As Twilight walked through the ponified-people version of Canterlot High, “after school activities” took on a whole new meaning. Through one doorway, she saw the drama club rehearsing some period romance-- albeit with a very “method” approach to the love scenes. A tall, broad-shouldered stallion of a leading man (leading pony?) stood in the center of the stage, script held out in front of him with one hand, while the other rhythmically moved over his--

Twilight looked away.

Through an open window, she could see the track team arrayed out on a practice field. Twilight easily picked Rainbow Dash's unique hair color amongst the other athletes-- athletes who were actually dressed, Twilight realized. Or ... semi-dressed, at least. The girls wore tight sports bras in a nod to practicality-- though nothing obscured them from the waist down. They didn't even need sneakers-- what, with the hoof-feet and all. Rainbow Dash led the track team through some preliminary stretches, and soon over a dozen lean, fitness-honed bodies mirrored her. Showing remarkable flexibility, Rainbow Dash bent over, nearly folding herself in half as she stretched her hands out to grasp one ankle, and then the other. Twilight bit her lower lip, vaguely wondering if the way Rainbow Dash's tail hiked up was an involuntary reaction, or if she was deliberately showing off her--

Twilight looked away.

And then there was Pinkie. Glorious, voluptuous Pinkie. She bounced, from the pouf of her hair to her inviting derriere. There was a song to be written about that. But who had time to sing, when one's mouth could be better put to use by just opening wide and--

Twilight looked away.

A warm flush traveled up from Twilight's upper chest, all the way to the tips of her ears, nearly enough to turn her purple hue into a red one. She walked faster, each clip of her hooves against the tile floor a reminder of just how strange things had gotten. The school's rickety old air conditioner (some things never changed) rumbled to life, and cool air washed over every inch Twilight's nude, exposed form. Somehow, that no one so much as batted an eye made things even worse. Twilight wondered how far she could push it, if she could just give in and touch herself, right there in the middle of the hallway. Or better yet, she could just ask Pinkie to do it for her. Twilight envisioned those lovely blue eyes looking up at her from between her--

“We're here!” Pinkie said.

“Oh!” Twilight shook her head, momentarily dispelling the debauched daydream. “Right! The library! The place we are going for research purposes!”

“Or--.” Pinkie Pie clasped her hands together and leaned forward, the pose offering quite the interesting view of her bared bust. “We could fool around in one of the study cubicles? Might be a little something of a ... tight fit.”

“Guh.” Twilight said, staring down at Pinkie for a few long, glorious moments. “How about, uh ... later?” Twilight ventured. “As ... uh, as ... enticing as that sounds, I ... shouldn't.”

“Why not?”

“Because there's a definite possibility that my own dimensional alignment, for whatever reason, is tied to my personal level of arousal, meaning that if I get too ... satisfied, I'll switch back to my home dimension, and I won't be any closer to figuring out what's going on.”

“So ... what you're saying is that I should just keep teasing you so you stay horny so you stay here?” Pinkie Pie leaned against Twilight's side, her curvy form warm, inviting, and smelling vaguely of sweet pastries.

Twilight licked her lips.

“That ... is a logical course of action.” She admitted, even as one of her fingertips traced around one of Pinkie's thick, suckle-worthy nipples. “But--”

“Butt?” Pinkie turned around, hiked her tail.

Twilight grit her teeth, biting back a lusty whimper. “Not ... not yet, Pinkie.” She said, shivering as she did so. “I ... I just need to do some research, first.” As she spoke the 'r-word,' Twilight finally let her academic desires overcome her physical ones (however briefly). Mind over matter, she told herself. “Why don't you ... why don't you get everyone else together? You know, Rarity, Fluttershy, and the rest? That way, once I have a better idea of what's going on, I can share my findings, and we can decide what to do from there.”

“That's a great idea! That way, we can all do the glowy thing and shoot magic lasers at whatever the problem is!”

“I'm hoping it won't come to that.” Twilight said with a wan smile.

“In that case, we can just have sex instead!” Pinkie Pie clapped her hands, cheery.

Twilight stared. “Wait what.”

“Don't worry, I'll take care of everything.” Pinkie winked conspiratorially to Twilight, then spun around on one hoof to start bouncing down the hallway again, each joyful hop causing her tail (and posterior) to wiggle in opposite directions.

Twilight looked away.

After all, there was research to be done. She walked through the doorway to the library, and took in a deep, bracing breath. The smell of aging paper and dried-out binding glue filled her nostrils with a comforting, familiar air. Oh, sure, everyone in the library was a stark-naked equine-humanoid hybrid ... but at least they were quiet.

And the books were the same.

Soft-hooved, Twilight walked over to a random shelf, reaching out to run her fingertips over the books there, as gentle as she'd be with any lover. No, gentler, as she had no desire to just grab onto a book and ride it until--

“Looking for something, Miss Sparkle?”

Twilight turned. Gasped. As, there, standing before her, was none other than Vice-Principal Luna. Or, well, the pony-person version thereof. She looked more princess than administrator, standing tall and regal, her hair and tail both billowing out in some unseen, unfelt breeze. She wore little, which was more than Twilight could say-- bracers of matte-dark steel protected Luna's wrists and shins, matching the polished gorget at her throat. That, however, was the full extent of her attire-- Luna's toned form reminded Twilight of some sort of warrior queen, a barbarian with no such need for civilized trappings such as 'pants.' Twilight forced herself to look up at Vice-Principal Luna's face-- only to see the wire-framed glasses perched upon her pony-muzzle, which made Twilight's knees go shaky for a completely different reason. Everything about her radiated authority, radiated power-- Twilight couldn't help but dredge up half-remembered quotes from old fantasy novels, as somehow they were the only way to really describe her.

Hither came Luna the Librarian. Starry-haired, sullen-eyed, a scholar,, a reaver, a slayer, with gigantic melancholies and gigantic mirth, to tread the embossed tomes of the reference section under her sandalled hooves ...
“I said--” Vice-Principal Luna's authoritarian voice cut through the quiet of the library (not to mention Twilight's daydreaming). This did not exactly help. “Are you looking for something, Miss Sparkle?”

“Vice-Principal Luna!” Twilight forced a smile, and tried not to picture herself clinging to Vice-Principal Luna's thigh while a thunderstorm raged in the background. “I, uh, didn't know you worked in the library. I'd think you'd be ... you know ... Vice ... Principal-ing.”

“Miss Bookmarque had a prior obligation, so I am supervising the library for the time being.”

“Oh! Well, that's really nice of you.” Twilight resolutely looked up at the Vice-Principal's face, doing her best to ignore the rest of her. “But, uh-- I was just looking for some books on magic, that's all.”

“Magic?” Vice-Principal Luna arched a brow. “I didn't think you'd have an interest in it, Miss Sparkle.”

“Really?” Twilight blinked. “Well, um-- I just like to broaden my horizons, that's all. Always good to learn new things, right?”

“Indeed.” Vice-Principal Luna shrugged her bare shoulders, causing her wings (she had wings!) to mirror the gesture. “I believe the books on magic are over there, at the far end. Bottom shelf.” She pointed to a row of shelves in the non-fiction section.

“Really?” Twilight perked her ears. “Thanks!” Her bibliophilia soon overpowered her other -philias, and Twilight dashed off for the aforementioned bookshelves. She sighed pleasantly as she stepped into the shadow of the stacks, comfortably surrounded by printed text, just waiting to give up its secrets.

Twilight skimmed the titles, searching for something, anything that might help. She hadn't memorized Canterlot High's entire library catalog (yet), but she knew enough to pick out the titles that didn't belong there, archaic-looking tomes haphazardly crammed in between glossier, more modern texts. The Rise and Fall of the Crystal Empire, Exotic Beasts of the Everfree Forest, A Confederacy of Discords, and more. Twilight picked them up as she went along-- they might not be directly about magic, but their sheer, incongruous presence could be a clue in and of itself.

Finally, Twilight made it to the end of the row-- where, sure enough, a book with 'MAGIC' emblazoned on the spine beckoned her on. Twilight crouched down, reached for the book--

“And just what do you think you're doing?”

Blue hooves stepped into Twilight's peripheral vision, and she soon looked up to find herself looking up at a slim young woman with a light blue complexion and a haughty expression on her muzzle. She wore a star-embroidered wizard hat, along with a short cape in matching fashion-- though she kept the cape thrown back over her shoulders, so it did nothing to conceal the shapely body beneath.

“Research?” Twilight tried to ignore how awkward it was to find oneself at eye-level with another girl's pussy, to little avail.

“Bah! The Great and Powerful Trixie can see through your futile deceptions!” The wizard-hatted pony-girl planted her hands upon her hips, and laughed with such gusto that it set her perky, upturned breasts to jiggling.

“Quiet.” Vice-Principal (and temporary Librarian) Luna leaned around the corner, glaring. Trixie shut up, while Twilight began to think detention might not be quite so bad, in perspective.

“A-hem.” Trixie said, if at a lower volume. “If you're trying to show me up, don't even bother. I mastered every illusion in every one of these books before I even had my cutie mark.”

“You-- what?” Twilight said, and picked out a magic-book at random, reading its title: MAGIC AND LEGERDEMAIN TO FOOL YOUR FRIENDS! She paged through the book-- and sure enough, the diagrams were of things to do with cards and coins, rather than how to harness the arcane energies of the universe to circumvent the laws of physics. “Oh.”

“That's right!” Trixie flicked her hand just-so, making a deck of cards materialize from seemingly nowhere. She shuffled the cards, only to fan them out in ascending order (hearts to spades), and then collapsed the deck, making it disappear again.

Twilight blinked, realizing that the magic trick she'd just watched was more difficult given Trixie's lack of sleeves (or much other clothing, for that matter) to hide things in. “That's ... actually pretty impressive.”

“Of course it's impressive! The Great and Powerful Trixie is unparalleled in the realm of the mystic arts! So don't even bother.” Trixie huffed. “Besides, it's not as if you don't have enough on your plate already. What, with the world-saving and all. Hmf.”

“World saving?” Twilight said. “What are you talking about?”

“Oh, don't play modest. Everypony knows what you get up to every couple of months. First you turned Nightmare Moon back into Vice-Principal Luna--”

“I-- but-- that didn't happen!”

“Oh, I suppose the rest of your friends helped too, sure. And then you all got together when Discord busted out of that statue, and then there was the business with Sombra ... and that's just the big stuff. Honestly, Twilight, while some ponies might be more than happy to indulge you by telling you how great you are, the Great and Powerful Trixie honestly has better things to do. So just go ahead and put that book back on the shelf, and go find yourself another villain to vanquish, hm?” Trixie waited until Twilight put the magic book on the shelf (not that it'd do her much good anyway) and turned around with a swishing of cape and tail.

Twilight's eyes lingered on the departing pony-girl's derriere-- only to start blushing harder as she realized she was staring. “Aaaargh!” Twilight dropped her books and rubbed at her face with both hands. “Why does everyone here have to be so hot?”

Twilight made a quick circuit of the library, but had no luck in finding anything to explain just what was going on. If anything, the strange inclusion of older texts on strange subjects just made the whole situation stranger. After about an hour of fruitless searching, she gave up and went outside--

--only to find her friends waiting for her.

If she closed her eyes, Twilight could pretend that it was normal: Pinkie Pie, Applejack, Rarity, Fluttershy, and Rainbow Dash, all lounging around the statue on the school's front lawn, chatting, laughing. But even the tiniest peek would show things to be entirely different-- what, with all five of her friends now bearing equine features, and not a stitch of clothing between them to hide it. Voluptuous Pinkie. Amazonian Applejack. Glamorous Rarity. Sleek Rainbow Dash. Willowy Fluttershy. If anything, looking at all five of them at once was a relief, as Twilight honestly had too much to take in to be caught staring at one body or another.

“There she is!” Pinkie Pie said, and immediately set about bouncing with her usual distracting enthusiasm. “Over here, Twilight! It's us! Your friends!”

“She knows who we are, Pinkie.” Rainbow Dash said.

“You didn't talk to her earlier!” Pinkie Pie said. “I just wanna make sure everything's okay!”

“It's ... fine, Pinkie.” Twilight lied as she stepped closer. “I'm just ... trying to figure some things out, that's all.”

“And that's why you went to the library!” Pinkie Pie beamed. “So, did you find out what's going on?”

“Not ... exactly.” Twilight said. “I didn't find the exact reference material I was looking for, but I did learn a couple of things anyway.”

“Like what?” Applejack said, leaning forward and pushing her hat (her only article of clothing) upward.

“It's ... hard to explain.” Twilight said with a dejected sigh. “Mostly because I'm not entirely sure of what's going on myself. The long and short of it is, I think I might be accidentally traveling between dimensions. Again.”

“Again?” Fluttershy said.

“Like I said, it's complicated. But the difference here is that, for whatever reason, the dimensional shifts are tied to me. Personally. And, um. Intimately.” For the first time, Twilight realized five of her best friends (or at least their equine dopplegangers) were staring at her naked form.

“What's that supposed to mean?” Rainbow Dash said.

“It means that the dimensional shifts tend to happen when I'm ... horny.” Twilight bit at her lower lip.

“That's it?” Rainbow Dash blinked. “Because if it were me, I'd be like switching planets all the time.” She grinned, flaring her wings and spreading her legs to show off, shameless and proud. “Seriously, I'd be on like Mars by now.”

“Please, Rainbow. Can't you see that Twilight is serious?” Rarity scolded. She slid off of her seat, then strutted over to size Twilight up. “Honestly, dear, look at you. Are you alright? You're wound tight as a spring. Dimension magic or no, getting this worked up can't be good for you. When's the last time you came?”

“The last time I ... oh! That was ... uh ... at the nurse's office? Just a ... few hours ago, I guess?”

“That long?” Rarity said, aghast. “Oh, Twilight, you poor thing-- no wonder you're all in a tizzy. Please--” She set a soft, gentle hand upon Twilight's arm, but the fleeting contact was enough to send a red-hot jolt coursing through Twilight's body. “--can we help you, darling?”

“Yes.” Twilight said, desperate, only to clap her hands over her muzzle in horror. “I mean. Uh. You don't have to--”

“But we want to, darling.” Rarity took a step closer, and the sweet, intoxicating smell of her perfume filled Twilight's nose. For a brief moment, Rarity looked over her shoulder at the other four girls. “Isn't that right, ladies?”

The others just smiled and nodded in agreement, moving in closer, surrounding Twilight, albeit in a friendly way.

“Oh.” Twilight bit at her lower lip. “Then, uh. If you guys really want to--”

“We really want to.” Pinkie Pie said with a sly smile.

“--I guess I've learned enough that it's okay if I go back to the other dimension.” Twilight added on.

“Please, Twilight.” Rarity leaned against Twilight's side, nuzzling at her neck, gentle and affectionate. “There's no need for justification.”

“I dunno, Rarity!” Pinkie Pie said, cuddling in against Twilight's other side. “Maybe she has a kink for technobabble? Do you have a kink for technobabble, Twilight?” Pinkie Pie reached out and gently traced a finger over the outside of Twilight's arm. “Because if you do, I'd totally love to reverse your polarity, if you know what I mean.”

“I don't think that'll be nessescary?” Twilight said with a puzzled blink.

“Okie dokie! Normal dirty talk it is, you sexy monster. Rawr.” Pinkie gave Twilight a toothless play-bite on the shoulder, eliciting a throaty moan.

“Mmm, so it's decided, then.” Rarity put a gentle hand to Twilight's chin, turning her head towards her for a gentle kiss. “Now come on, let's find someplace more comfortable. For as fun as ravishing you out here in the open might be, I'd rather not get any grass stains in my coat.”

“Didn't bother ya last time ya came ta visit.” Applejack said with a playful wink.

“Quiet, you.” Rarity narrowed her eyes at the farmpony with a look of equal parts annoyance and adoration.

“C'mon!” Rainbow Dash chimed in. “My house is only a couple blocks from here, and both my parents should be working late, so we'll have the whole place to ourselves!”

The term 'stampede' wasn't entirely accurate, but it was close. The few blocks from the school to Rainbow Dash's house went by in a blur. Her friends laughed and chatted and jostled at each other like any other bunch of eighteen year olds would, but there was always someone on either side of Twilight with an affectionate arm around her waist, or even a hand on her ass. Twilight savored the contact, each little touch and caress kindling a fire in her chest.

Finally, they came to a modest little ranch house-- the front door was unlocked, Twilight noticed –and then the six of them wound up in what could only be Rainbow Dash's bedroom. Rock & roll posters and flyers covered the walls, and a large (and unmade) bed was pushed up into one corner.

“So,” Twilight said, blushing all the while, “where do we-- mmf!”

Her question was cut off as Rarity kissed her, lips and tongue hungrily gliding over her own. Twilight made a muffled, pleasured little sound, and parted her muzzle so Rarity could do as she wished. Almost as an afterthought, Twilight slid her backpack off of her shoulder and tossed it on Rainbow Dash's bed. Rarity slid a slim hand up the inside of Twilight's thigh, fingertips coming to barely graze the warm folds between her legs. Twilight shivered at the touch, then scooted her hooves a little wider to offer easier access.

“Oh, darling-- you're positively soaked.” Rarity broke the kiss, but stood close. She leaned her forehead against Twilight's, causing their horns to touch-- causing a strange but not entirely unpleasant hum to course through Twilight's body. “It's a good thing we've got you here, or else you might have exploded, worked up as you are.”

“That ... doesn't happen, does it? Ponies getting so horny they explode?” Twilight said.

“Let's not find out.” Rarity murmured into Twilight's ear.

“Hey, don't hog her all for yourself!” Rainbow Dash said, slipping around to stand behind Twilight. The lithe athlete ran her hands up the outside of Twilight's legs, up her sides-- and then over her back, to her wings.

“Rainbow?” Twilight blinked. “What are you-- oh.”

“You've got awesome plumage.” Rainbow Dash cooed, running her fingers through Twilight's feathers. The sensation was strange, alien ... and very pleasant. Rainbow Dash certainly knew what she was doing as she leaned in, tracing her lips over Twilight's spine, seeking out the sensitive spot where her wings joined her back.

“Thanks. I think?” Twilight squirmed a little, then relaxed, allowing Rainbow Dash to do whatever she wanted.

Applejack soon sauntered over, and Pinkie Pie followed, both of them licking their lips. Applejack slid downward in front of Twilight, and then leaned forward. The brim of her hat obscured what she was doing-- but soon enough, Twilight felt Applejack lavishing eager attention onto her sodden pussy. Applejack pushed her tongue between Twilight's folds, tracing the tip up and down, pleasuring her. Twilight's knees buckled, and she leaned back against Rainbow Dash and Rarity for support.

Pinkie Pie, meanwhile, got down on hands and knees and scooted around behind Twilight, wedging herself in between Twilight and Rainbow in a slightly awkward (but not entirely unpleasant, given all that warm, soft touch) position. “Double team!” Pinkie Pie said, and before Twilight could correct her (as things had gotten to the 'quadruple-team' point by then), Pinkie grabbed a handful of Twilight's tail with one hand, spread Twilight's cheeks with the other, and nuzzled in beneath her tail.

“Oh!” Twilight squealed, looking back over her shoulder. “Pinkie, you're ... there?”

“Mmmhmm!” Pinkie murmured, and then leaned in further, tracing her tongue in little circles around Twilight's pucker. Twilight gave a breathy, surprised moan-- the contact was different, but not altogether unpleasant-- just another sensation to lose herself in. And lose herself she did, savoring the hot, electric thrill of being the center of attention, pleasured by her friends--

“Um, Twilight?”

“Mmmh?” With no small degree of effort, Twilight forced her eyes open so she could look at Fluttershy. Gorgeous, naked Fluttershy, with her slender build, perky breasts almost (but not quite) concealed by the long curtain of her pink hair. She stood off to the side, wringing her hands together.

“Could you ... um ... do something for me?” Fluttershy said.

Twilight rolled her hips against Applejack's gently pushing tongue, and nodded. “Anything.” She said, and meant it.

“It's nothing too hard.” Fluttershy stepped forward, and gently took Twilight's hand between both of hers. “I just ... it'd just be nice if you could touch me. Here.” And she guided Twilight's hand downwards, over her belly and between her legs.

“Okay?” Twilight said. She turned her palm upward-- and Fluttershy did the rest, guiding two of Twilight's fingers into her pussy. Twilight marveled as her digits slid right into Fluttershy's slick, hot sex-- how horny had she gotten, just by watching? She curled her fingers, and Fluttershy's mouth parted in pleasure. She looked up at Twilight, and sighed again. “More. Please?”

Twilight obliged, and started curling her fingers in little circles within Fluttershy-- though the pink-haired girl did most of the work, holding Twilight's wrist in place as she spread her stance, fucking Twilight's typist-strong fingers.

Between the enthralling sight of Fluttershy riding her hand, and the combined efforts of her other friends, Twilight did not last long. Pent up from a day's worth of sexy spectacle, Twilight finally found her much-needed release. She came, hard and repeatedly, her entire body trembling. Her pussy clenched down on Applejack's lips, while her wings flapped uncontrollably-- which only made Rainbow Dash laugh.

Twilight's muzzle hung open as she let out warm, breathy, wordless gasps-- the waves of pleasure finally died down, and she collapsed against her friends, helpless and weak. One by one, the other girls drew away from Twilight's body (though Rainbow Dash had to drag Fluttershy off of Twilight's hand before it started to cramp) and eased her down onto the bed.

Sticky, sweaty, and satisfied, Twilight stretched out. “That ... “ she panted out once she remembered how to speak. “That was nice.” She shivered a little as an aftershock of pleasure coursed through her body, and then looked up at her friends. “Thank you.”

Her gorgeous, nude, and equine friends.

Wait.

“Hold on.” Twilight sat up, lust-fogged mind clearing. “I just had an orgasm. Several orgasms.”

“Well duh!” Rainbow Dash rolled her eyes. “That's the whole point!”

“But ... according to my earlier observations, I should have switched back to the other dimension by now. But I'm still here.”

“Lucky you!” Pinkie Pie said, and leaned up to kiss Twilight's knee. “Wanna go again?”

“Maybe?” Twilight admitted. “I mean, uh, we could replicate the ... experiment, but I need to catch my breath, first.” She scooted back on the bed, propping herself up with a few pillows. “But before then ... I need to think. I've got to be missing something here. I just wish I had someone to compare notes with--” she blinked, and snapped her fingers. “Of course! I was so distracted all day, I didn't think to call Sunset Shimmer!” She nodded, resolutely, and then grabbed her backpack, rummaging around inside. Textbooks, notebooks, pen, paper, other sundries (including an abacus, strangely enough) ... but no phone. Or even a charger, for that matter.

“Shoot.” Twilight huffed. “I must have dropped it somewhere back at school.” She zipped her backpack shut, and shook her head. “No sense worrying about it now-- can I just borrow one of you guys' phone?”

The five other girls looked down at Twilight with varying levels of confusion.

Rainbow Dash spoke up first.

“Uh. Twilight? What's a phone?”