Twilight Sparkle woke up early.

Too early.

She opened one bleary eye and looked out the window-- the sun hadn't even risen yet. She debated reaching for her phone, but decided against it-- the electronic glare would no doubt be too bright, and the numbers on the clock would no doubt be too early.

She sighed, rolling to her belly to get more comfortable-- at some point during the night, she must have gotten tangled in her blankets and sheets. Not that she needed them-- the town was in the middle of a record-setting heatwave-- even with the sun still down, the unseasonable warmth still lingered like an oversized sweater. Twilight had forgone her typical flannel pajamas, electing to sleep in nothing but a pair of thin cotton panties. She squirmed, trying to get comfortable amongst the pillows and stray books strewn around her bed, but even the light touch of her panties felt sticky and constricting.

“Mmmh.” Twilight murmured to herself. “At least I locked the door ... “ and with that, she slid the loose panties off, kicking them carelessly to a corner of her bedroom. Properly bare, Twilight briefly reveled in her freedom from briefs. She pulled a pillow under her chin and wriggled a bit to get more comfortable--

“Oh.”

The gentle grind of her hips against the mattress kindled an instinctive, lusty response from Twilight's body. Her body burned even hotter- though this time she knew it wasn't from the weather. Twilight bit the inside of her cheek to stifle a moan as she woke up further, becoming more and more aware of her body. Her nipples tightened, rubbing against the cotton of her sheets. Twilight parted her thighs further, luxuriating in the feel of open air on her rapidly moistening lips. She imagined herself waiting for a lover, offering herself to be ... pleasured. Rutted. Fucked.

But Twilight was alone.

She gave another wanton, needy roll of her hips against the mattress, finally sliding one hand down her belly, to the juncture of her legs. As she pushed her fingertips over her swollen lips, Twilight bit back another moan. The feel of her own digits on her pussy both soothed and aroused her increasingly lust-wracked body.

“Just ... relaxing, that's all.” She told herself. “Perfectly healthy for a girl my age to ... indulge herself.” Perhaps it was just coincidence, but the faint justification only stoked the heat between her legs. Why, it was almost her responsibility to play with herself-- there'd be no way she'd be able to study properly in school the next day if her mind kept ... wandering.

Twilight slid a finger into herself.

She bit the corner of her pillow to keep herself from making more noise, and marveled at the familiar (but certainly not routine) feeling of a finger in her pussy. She bit the pillow harder, then slid a second finger in, filling herself. Twilight worked her hand roughly, almost clumsily as she masturbated, fingers delving into her sex, the heel of her palm mashed up against her aching clit.

Twilight breathed deeper, mewling through her mouthful of cotton, and soon pushed herself past the edge of pleasure, sending a delightful surge through her entire body. Twilight gasped for breath, rocking her hips on her fingers over and over again as she felt every nerve in her body light up, from the tips of her fingers all the way to the ends of her wings and tail.

Wait. What?

No sooner had her orgasm subsided, Twilight was left with a new and certainly different perspective on herself. She rolled to her back-- winced as she put pressure on her wings, and then sat up. Looking down the length of her body, she marveled-- sure enough, her long legs were covered with a fine coat of lavender fur, and terminated in hooves instead of feet. Cautious but curious, Twilight brought her hands up to her face-- sure enough, her nose sloped into a short, blunt muzzle, and her ears poked up through her hair.

The equine features felt odd, but familiar-- which was the only thing that kept her from springing to a blind panic. Instead, she went into a self-aware panic. After all, the last time she had wings and a tail was when she had zapped herself into a dimension full of bipedal (and hedonistic) pony people. Had she somehow blasted herself between dimensions in her sleep?

Twilight rushed over to the full length mirror on the back of her bedroom door, and flicked on the light--

--only to see herself. Her normal, eighteen year old self. Gawky, naked, and even more rumpled looking than usual ... but decidedly lacking in hooves or tails or wings. Twilight looked down at herself, ran her fingers over her bare skin, and shook her head.

“Must've ... must've been a weird dream.” She finally concluded, and padded back towards her bed. She flopped onto her decidedly wingless back, and sighed. “Or maybe a fantasy?”

Twilight let a hand drift between her still-sticky thighs.

A few hours of fitful sleep later, Twilight's phone buzzed with her morning alarm. After a quick check in the mirror for any other unexpected equine features (there weren't any), she went through her morning routine: shower, clothes, breakfast. The morning was maddeningly normal-- which only nagged at the back of Twilight's mind. The dream had seemed so real-- Twilight shivered as a cavalcade of naughty memories came to mind. Still, a glance at the clock was enough to make her forget them, however temporarily. She had another school day to deal with, after all. A few hours of proper study would certainly be a more productive use of her brainpower. And so, with barely a few minutes to spare, Twilight slung her backpack over her shoulders and went out to meet another day.

While morning, it was already getting oppressively warm by the time Twilight got to school. She tugged a little at her cotton blouse to keep it from sticking to her skin, and then smiled as she saw her best friends hanging out in the shade of the school building. Sunset was absent-- which honestly wasn't out of the ordinary, given her tendency to run late.

“Hey Twilight!” Applejack took a moment to size the nerdy girl up. “You alright? Ya look like you've been through the wringer.”

“Just, um. Just had a weird dream, that's all.”

“Oh oh oh! Like one of those dreams where you're on a game show but you don't know any of the answers but you keep on getting them right anyway because the game show was rigged by the secret Chihuahua conspiracy because they wanted you to win so they could steal the lifetime supply of doggy treats?” Pinkie Pie grinned. “'cause I have that one all the time.”

“Um, no.” Twilight said, feeling a blush rise to her cheeks. “This one was ... different.”

“Oh man, you had a sexy dream, didn't you?” Rainbow Dash nudged Twilight knowingly. “You wouldn't be making that face if it wasn't sexy!”

“It ... might have been a little hot.” Twilight flushed a brighter red, then tried to hide it with her hands. “But there's nothing wrong with that! I mean, I'm a teenager with an active imagination-- so, y'know, it's natural, right?”

“Twilight.” Rarity set a gentle hand on Twilight's elbow. “Don't let Rainbow's crass questions fluster you so! You needn't tell us anything you're not comfortable with.”

“Thanks, Rarity.” Twilight smiled, and then blinked as she felt her phone buzzing. She plucked her cellphone out of her bag, looking down at the text message displayed.

Sunset: Not feeling well. Called in sick. See you tomorrow.

“Guess that explains that.” Twilight said, and tucked her phone back into place--

--and when she looked up, her friends were naked.

Twilight almost could have justified it as some sort of prank-- Pinkie, at least, surely could undress in a split second ... but that didn't explain the wings, hooves, tails, and other items of improbable equine anatomy her friends now sported. They still lounged around in almost the same poses they had seconds earlier, just now in half-human/half equine form.

Not one of the five did a thing to cover themselves-- Pinkie Pie almost seemed to be flaunting herself with the way she splayed her legs, revealing the crinkled lips of her sex. Applejack and Rainbow Dash bickered and prodded at each other in some minor argument, each escalating elbow or nudge making Applejack's ample tits sway a bit. Even Fluttershy didn't mind showing off her willowy figure as she leaned against the base of the statue. Her hair and tail (tail?) blew gently in the breeze, giving her the vague air of a classical painting.

“Explains what?” Rarity's ears poked from her exquisitely styled hair (at least that was the same, Twilight thought) as she looked curiously at Twilight. Twilight, in the meanwhile, did her best to keep looking at Rarity's face, and not at the tempting expanses of white-furred flesh beneath. Even with a short, blunt muzzle, Rarity looked as elegant as ever-- though this time, her meticulously plucked brows furrowed in concern.“Are you alright, dear?”

“Sunset's not feeling well!” Twilight blurted. “Maybe there's a bug going around?”

“Oh no!” Fluttershy said, voice heavy with concern. She bent at the waist to place a gentle hand on Twilight's forehead to feel her temperature-- and in doing so, the slim pony-girl's pink capped breasts hung down right at Twilight's eye level. Twilight bit at her lower lip and shut her eyes, though more for her own modesty than Fluttershy's.

“You're not as hot as I thought you'd be.” Fluttershy mused.

“I'm not?” Twilight blurted in indignation. Her eyes snapped open-- and there Fluttershy was, only now far more clothed, and far less equine.

“No fever.” Fluttershy shook her head and stood up straight again. “Have you had any other symptoms?”

“I ... uh ... no.” Twilight fiddled with her glasses and looked around as surreptitiously as she could. Her friends were back to normal: human, wingless, and clothed. Despite herself, a pang of disappointment twisted Twilight's belly. “I guess really didn't sleep very well. But, uh, that's what being a teenager's like. Ha ha?”

“Are you sure?” Fluttershy sank down beside Twilight, putting a hand on her shoulder. “If you're not feeling well, maybe you should go see the nurse.”

“Fluttershy's right, darling.” Rarity closed her sketchbook. “You do tend to push yourself too hard.”

“It's fine!” Twilight blurted, and stood up. “I'm fine! Really.” She clutched her backpack to her chest, feeling her cheeks go scarlet. Her five best friends looked up at her with concerned, wide-eyed expressions. Fluttershy even began to sniffle a little.

“Oh. You're not ... mad at us, are you?” Fluttershy trembled. More than usual.

“What? No! I'm not mad, I'm just ... I'm sorry I snapped at you.” Twilight smiled, weakly.

From inside the school, the morning bell rung, signaling the start of another day. Twilight let out a relieved sigh as she heard it, and forced her smile wider. “Oh hey look at that time to get to class so we can concentrate on learning new things so we can grow into better and wiser people so bye!” And with that, Twilight took off at an awkward bolt.

Once she'd gotten to the refuge of the classroom, Twilight slumped into her desk with a sigh. She took off her glasses and rubbed at her eyes. School was something she could focus on, to keep herself from getting ... distracted again. Twilight took up her seat in the front row, pulling out pen and notebook as she readied herself for a productive day of learning and mental enrichment. The other seniors filed into their seats behind her, though with considerably less enthusiasm (as one would expect from a bunch of 18 year olds).

“Class.” Principal Celestia practically glided into the room, and the low key roughhousing and gossip immediately ceased. Principal Celestia smiled, and raised one placating hand. “Don't worry, you're not in trouble. It's just that Mr. Neigh wasn't feeling well this morning, so I'm substituting for him today. We'll just make this a review session. Everyone please open your books to page two thirty seven ... “

As Principal Celestia started her biology lesson, Twilight's mind began to wander. Back at Crystal Prep, they'd already covered most of what the principal was lecturing about. And so, Twilight's thoughts turned towards something more ... pressing. She twirled a pen in her fingers and then began to jot her thoughts down in her notebook, brainstorming.

Problem: Strange, sexy tactile hallucinations.

Source? -> Drugs? Possible, but not probable. When was I dosed? With what? Such a heavy hallucinogen would most likely incapacitate me.

Sleep? -> Also possible, as sleep deprivation has been known to cause hallucinations. Though that is usually over a matter of days, not hours ...

Dream? -> It's entirely possible I am in some kind of sexy, recursive dream-- though an unusually lucid one.

Twilight closed her eyes, and tightened her grip around her pen as she came around to the most likely (but hardly simplest) explanation.

Magic?

“Miss Sparkle, care to answer the question?” Principal Celestia's voice snapped Twilight from her reverie. Twilight blinked and tightened her fingers around her pen. She looked up with a forced smile, only to feel the facade melt away in an instant at what she saw.

“Boobs.” Twilight blurted.

Principal Celestia was gone. In her place was none other than Princess Celestia: tall, winged ... and completely nude, save for a smattering of golden jewelry more suited for the cover of a cheap fantasy paperback than a high school. The rest of Princess Celestia's goddesslike form was on mouth-watering display: Twilight bit at her lower lip as her eyes traveled from the regal woman's surprisingly sturdy hooves, all the way past her long, shapely legs, and finally (after a brief pause on Celestia's more than ample bosom) to Princess Celestia's face. Despite the pony morphology, the bemused but caring expression on Celestia's muzzle was quite familiar.

“That's one way to put it, though I didn't expect you to use the vernacular.” Princess Celestia said. She proceeded to reach to her own tits and lift them up a little, though it was a slightly awkward gesture, given their size. She flared her wings out slightly for balance, and Twilight bit at the inside of her cheek. Princess Celestia continued her lecture with practiced ease. “For some ponies, breasts, particularly the nipples, are very sensitive.” The principal-turned-pony-princess let her hands linger a little longer on her chest, and then slid them back down her white-coated sides. “Now, what are some other erogenous zones?”

By reflex, a voice at the back of Twilight's head began compiling a list of anatomical terms (while simultaneously wondering how they might interact with equine anatomy). Twilight managed to rein in her academic enthusiasm (for once) and instead focused on figuring out just what the hell was going on. She slumped back in her chair, only to squeak softly in surprise as she jammed her right wing at an awkward angle.

Wings?

Bit by bit, Twilight became more aware of her body, and the situation around her. She closed her eyes, focusing on individual sensations: the soft scrape of her hooves against the tiled floor. The breeze of the air conditioner through her wing-feathers. The swishing of her tail against the legs of her chair.

The feel of her bare bottom against the plastic of the seat.

With a blush and a shudder, Twilight finally registered (or at least admitted to herself) that she was stark naked. A surreptitious glance from the corner of her eye noted that her classmates (at least the other ones she could see) were in the same state: ponified and pantsless. And yet, the sight remained somewhat familiar, as the other students went through the same routines the usually did in class. Two girls murmured and gossiped to each other, even though one of them now had a horn. One guy slumped back in his chair, eyes closed, just shy of snoring. The pony next to him had one hand under his desk, moving up and down in a rhythmic--

Oh.

Twilight blushed deeper, and looked back to the front of the classroom-- where Principal/Princess Celestia stood leafing through a textbook, which somehow (to Twilight, at least) made her curvaceous form even more enticing. Twilight squirmed in her seat, becoming acutely more and more aware of her half-pony/half-human form by the moment, as an inevitable warmth was stoked between her thighs.

“Principal Celestia!” Twilight shot a hand up into the air. “I mean, uh, Princess Celestia?” she added on without waiting to be called on. “I, uh ... I'm not feeling so well. Can I be excused?”

The elegant, ivory-coated goddess arched a brow, and set her book down. “I hope the subject of the review lecture hasn't distracted you, has it?” Celestia had an ever so subtle tone of invitation in her voice. The Principal/Princess (Princessipal?) bent at the waist, ever so slightly, which had an ever-so-interesting effect on her anatomy.

“What? Distracted? Me? No, no. Uh, anatomy and nerve responses are entirely valid fields of study! It's just that, I ... uh ... must have eaten something that didn't agree with me for breakfast. Can I go to the nurse? Please?”

Princessipal Celestia arched one brow, and then finally nodded. “Of course you can, Twilight.” And she made an airy gesture towards the door. “You don't need help making it to Nurse Redheart's office, do you?”

“I can find it, thanks. Sorry to interrupt!” Twilight scooped up her backpack and clutched it to her chest, trying not to think too hard about the two dozen other students in the classroom watching her go. She bustled out of the classroom and shut the door behind her, then slumped against the lockers outside in relief.

“Okay, don't panic.” Twilight murmured to herself. “You've been through this before. Just because one society has hangups about clothes and sexuality doesn't mean all societies do.” In a moment of weakness, Twilight allowed herself to peek through the window to the classroom. Princessipal Celestia had sat down on the desk, and spread her long legs wide, delivering a gynecology lecture with apparently first-hand demonstration.

Twilight ducked out of sight again, and shook her head. “But it doesn't make any sense.” She rubbed at her face, partly to keep her hands from anyplace lower on her body. “That was a whole society, with magic princesses and castles and stuff.This one ... isn't. And it's just flicking back and forth for no reason. Something's ... something's wrong, here.” She sighed, closing her eyes for a moment. “I just need to get more data. Then I can start putting together a hypothesis.”

With this renewed purpose (if not the best idea of how to go about doing it), Twilight nodded to herself, pushing away from the bank of lockers-- only to get the corner of her blouse's sleeve stuck on a hinge.

“Wait, what?” Twilight said, not even registering the sound of tearing fabric. She looked down, marveling at the sudden sight of lavender cotton. A quick look downward verified the presence of her skirt, stockings, shoes-- feet. Not hooves.

A quick (if awkward) bit of flailing later, Twilight verified the lack of a horn, tail, or wings as well. In an instant, she'd turned back to her normal, fully human, fully dressed self. Twilight peeked back into the classroom, verifying that Principal Celestia and the rest of her classmates had done the same. Even the lecture had changed, as Principal Celestia gestured to a picture of a brain, and not more ... distracting subjects.

Twilight tried (and failed) not to be disappointed by that development.

“Or ... maybe I am going crazy.” Twilight murmured to herself.

She headed for Nurse Redheart's office.