirked at her sister through the mirror. “Even foals can keep their hands to themselves.”

“But I haven’t properly said ‘good morning’ to you, yet.” Luna pouted, then smirked. Her right hand trailed down Celestia’s waist, then curved around her hips. Celestia’s butt cheeks squished and bounced against Luna’s crotch as Luna gave her generous flesh a squeeze. She let her hand drift a bit lower, lower still, until it was just barely brushing against—

“Later,” Celestia said. She frowned, glancing down at the letter hovering before her. “It would seem that poor Twilight isn’t growing easily into her new status.”

“Oh?” Luna asked. “How so?”

“Lack of control. It likely means that she’s holding herself back.”

“Back? She’s only a foot and a half shorter than me.”

“As you are now, Luna. But unrestrained—”

Luna thought about that. “Ah,” she said. She gave Celestia’s hips another squeeze.

“One does not grow into alicornhood easily,” Celestia murmured. She inhaled sharply as Luna’s wandering fingers found their way back to her crotch. “Goodness knows I have enough difficulties fitting into houses beyond the Palace. Twilight is suddenly dealing with a world much smaller than the one she grew up in.”

“Perhaps we can help her,” Luna said. “Provide some...persuasion.”

Celestia felt a warmth on her neck. She turned, took Luna’s lips in her own. She suckled hungrily on her sister’s lips, tasted her on her tongue.

When she pulled away, she was vaguely amused to realize that she was meeting Luna in the eyes. Usually eight-foot-six, it was rare that the younger Luna was of a height with her bigger, nine-foot-tall sister.

“Growing already, Lulu?” Celestia said. She turned back to the mirror and gently stroked her crotch. A thick, growing bulge lingered there. She shivered as her forearm brushed against one of her thimble-sized nipples, then stifled a moan as the bulge lurched. It was growing stiffer by the second.

“It would appear I’m not the only one.” Celestia did moan when Luna lightly nipped her on the shoulder, her wandering hands stroking Celestia’s growing erection. “Come, sister. We’ve done nothing since yesterday.

“Perhaps,” she added, a twinkle in her eye, “it might provide you with some inspiration as to how to help Twilight.”

With a sigh, Celestia smiled helplessly and turned to her sister. “But these were my favorite pajamas,” she murmured, once Luna had brushed her lips against hers once more.

“Were,” Luna said. “More can be made. And to be fair,” she said, smirking down at her sister from a height now four inches greater, “you’ve always liked outgrowing your clothes the most.”

Celestia sighed again, then grinned. “You know me too well,” she said. She placed her hands on Luna’s hips, her oversized bulge rubbing gently against Luna’s own, reached up for a third kiss—

—and let go.

Twilight was grumpy.

She’d woken up that morning to a case of morning wood and a nearly painfully full pair of nuts. Out of pure spite, or perhaps an unwillingness to allow her new size to dominate her, she’d refused to jerk off. She’d refused to empty her balls, and now, she was halfway to regretting it.

Before her ascension, she’d tried to make it a habit of going to the gym once a week, ostensibly to remove the little tire around her gut. She’d gotten it, she’d suspected, from eating one too many donuts on a studying fix. These days, she no longer needed it, but couldn’t see the harm in keeping up what was, undoubtedly, a good habit.

Twilight was just grateful to reach the gym with her clothes in one piece, and mostly unstained. She’d decided enough was enough and had wound up hitting the Big and Tall store in town. She’d left with a pair of workout pants meant for a pony a foot shorter than her, but with hips a good twelve inches wider. Good enough.

She’d attracted no shortage of attention on her way there. It turned out that when you were head and shoulders above everypony else, ponies tended to stare. By the time Twilight passed through the gym’s double doors, she was sick of double-takes, and sicker still of the triple-takes ponies made when they saw her bulge flapping obscenely against her thighs.

Thankfully, she was only an inch taller than when she’d gone to sleep the previous night. She almost laughed at the thought. “Only.” Seven-foot-four wasn’t a whole lot bigger than seven-foot-three. But given that she’d been an even seven-foot for a whole week before that, it seemed reasonable cause for concern.

At least she hadn’t had to duck to get through the gym’s doors. And at least she’d been able to fit through her bedroom door that morning (though she’d spent a good hour the previous day fixing up the damage she’d done to it two nights ago). Still, she wished she could see somepony who’d be able to see, at the very least, over her nipples.

She sighed as she made her way over to the free weights. She might be able to fit into one of the machines, but she didn’t want to test her luck. Still, she told herself, at least a good, hard workout might be what she needed to get her mind off things.

Twilight took up her position by a pair of wall-set mirrors. She’d grabbed a pair of weights from the rack, not really caring which ones. Most of them felt light to her anyway.

She decided she’d start with squats today. Once she’d stretched, she picked up a weight in either hand, positioned her feet around shoulder width apart, and started.

Keeping her knees out and her toes pointed, Twilight descended into her first squat. She kept her butt firm and did her best to keep her legs bending easily. Keep the weight on your feet, she told herself, not on your spine.

As she went down, she breathed in deeply. Her chest inflated impressively, her heavy breasts pulling forward and threatening to unbalance her. Frowning, Twilight rocked her weight back a bit so that she was leaning on her heels. That seemed to help, but pushed her rear even further up, leaving her big butt sticking out between her hips.

She let out a long groan as she went all the way down. She would’ve preferred to get her hips below her knees, but with all of the extra padding and muscle her thighs now had, the best she could manage was two or three inches above. Grunting and gripping her weights a little tighter, she slowly ascended into a standing position.

The next time she went down, some part of her noted something...off. Twilight glared at the bulge snaking down her pant leg, daring it to cause trouble. But, as full as her aching balls still felt, it didn’t seem like her stallionhood was interested in causing any disruptions right now. Privately thankful, Twilight began her next breath and descended again.

She nearly groaned. As her knees pushed out, she felt her thighs rubbing against one another, her supple flesh teasing against her hidden clit. Her butt ballooned out behind her; she could feel her new sweatpants clinging to her curves, suddenly feeling incredibly tight. As she went down, the bottoms of her buttcheeks folded over the tops of her thighs, her chunky assflesh compacting as she lowered herself further.

Gritting her teeth, Twilight brought herself back up. Once she’d made sure that nopony was looking, she briefly inspected her pants. They seemed fine...but they were certainly no looser than they’d been a minute ago.

Feeling slightly worried, she glanced at her reflection in the mirror. But her fears seemed unfounded; she was just about the same height she’d been when she’d started.

The next time she went down, her pants felt almost unbearably tight. She groaned under her breath, adjusting her posture as she got into a full squat. Closing her eyes, Twilight tried to clear her mind—and then moaned instead as she heard something rip.

Her eyes fluttered open. Twilight could feel her butt getting bigger, could feel her hips widening as she went even deeper into the squat. Out of the corner of her eye, she could see a small rip going down the side of her hip. It wasn’t large, but a healthy amount of purple flesh poked through.

Panicking, Twilight struggled to pull herself out of her squat, and nearly collapsed to the floor as a wave of pleasure washed over her mind. Her member throbbed against the tightness of her pants, her big rear pulling away more and more fabric as her body grew further into a pear shape. She felt it throb again and again, a mounting pressure growing at her crotch.

Letting out a muffled cry, Twilight held every muscle in her body taut. Then, slowly, once she was sure that her leg wasn’t going to explode into a flood of white, she carefully, cautiously, drew herself up out of her squat.

Though they’d been a bit tight before, her sweats now clung to her hips like a form-fitting sleeve. She rotated a few degrees and stared as her big butt wobbled. A few more rips had opened up along her rear, with even more of her supple assflesh poking out.

A red tinge colored her cheeks. “Right,” Twilight mumbled to herself. “No squats.” She inspected her pants. Upon assuring herself that she hadn’t made a mess of the mat below her—though she’d left a circular damp stain near the halfway point of her leg—she swallowed, then searched for a different exercise.

Arms! That was good. Little to no risk there. She just had to get some heavier weights. Wobbling slightly from the new weight of her rear, and very conscious of the way her thighs rubbed together as she walked, Twilight made her way back to the weight rack—only to realize what might happen to her pants if she attempted to bend over in her current state.

Then again, she decided quickly, her current weights should be fine. Taking a moment to inspect her form, she nodded and began her second workout.

It took all of thirty seconds for her to realize that each time her muscles flexed, bulging against the tension of the weights, they didn’t entirely un-flex. Instead, they kept some of their new size, getting a little bigger, a little harder, and a little stronger. By her tenth rep, it barely felt like she was holding anything at all. Worriedly, Twilight noted that her sleeves were straining to hold her arms in, and that small rips had started to emerge along the seams. She quickly dropped the weights.

So lifting was out. The chest press proved to be a bad idea, too; though her arms didn’t get any bigger, and her butt “only” squished out beneath her rump like a massive pillow, each pump of the dumbbell pushed her arms a little further away. That was when she realized that something else was pushing them up: Her breasts had been steadily swelling with each rep. In what seemed like no time at all, they were pushing against her forearms, straining mightily against her training bra. Twilight could barely see over her top. Gritting her teeth, she set the barbell in place and sat up, her now watermelon-sized breasts bouncing happily against her chest.

For goodness’ sake; was there anything she could do that didn’t make her any bigger? Twilight groaned as the bulge in her pants throbbed. Her erection had been growing stiffer throughout her entire workout. She’d been able to feel her balls filling up with seed all morning, growing fuller and fuller without any release. They ached to release their sloshing contents; she could feel them pressing against the insides of her thighs, dropping almost down to her knees by now, plump and heavy and full.

She couldn’t take care of that now. She wouldn’t allow herself to. Damn it, but she would finish a workout today! She wouldn’t let this stop her.

Grimacing, Twilight got to her feet. Just that one simple motion set her boobs and butt jiggling madly. Twilight just sighed.

After scanning the rest of the gym, her eyes settled on the treadmill. Perfect. Heavier mares than her used those to work out—though most of their size was in different places—and she couldn’t think of any particular muscle group that should be affected by a quick bit of cardio. She could probably stand to burn some fat anyway.

Twilight set herself up on a treadmill at the far end of the row. Deciding to start off easy, she kept the resistance low and set herself off at a low speed. Going with the treadmill, she started to jog.

At first, everything seemed fine. Twilight smiled to herself, then wiped away a bead of sweat from her forehead. This was great. She was getting her workout at last.

But she’d neglected to account for one thing: the friction of her newly tight pants against her crotch—or, more accurately, against her entire leg.

Every time Twilight pulled her right leg back, the same butt cheek bulged out, pulling a good amount of fabric with it. As the bottom of her cheek slid across the side of the other, her pant leg tightened around her left side. As it so happened, that was the same leg she’d “adjusted” her stiffening member into. Now, each time her leg pulled back, it pulled the pants’ fabric across her shaft, the soft material sliding comfortably across her flare and squeezing her shaft tight.

Twilight gasped lightly as the treadmill started to pick up the pace. Her faster jog pushed her into a more uncomfortable position. Her chunky thighs slid past one another around twice a second, constantly rubbing and stimulating her growing bulge.

Because it was, actually, growing. Twilight let out a strangled groan as it throbbed, then swelled until it stretched past her pant leg. Twilight was forced to keep her left leg uncomfortably straight for fear of stimulating herself further any time she bent her knee back. Unfortunately, all that did was provide an easier route for her tool to grow, inching its way down toward her shins as the pressure built in her plump, heavy balls.

The taut fabric at her crotch clung to her bulging nutsack, massaging them, teasing them with every step. Twilight stifled a moan as her cockhead flared, spurting a few ropes of precum onto her ankle. They drooled out of her pant leg, her meat steadily leaking more pre by the second than most stallions could provide in a full load.

Twilight soon found herself struggling against thoughts of lust. The poor mare was powerless, stuck between her own stubborn pride and mounting arousal, as her big body’s every movement just drove her even more crazy. Soon, the bulge in her pants resembled nothing less than a third leg, and her crotch felt ready to burst. Grunting, whimpering, Twilight frantically searched for the treadmill’s “off” button.

The instant she pressed it, she dashed off for the locker room. Her fat bulge, perfectly outlined by her tight pants, flopped from side to side as she threw herself through the door, crammed herself into a toilet stall, and slammed the door shut.

It took less than a second for her to tug her pants down over her hips, as figure-hugging as they were. Twilight Sparkle was desperate. The second she had her stallionhood free, she steadied herself against the wall, closed her eyes, and released.

She cried out, her hips jerking wildly, as she unleashed load after load of hot, thick cum into the bowl. Her legs shook, her eyes squeezed shut, and her balls smacked against her thighs as they unloaded an impossible amount of her seed. Soon, the bowl was overflowing with her jizz; soon after that, it was dripping down onto the floor, a lake of Twilight’s thick, creamy baby batter spreading out to cover the floor.

Her chest heaving, and sweat dripping down her cheeks, Twilight let out a long, shuddering sigh. She balled her hands into fists and gritted her teeth. Then, her shoulders slumping, she heaved her pants up over her softening, dripping stallionhood before awkwardly edging her way out of the stall.

She pitied the poor janitor who had to clean up her mess. But right now, all she cared about was finding a (private) shower. And from the looks of it, none of the shower stalls here would have any hope of fitting her.

So, refusing to make eye contact with anypony she passed, Twilight made her way out of the gym. She had a long walk home. She just hoped it would be an uneventful one.

It wasn’t.

Twilight all but slunk back to her home. Admittedly, her larger form (she had to be nearing seven and a half feet by now) made “sneaking” difficult, but she did her best. At the very least, she kept her eyes stapled to the ground, watching her feet make long, efficient strides as she made her way home.

All went well—for about three minutes.

“Hey, Twilight!”

Twilight recognized the voice instantly and decided to pretend to ignore it. She could already feel herself chubbing up again, and she did not want to get home a second later than she could help it.

“Twilight!” Hoofsteps behind her. Twilight walked a little more briskly, her long legs taking her about as fast as a smaller mare’s jog.

“Hey!” Twilight winced as Rainbow Dash ran up beside her before settling into a more moderate trot. “What, you going deaf or something?”

Twilight sighed and stopped. “Something like that,” she said.

“Just saw you walking and thought I’d say hi.” Dash smirked up at Twilight. She eyed the bigger mare’s clothes meaningfully. “Going to the gym, huh?”

“Leaving, actually,” Twilight said, hoping that Dash would get the hint. “I was just heading home.”

She didn’t. With standard RD tact, she happily barrelled through Twilight’s subtlety with all the care of a rampaging bull. “Oh, cool,” Dash said. “I always love going to the gym. You get a good burn going?”

Twilight thought of her struggle on the treadmill. “Something like that,” she said again.

“Awesome.” Twilight stared; had Dash just winked at her? “Not that you need it or anything.”

Swat.

Twilight swallowed her gasp. Had Rainbow just—

No. There was no way. But—

Dash pulled her hand back from Twilight’s behind and winked again. “Heck, Twi. I know some mares who’d kill for your definition. I mean—“

Twilight heard none of it. She was too busy coming to terms with the fact that Rainbow Dash had just slapped her ass. Rainbow Dash had just slapped her ass. Her ass.

Her big, wobbling, growing ass.

Oh no.

She’d stopped her squats midway through a spurt, and had let all that tension and growth taper off, simmering just under the surface. But Rainbow’s slap—dirty-minded or not—had set the growth free. Twilight bit her lip, her eyes darting behind her as she watched her rear and hips begin to balloon out. Her already skin-tight sweatpants stretched even further, becoming paper-thin. She could see her flanks wobbling prodigiously from where Rainbow had slapped her, bouncing and jiggling happily, as though they had no intention of ever stopping.

And for all she knew, they really didn’t.

“Sorry,” Twilight blurted. She heard something rip as she pushed past a confused-looking Rainbow Dash. “Gotta go. See you—“

Rip. Several threads popped around the bottom of her butt, where her heavy butt cheek met the top of her thigh.

“—sometime!” she finished, panicking and breaking into a run. She could already feel her stallionhood stirring, stiffening to its full, massive length and stretching her pants even further, up to and past their breaking point—

Her meat and potatoes slapped loudly against her thighs as she ran, the impossibly tight fabric little more than a glove around her stallionhood. She gritted her teeth, tears coming to her eyes as she struggled against her huge, oncoming load.

I have to hold this, she told herself. She could already feel her spine lengthening, her whole body readying itself for growth as her left butt cheek sheared through her pants entirely. I can make it inside. I’m going to make it—

She didn’t make it. Not thirty feet from her front doorstep, her foot caught on a pebble in the path. Twilight let out a cry and found herself flung forward onto her knees. Her pants all but exploded off of her, and she followed after, exploding in size as her member reached its full length and then kept going, growing huger and huger and heavier against her crotch—

Twilight felt her hips jerking wildly, her body heaving completely independently of her will as she went into a growth overdrive. Her cock flared up, higher and higher until it towered above her body, even as her kneeling body nearly reached her bedroom window, her whole figure convulsing with the force of her oncoming orgasm—

When she finally came to, she was lying prone on the ground, her clothes in tatters around her. Twilight groaned, shifted her weight. Her deflated member dragged on the ground, pinned between the dirt and her ankle. As she picked herself up, she noticed what she’d been aiming at: the neighbor’s house, a nice little pink cottage, had been right in the blast zone. It had been absolutely drenched in a thick, creamy white.

“Well,” she grunted, staggering toward her front door. “I hope things can’t get any worse.”

She was pleasantly surprised, then, when a blushing and slightly surprised Spike greeted her at the door. She had a letter.

A reply from Princess Celestia.

Chapter Four

“Wait a minute,” Twilight blurted out. “Um. Sorry. Could we back up a second?”

Celestia leaned back in her throne. She eyed Twilight calmly. Her ethereal mane floated gently beside her. “Of course.”

“Testing,” Twilight said. “As in, testing me? For what?”

“I thought it obvious. To see how big you can get.”

Twilight whirled. “Princess Luna!”

Luna smiled, and let the door swing shut behind her. “A fine goal, don’t you think? Especially given your new...stature.”

Twilight hadn’t expected this. She felt a stirring at her crotch and glanced down hurriedly. Why Luna was sashaying her hips, she didn’t exactly want to know. “But I thought the whole point was to get me smaller.”

“Now what might have given you that idea?” Twilight felt a weight on her shoulder and looked up. With some amount of surprise, she found that she was looking straight into Luna’s eyes. The other alicorn smirked. “I confess, I haven’t had to look up to a pony other than my sister in...millenia. I must confess, I’m rather savoring the opportunity.”

“No, no.” Twilight stepped back. “I thought—that is, I wanted the two of you to help me get control of...well…” She turned back to Celestia and waved a hand awkwardly over her body. “This!”

“And we will,” Celestia said. She stood up.

Twilight swallowed as Celestia’s dress cascaded around her, the hem swishing softly around her ankles as she made her way down the steps. The Princess’ long legs cut wide strides across the marble throne room floor.

Twilight had always known that her mentor cut a shapely figure—many ponies considered her the most beautiful mare in Equestria. Yet, aside from a healthy respect for her beauty, Twilight had never before really considered Celestia in...that way. Now, she found herself eyeing the twin mounds at Celestia’s chest with newfound interest. Her heart nearly stopped when her eyes drifted a bit lower and saw a smaller, yet no less impressive bulge, centered right at Celestia’s crotch.

Of course she had one too. How could she not have realized?

“I’ll be happy to help you, my student,” Celestia said. She swept across the floor and laid a hand on Twilight’s shoulder. Though she was now, nearly, of a height with the eight-foot-six Luna, Twilight was grateful to still be shorter than her lifelong teacher. It felt...proper. “But you must understand that there is much you do not know of your…” She gave Luna a glance. “...predicament.”

“I’ll listen,” Twilight said. “Really. Just...please, help me.”

A smile touched Celestia’s lips, and, like a foal, Twilight instantly felt that everything would be fine. “Of course,” Celestia murmured. Then she stepped away.

“The size of an alicorn,” she began, “is not strictly a biological phenomenon. Each of us has a base form, a group of certain ‘normal’ attributes. Upon ascension, though, we...grow.”

“How much depends on the source of our power,” Luna cut in. “The Moon, for me; the Sun for my sister. Princess Cadance, for example, draws power from love.”

“A more powerful energy than either of ours,” Celestia added. “She’ll be larger than us before long.”

Twilight blinked, thinking back. It was true...she did remember Cadance being smaller when she’d been her foalsitter. But she’d just written it off. “So that’s why I’m growing?” she asked. “Because I’m now the princess of…”

“Friendship,” Celestia said. “Or magic, if you like. They’re roughly synonymous.”

“Such power,” Luna said, “is equivalent to that of the Elements of Harmony themselves. Even Cadance is still six inches shorter than I. She has time to grow—as do you.”

“With such a potent source of energy,” Celestia said, offering Twilight a smile, “it’s little wonder that your size has increased so dramatically, and in such a short period of time.”

“That...makes sense,” Twilight mumbled. “But what about the...sexual stuff?” She blushed. “I shouldn’t be getting this, well, turned on at everything. And the, erm, genitalia.”

Celestia and Luna exchanged glances. “As a Princess,” Luna began, “you are now a representative of all of Equestria—thus, your body has shifted sexually to fit. I’m sure you’ve noticed that you’ve retained your marehood as well.”

Twilight nodded meekly.

“As for the libido…” Celestia shrugged. “It’s a part of our mantles that we be encouraged to be highly fertile and driven, especially during the early years of our ascension. To intermingle one’s power with the populace provides for a stronger, more united Equestria in the future.”

Twilight’s ears burned. “Wait. You mean that I’m expected to—”

“Yes,” Luna said cheerily. “As frequently and as widely as possible.”

She had not just heard that. The stiffening pressure down her leg, though, was proving otherwise. Her mind was suddenly assaulted with images: Fluttershy’s big, bouncy chest; Rarity’s smooth, lithe curves; Applejack’s muscles; Rainbow Dash’s tight rump—

She shook her head clear. “I—I don’t really want to think about that right now,” Twilight said. “If you don’t mind. I just want to get this under control.”

“Of course, Twilight,” Celestia said kindly.

“Especially my growth spurts,” Twilight said. “One minute, I’ll be my normal height—” whatever that meant anymore “—and the next I’ll be twice that. Or even bigger!”

“Ah,” Celestia said. She pursed her lips. “That is indeed another part of your magic. Watch.” Luna lightly nudged Twilight aside and walked over to join her sister. Staring, and still blushing faintly, Twilight waited for Celestia to continue.

Then, Twilight gasping in the background, Celestia took her sister in her arms and kissed her on the lips.

It wasn’t a chaste kiss, either—definitely nothing one could expect to see between siblings. No; Celestia was kissing her hard, and Luna was pushing back into it with just as much force. The two siblings’ muzzles dueled, their busts squishing outward as they forced their mouths closer and closer together. There was undoubtedly tongue involved.

Twilight’s cheeks burned as Luna moaned into her sister’s lips, her hands roaming down to Celestia’s thighs and squeezing. Oh, yes. There was definitely tongue.

Celestia was getting into it too. She was swaying back and forth, her crotch grinding gently against Luna’s. As Twilight watched, her mouth agape, two large shapes pushed up between the Princess’ cleavage—two very phallic shapes. Celestia suckled on Luna’s mouth, her fingers grasping hungrily for her sister’s fat, supple ass.

Their shafts stiffened between them, the constant jerking of both sisters’ hips frotting them against one another. Twilight’s ears felt like they were on fire, and some innocent part of her yearned to look away. But she felt powerless to keep her own hand from drifting down toward her hardening crotch.

And then, just as a particularly throaty moan slipped from Luna’s lips, they began to grow.

Celestia was the first, if only by a few seconds. One moment, she was “simply” a larger-than-life alicorn, a foot taller than her sister—and then the next, she was looking down at a mare who had to be nearly two feet shorter.

Twilight gaped as Celestia pulled her mouth away and groaned, stretching her long legs to their full length as her growth began. A tear appeared down the side of her dress, then another, and then a third; in what seemed like no time at all, the entire front of her dress had ri-i-i-iped right down the middle, exposing her burgeoning cleavage. Celestia moaned again, her hips jerking against Luna’s. The motion pushed her waist forward and her chest back, causing the top of her dress to tear even further. Her “girls,” now hanging down past the top of her torso, wobbled happily, straining against the tight fabric to a maximum.

But she wasn’t the only one growing. Luna had started too, and was fast catching up. The popping of fibers filled the air as Luna’s big, growing rump forced its way out of its cloth prison. Her pants all but exploded off of her frame as her body climbed higher and higher, her big, jiggly ass cheeks wobbling crazily. Luna was panting, her cheeks burning a bright leg as she thrust her shaft between her and her sister’s jugs again and again, a steady geyser of pre spurting from her erection. As Celestia reached thirteen feet, Luna had just passed twelve—and both sisters looked ready to more than continue growing.

Twilight bit her lip and groaned. All of the heat in her body seemed to be rushing to her crotch. Her shaft pushed mightily against her pant leg, swelling with approval at the sight of the two growing princesses. It still wasn’t sure what it was seeing, but whatever it was, it liked it.

She didn’t even come up to Luna’s shoulders anymore; the top of her head would have just barely brushed against the bottoms of Celestia’s magnificent breasts. She struggled to close her eyes, but she just couldn’t look away. She could already feel her blood pounding in her ears, her breasts straining against her shirt as her own body yearned to join in the princess’ dance of growth.

No, she would’ve told herself a day ago. I can’t. But today… She watched her growing mentor with barely concealed lust and fascination. Today, she couldn’t help but feel as though her entire world had been turned on its head.

Celestia and Luna’s growth was slowing now; both were tapering out at a size that Twilight’s rational mind could estimate at around eighteen feet. Both were just over twice as large as she was, with genitals and bust sizes grown to match. Twilight doubted she’d even come up to Celestia’s waist anymore.

Celestia hungrily dug her fingers into Luna’s rear, her sister’s assflesh spilling through her grasp as she pushed her to the floor. Luna eagerly suckled on the side of Celestia’s neck, the latter gasping and moaning as Luna’s shaft, now towering above both of their heads, continued to erupt with precum. Twilight watched Luna’s crotch with awe, the lunar princess’ titanic balls swelling up with incalculable volumes of seed as they pushed her legs apart. Celestia’s own plump, round nuts sat on top of them, slightly smaller, but no less virile. The two princess’ moaned, grinding against one another, their stallionhoods slapping madly against one another as they grew and grew and grew. Twilight was nearly at her breaking point.

And then Celestia glanced back at her and winked. Twilight’s tentative control shattered.

As the first tendrils of growth snaked through her limbs, Twilight realized that she wasn’t feeling entirely out of control. No: she wanted this. Wanted to feel what Celestia and Luna were feeling. And her body responded to that desire in spades.

In the blink of an eye, she’d increased her size by nearly half. Her clothes snapped and popped around her big, growing body. Her shirt and pants gave out together, her jigs breaking free at the same time that her ass split her pants right down the seams. Twilight let out a cry of pleasure as her shaft, now nearly the length of her leg and still growing, ripped its way out of her pants. It bobbed up to rest between her cleavage, irregular globs of pre as wide around as her fist spurting out with her every breath.

Twilight grunted, her arms thickening, muscles tightening, legs widening. Her thighs pushed together as her balls weighed lower and lower. She felt the seed building up inside of them, the pressure building until she felt like a dam ready to burst.

Her body continued to grow, adding on another few feet in height. She was just barely shorter than Celestia now; her head would have just barely reached the giant Princess’ chin. As her growth tapered off with a few extra inches of size, Twilight groaned, feeling the pressure in her balls mounting even higher. She could feel them sloshing between her legs, gallons and gallons of seed building within them until there was nowhere to go but out.

She cried out, her whole body jerking madly as she hit her peak. Twilight’s back arched over her rear, thrusting her breasts forward around her shaft. It stretched above her by a good foot and a half now, her beanbag chair-sized balls plump and heavy between her legs, dropping down nearly to her shins. Huffing, moaning, and twisting, Twilight came a flood.

An ocean of white burst from her tip: thick, creamy baby batter that erupted from a bulge just beneath her flare. Wave after wave of her musky seed splattered against the walls, the floor, the ceiling—even the other princesses—as Twilight collapsed to the floor, her cum-bloated nutsack squishing gently between her knees. Her hips jerked wildly as she came, her every load easily dozens of gallons in volume. Thick globs of her seed soon covered every inch of the blast zone, rolling down the walls and collecting in huge pools on the tiles.

When Twilight emerged from her post-orgasm haze, the first thing she heard was clapping.

Princess Celestia was smiling. “Very nice, Twilight,” she said. “You look wonderful.”

“Indeed,” Luna said. Her eyes were glittering mischievously. “It has been a long while since I have seen another mare as well-proportioned as you.”

Twilight flushed and glanced down at herself. The first thing she noticed was that her orgasm hadn’t caused her size to go down—if anything, her big body seemed bigger and more solid than any other time before. As her eyes roved hungrily over her figure, she took truly took it in for the first time.

She was bigeverywhere. Her thick, chunky thighs rubbed against one another, forming a soft, curved surface for her massive, plump balls. Even now, after that explosive orgasm, they still felt fat and heavy on her thighs. Twilight bit her lip, her fingers and palm carefully cupping around the side of one of her testicles. She could scarcely believe how big they were.

Her shaft, a monstrous slab of meat longer than she was tall, protruded far in front of her. It was incredibly, impossibly thick, and rested comfortably atop her swollen nutsack. It was drooling a steady mix of precum and jizz, more and more pooling on the marble floor by the second.

Her breasts were enormous; Twilight was comfortably an S-cup, with each massive tit over half as wide as an average pony was tall. They went down nearly to her waist, their sheer weight nearly pulling her back forward. Each of her nipples was larger than a normal pony’s fist, and were achingly, quiveringly stiff in the cool Palace air.

But the rest of her body was more than big—and more than strong—enough to handle her bust. Twilight flexed an arm in awe, watching her biceps bulge out larger than her own head. She was massive—and, she noted, running her fingers over a belly so sculpted that it felt like a row of steel ribbing, built like a tank.

Well, she amended, glancing back over her shoulder. Not quite. Her massive butt jutted out a good four feet behind her tapered waist. Her hips were more than just foalbearing: they stuck out around her with a radius that even Applejack would have been awestruck to so. She bit her lip, lightly tapped one of her globular ass cheeks. A wave of pleasure swept through her, and she nearly lost herself in sensation as her rump jiggled and wobbled madly, her globes of fat assflesh rippling with hundreds of tiny waves.

She glanced up at the ceiling. Even when she was down on her knees like this, she was still a few feet taller than she’d been that morning. Her breath caught in her chest as her proportions really sunk in. She was huge.

That was when she felt a warm pressure on her back, soft fingers trailing their way down her shoulders and down her shoulder blades. Twilight shivered as she felt a rush of hot air against her ear. “It seems so much smaller,” Celestia’s voice murmured, “doesn’t it?”

Twilight’s hands mindlessly moved to massage her balls as Celestia’s snaked their way beneath her armpits. Twilight moaned, her balls throbbing with sudden fullness as Celestia pressed against her back, her arms curving beneath Twilight’s massive bust.

Celestia’s teeth nipped against Twilight’s ear. Twilight groaned as Celestia pinched her nipples playfully, setting her incredible bust jiggling as hard as her ass. “Doesn’t it feel amazing?” Celestia whispered playfully.

“Ooh,” Twilight groaned. “Yessss…”

Her pleasure was only intensified when she felt somepony else suckling on the tip of her shaft. Twilight’s eyes fluttered open. Luna’s lips had latched lightly onto Twilight’s massive flare, her mouth just barely wide enough to cover her massive cockslit. A moan slipped from Twilight’s lips as Luna gulped down the steady stream of her precum, Luna’s own soft, massive tits rubbing against the sides of Twilight’s shaft.

Luna’s own member bobbed gently beside Twilight’s, their thick, veiny surfaces frotting as Twilight’s hips twitched and jerked. Luna may have been a few inches taller, but Twilight’s stallionhood was still a bit larger than hers, her balls bigger and plumper.

Meanwhile, she could also feel the base of Celestia’s shaft against her rump, the solar princess’ jugs surrounding her own shaft and squishing into the curve of Twilight’s back, their radius running all the way from her shoulders down to the curve of her hips. Twilight’s erection was throbbing madly now, more and more precum leaking from her drooling tip. Luna lapped it all up, gulping it down eagerly, her eyes never flickering away from Twilight’s.

“I’ve waited quite a long time for you to join me at this size, my dear student,” Celestia murmured. Twilight gave a muffled whimper, her shaft flaring as Celestia continued to molest her tits, even as she lightly humped Twilight’s flabby rear. “I must admit, it’s certainly made you…”

Her breath was hot and moist on Twilight’s ear. Twilight felt the hairs on the back of her neck sticking straight up.

“...irresistible.” Celestia was all but purring now. “Do you think that you’re ready for your new role?” Her voice sounded playful. “I can promise you, my dear student, that it will be quite—“

Her hand slipped down to Twilight’s crotch. Twilight moaned.

“—quite enjoyable.”

At a soft push on the side of her neck, Twilight turned her head. Her lips met Celestia’s before she’d even turned halfway.

Celestia was a surprisingly good kisser. Then again, Twilight admonished herself, perhaps it wasn’t so surprising—she’d had millenia to practice. She let Celestia take control, melting into the kiss as her former mentor’s fingers roved hungrily across her chest. Celestia’s tongue was warm against her own, her lips wet, her touch hot and electric.

Twilight could feel it again now: a stirring, a heat in her chest. She knew what it meant. The sensation, the pressure of growth continued to build in her gut, swelling up inside of her until—

Didn’t this feel good?

—on impulse, her mind clouded by lust—

Didn’t she want more?

—she gave into it once more.

Instantly, her body surged upward. In a second, she was as big as the other princesses—in another, bigger. Limbs lengthened, muscle fibers swelling and thickening as Twilight’s body pushed upward and outward in every way possible.

Soon, Celestia found her arms being pushed apart by the widening breadth of Twilight’s shoulders, her former student’s butt widening and pushing against her own crotch. On her other side, Luna found herself nearly gagging as a wad of precum the size of her head suddenly burst from Twilight’s tip, her shaft growing by the second.

Twilight moaned, the sensations of growth filling her body. Her stallionhood rose up, stiffening, lengthening, thickening. It managed to wedge itself between her breasts, her monumental tits adding on more and more padding by the second; soon, her bust had swallowed up even her pillar of meat, covering the bottom half entirely and leaving the top half to tower above her chest and head.

Another spurt of pre bubbled from her tip, a steady river flowing down Twilight’s shaft. She squirmed in delight, squeezing her massive tits and letting lakes of titflesh ooze through space between her fingers. Her self-fondling only increased as she pushed past twenty-five feet, her nipples now horribly, achingly stiff. She found herself jerking her hips forward, titfucking herself madly as more and more pre shot up into the air.

Her balls grew fuller and plumper, fat with untold gallons of spooge. Her massive ass continued to grow as well, folding over the tops of her thighs and coming to rest on her quads. Twilight grunted as she pounded her own tits; they already reached below her navel, and were already beginning to brush against the tops of her truly massive nuts. As another growth spurt hit her, sending her shooting up in height until she was at least twice the size of Celestia, she could actually feel her enormous breasts resting on the top of her nuts, the soft, pillowy flesh parting over the base of her shaft and sagging atop her overfilled cum-buckets.

Thrust rudely back by Twilight’s growing ass, Celestia’s let out a choked cry and tumbled backwards. Her own shaft slapped against the floor with a meaty smack, inducing a messy, oversized load from Celestia’s own balls. Part of Twilight’s mind ached for that same release, but somehow, she knew that she was nowhere near finished.

The throne room was an absolutely enormous piece of architecture; yet, Twilight’s growing form seemed to be bringing that into question. On her knees, her head reached up over a third of the way to the ceiling; she had to be nearing forty feet now, and seemed to have no intention of stopping. She squeezed her breasts to her chest, the sudden pressure around her shaft sending a rush of endorphins to her brain. Twilight groaned out in pleasure, huge spurts of precum erupting from her shaft and splattering against the walls and ceiling.

By now, Luna had managed to clamber to her feet, her eyes wide as she stared up at Twilight’s magnificent form. Peeking just over the top of her bust, Twilight managed to make out the other princess’ increasingly tiny form—she only came up to Twilight’s waist now, and if she’d been standing up, it was clear that Twilight’s thigh alone would have towered above the diminutive lunar princess’ head.

A huge spurt of pre burst from Twilight’s tip, splattering against and utterly ruining a tapestry on the far wall. Twilight’s chest heaved, her mind awash in size and power. She thought she’d been big before, but this—this was unlike anything she could have ever imagined. It was like a drug: the bigger she grew, the bigger she wanted to get. And she wasn’t sure how big she could get, but there was no doubt that she wanted to find out.

It was a rush unlike anything she’d ever experienced, a combination of lust, power, and pleasure that mixed into a perfect cocktail of size and arousal. And Twilight loved it, adored it, savored it, drawing it out as far as she could and then letting it flood through her again.

Passing seventy feet in height, she was fast approaching the throne room’s ceiling. Both Celestia and Luna would wouldn’t have been even twice the size of one of her feet. A sudden growth spurt settled that, Twilight’s size nearly doubling, passing one hundred feet, her massive, wriggling feet now each as big as a fully grown alicorn.

The throne room was getting very, very cramped. Even on her knees and pressed against one side of the room, Twilight was still managing to fill most of it. Her cock, almost twice her height, was brushing against the opposite wall, a steady flood of precum drooling from the tip and pooling into a milky-white lake below it. Her huge ass folded over her thighs, smushing against the back wall. It had to be at least three times wider than her waist, her hips widening until “foalbearing” almost seemed an insult. She not only filled up most of the room lengthwise; she filled up most of it breadthwiseas well.

Twilight couldn’t even see Celestia or Luna anymore. Her vision, by now, had become entirely filled up by her own breasts and shaft, not to mention the ceiling that was rapidly rushing down toward her. She felt a sudden weight atop her massive backside, smushed between her wobbling rear and the wall, and wondered if that was Celestia. The thought of crushing her mentor with her bulk, of being so much bigger than not only Celestia, but the room itself—it turned her on more than anything before.

Reaching between her breasts and balls, Twilight began to fervently stroke her massive pole of meat, which by now had to be even more massive than she was. Her moan filled the room. A final surge of growth washed through her body, pushing her up and outward until the top of her head just barely brushed against the ceiling.

Hunched over, eyes closed, and teeth gritted, Twilight felt the floor begin to shake. An ominous rumbling began to spread throughout the room, then through the palace, as her arousal built to an inescapable peak. She was panting, moaning; Celestia and Luna, lost among her huge, magnificent body, were powerless to do anything as Twilight brought herself to the edge—and went over.

With a cry, she went off. An ocean of cum erupted from her shaft, globs of jizz the size of wagoncarts spurting out. Those were the only the heralds of a much larger eruption, though; as Twilight’s cry twisted into a moan of impossible pleasure, a flood of seed bulged upward from Twilight’s balls before releasing directly into the throne room.

It flooded through the door, less a collection of spurts than a single, impossibly large load. Each of Twilight’s “spurts,” barely distinguishable from the others, carried hundreds or even thousands of gallons of cum. Her massive load rose up a good five feet of the throne room before shattering the doors, the pressure of thousands of gallons of her seed too much for them to withstand.

Her enormous balls, each the size of a small house, continued to empty themselves into the palace, flooding first this wing, then the rest of the structure as more and more seed burst from her shaft. Twilight howled, her chest heaving around her tool as more and more of her seed filled the palace, power and heat rippling through her body as she came.

More and more of her seed ripped through the doors, her balls churning, her shaft lurching. An ocean of spooge was filling the palace, Twilight’s monstrous size coming to dominate not only the throne room, but all of Canterlot Palace as well.

Then she felt it: her balls, swelling up to incredible sizes, readying themselves for one final, massive load. Twilight’s breath caught in her chest, her head turning upwards, her horn cracking the ceiling as her stallionhood bulged to twice its width, getting ready to unleash an impossible amount of seed—

With a moan, Twilight passed out.

When she awoke, it was to Celestia’s serene, smiling face.

Twilight groaned. Her head hurt. Wait; scratch that—her everything hurt. She felt sore all over. At the same time, she’d never felt quite so good, either. A warm afterglow had spread throughout her entire body, with warm, fuzzy tingles swirling through her bloodstream.

She groaned again, lifted a hand to her forehead. “Ce..Celestia?”

“Yes, Twilight.” A normal-sized Celestia smiled down at her. She was cradling Twilight’s head in her arms, the other mare’s neck resting in her lap. “Are you alright?”

“I… think.” Twilight grunted, pulling herself up. She blinked around at her surroundings as she slowly returned to lucidity.

“Um,” she said dumbly. “Wow.” The entire room was coated in a thick coat of white. Fat globs of cum rolled down the spooge-covered walls. Though it, too was splattered with seed, the dais of Celestia’s throne was an island refuge above the two-foot sea of Twilight’s cum that still covered the rest of the floor.

“You, ah, left a bit of a mess,” Celestia said.

“I can see that.” Twilight groaned. She could make out the crater-shaped (and -sized) indentations on the walls and ceiling where both her heads—she tiredly snickered at her own pun—had crashed against their surfaces.

Luna came up behind her and set her arms on Twilight’s shoulders. Twilight glanced up and saw that Luna’s face was drenched in her thick, white cream. Luna licked it up with a satisfying slurp. “A most delicious one at that. And,” she added, “an astounding one. I’ve never seen a pony with that much raw power.”

“She unleashed it all,” Celestia said, softly stroking Twilight’s hair. “We should have expected something that big. All in all,” she said, shrugging, “a good start.”

“A good...start?” Twilight blinked, her mind swimming. “Start to what?”

Celestia just smiled. “Well,” she said, “It was very impressive. But—“ she held up a finger, a soft smirk on her face—“You can do better.

“And,” she added, after a moment, “bigger.”

“Oh,” Twilight said. “Good.” She took a deep breath—and then passed out again in Celestia’s arms.

There was a smile on her face.