Twilight Sparkle and the Planet of the Pantsless Pony People.

It was just like a party back at home, Twilight told herself. The sort of thing that Pinkie Pie would put together at the flimsiest of excuses. Then again, a 'welcome to another dimension!' party was a heck of a gimmick. Despite the strange occasion, all the requisite party trappings were there: drinks, snacks, balloons, and so on.

Just … in a castle. That part was different.

But still, her friends were there, and that was the important part. Or, well, her friends' dimensional counterparts. The personalities were the same, even if they appeared a little … different. Twilight wasn't sure if her friends' equine nature was more or less distracting than their naturist nature. More often than she liked, Twilight found herself staring-- either at horns or hooves, or at boobs and butts.

She decided to look at her drink instead.

“So lemme get this straight--” Rainbow Dash stood next to Twilight, either not noticing or ignoring the faint blush in her cheeks. “Your dimension has a Rainbow Dash too?”

“Yes.” Twilight sipped at her sweet punch, and managed to get her eyes up to Rainbow's face without lingering too much on the blue flesh below.

“Is she as hot as I am?”

“Uh.” This time, Twilight's gaze did dip down low enough to take in the sight of Rainbow's toned and tempting body, if just for a moment. “I … never really thought of her like that?”

“Really? Guess that means I'm the hotter one, huh?” Rainbow Dash flared her wings and thrust her modest-but-perky chest forward, dark blue nipples jutting outwards. “Don't think I haven't noticed you checking me out.”

“Sorry!” Twilight took a trembling step back. “I didn't mean to--”

“It's cool! It's more than cool!” Rainbow Dash said. She turned on a hoof and brought both arms up in a flex, adding an extra splay of her wings for good measure. Lean muscle tensed beneath Rainbow's sky blue coat, and Twilight couldn't help but marvel at the display. For scientific reasons, of course. The point of connection between Rainbow's wings and her shoulders was unlike anything from Twilight's dimension, and thus warranted further study. It made sense, then, that her same scientific curiosity would extend lower, to where Rainbow's tail emerged from the base of her spine. In fact, Rainbow Dash must have had the same idea, as she obligingly hiked her tail up and swished it from side to side for Twilight's visual inspection--

“Rainbow!” A purple hand flew past Twilight's field of vision, and came to land on Rainbow's thunderbolt-emblazoned rump with a loud clap. Rainbow Dash squeaked in dismay, and then broke out into saucy laughter.

“What's wrong, Twi?” Rainbow Dash took to the air with a triumphant laugh. “Not getting jealous, are you?”

Twilight-- the other Twilight, Princess Twilight –furrowed her brow and set her hands on her hips as she glared at Rainbow Dash. “I told you, this Twilight's dimension has a lot of cultural differences from ours. Namely, they're a little more … formal about sex.”

“Formal? Like, do they wear ties or something? Rarity tried to get me to do that once.”

“For the record, you'd look darling in a bow-tie and garters.” The white unicorn called out from where she was snuggled into Applejack's lap.

Princess Twilight facepalmed. “That's not what I … nevermind.” She sighed, and shook her head before looking up at Rainbow Dash again. “Just … try to take it slow, alright? I know you're just flirting, but let's try not to make our guest uncomfortable, okay?”

“That's why I'm trying to make her comfortable! Just, y'know, in bed.”

“Rainbow.” Princess Twilight said.

“Or on the couch! Or maybe down in your freaky kink dungeon if she asks--”

"Rainbow!"

"What's the big deal? It's not like I'm trying to fuck her in midair-- I bet she's not good enough a flyer for that."

"Rainbow!

Twilight felt a little jolt circuit through her body as she remembered the … devices in the castle basement. “Uh.” Twilight murmured. “It's alright. I'm alright. You guys shouldn't fight because of me.” She took a step back, only to find herself backing into Fluttershy.

“It's okay, Rainbow means well.” The yellow pegasus murmured, wrapping her arms around Twilight in a comforting (and somewhat enticing, given the skin to skin contact) hug. “Plus, you don't really have to be that good of a flyer to keep up.”

"Um. I'll take your word for it?" Twilight gritted her teeth at the entirely too pleasant sensation of Fluttershy's breath washing over her ear. The dimensionally-displaced girl wriggled out of the embrace as politely as she could, and bit at the inside of her cheek to distract herself from the insistent heat between her legs. “Thank you, Fluttershy. Thank all of you, really. I appreciate all of you trying to make me feel--” She trailed off, glancing from one nude form to another. “--welcome. It's just … this is a lot to take in. I'm still trying to get my head around your, uh, customs. And I'd like to remain open minded. It's just … well, I'd like to take things kind of slow, if that's alright.”

“It's perfectly alright!” Pinkie Pie chimed in. “Just, um … I kinda wish I'd known before, or I wouldn't have invited the boys.”

“Boys?” Twilight and her more regal counterpart said in unison.

The creak of massive iron hinges echoed through the castle.

“There they are now!” Pinkie Pie bounced up and down in anticipation, causing her ample bosom to jiggle in turn. A few moments later, a small crowd of naked men tromped into the main hall.

Twilight gasped, and her eyes went wide. She shouldn't have been that surprised, since she'd already seen most of the guys (colts? Stallions?) nude already, and even 'in action' during the maypole festival. But even then, that had been at a distance. Here, the mass of males were much, much closer.

More studs than Twilight could keep track of filed into the main hall, smiling and joking amongst themselves. They wasted little time in fanning out, heading over to one of Twilight's friends or another. Ponyville must have had a great gym, Twilight realized, as many of the 'guests' had the kind of sculpted musculature typically reserved for, well, sculptures. Broad pectorals. Thick but not-too-thick arms. Washboard abs. And below those … the cocks on display were right on the line between intimidating and enticing. Several of the guests were already erect in anticipation of Pinkie's 'party.'

“Dibs on Applejack's brother!” Rainbow Dash zoomed across the hall, and pounced upon a towering red-coated stallion. Big Macintosh stood his ground as the blue girl curled around him. He kept still-- though once Rainbow Dash wrapped her fingers (if barely) around his shaft, his cock soon rose and hardened to its full, promising length.

“I hate it when she does that.” Applejack grumbled.

“She's just trying to get under your skin, dearest.” Rarity placated Applejack with a teasing kiss along her jawline. “Why don't you let me distract you, hm?” One delicate white hand rose and squeezed at Applejack's breast, earning a little sigh from the cowpony. Cheeks burning, Twilight turned away just as she saw Rarity lean down to close her lips around Applejack's tit--

--just in time to see an ever-giggling Pinkie Pie pressed up between two fit stallions, each hand wrapped around a hard cock, pumping away eagerly. Twilight blushed harder, and staggered back a few steps, only to nearly trip over the white, bodybuilder-huge pegasus-man crouching in front of Fluttershy, gently working his way up the inside of her leg with little kisses.

“You like my pussy, don't you?” The dirty talk sounded strange and alien in Fluttershy's soft voice.

“Yeah.” The big white stallion admitted, and then worked his lips up even higher.

Fluttershy locked eyes with Twilight. “Oh! I'm sorry. I didn't mean to be rude. I can share Bulk Bicep if you like?”

“No! I mean, uh. That's okay. No thanks? I'm … good. I'm good!” Twilight blurted, and wrenched her eyes away before the big guy could get all the way to the apex of Fluttershy's legs. She looked over the burgeoning orgy, and the pony people present peered back at her with puzzled expressions. “I … I should go.” Twilight said. Her heart pounded in her chest as she flapped her wings and made a somewhat shaky takeoff. Fueled by the adrenaline pumping through her veins, Twilight zipped through an open doorway, soaring through the castle's winding corridors.

Somehow, she managed not to kill herself as she careened through the castle. She kept running until the telltale smell of aged paper reached her nostrils. Twilight immediately skidded to a halt, planting her hooves against the stone floor. She backtracked a few steps … and then let out a happy squee. There it was. Her refuge. Her salvation.

Her library.

Or, technically, her dimensional doppleganger's library, but that was close enough.

She wasted little time in easing the door shut-- of course there was a door, how else would her counterpart gotten any privacy for research? Twilight leaned back against the heavy oak, and surveyed the chamber. Bookshelves ran from floor to ceiling, crammed with cloth-bound volumes and wooden scroll cases. Light came in from stained glass windows set high along the walls-- Twilight noted with no small degree of satisfaction that the books themselves were positioned so sunlight never struck them directly. That sort of thing would be bad for the binding (especially in a pre-industrial civilization).

A writing desk sat in the center of the room, along with a handful of battered, high-backed armchairs. The faded and patched upholstery looked entirely out of place in comparison to the rest of the castle's polished décor, which meant they were probably the most comfortable chairs in the whole palace.

The little dragon-creature sitting in one of the chairs certainly looked comfortable.

As the door closed, Spike looked up from the comic book in his claws, and arced a scaled brow.

“Spike!” Twilight said. “Hi!” She said with forced cheer. “I … I guess I'm not the only one who's a feeling a little anti social, right?”

Spike shrugged, and set the comic book on the reading desk before slithering up to the top of the chair, all the better to peer at Twilight.

“Not much of a talker, huh?” Twilight relaxed a little, and walked over towards the purple reptile. She could recognize the familiar mannerisms in the little dragon, even if he was in a completely different form. “But you can understand me, can't you?”

Spike nodded.

“Back in my dimension, you're a dog.”

Spike blinked.

“But you're a good dog! One who can talk! Though that's just because of an accident that happened when I got a liiiiittle bit irresponsible with magic and I may have overloaded and started glowing and cackling but it's alright because I'm okay now!” Twilight twisted her fingers together. “Well, uh, okay as anyone can be when you're stuck in another dimension where everyone you know is an oversexed nudist. Except for you, I guess?” Twilight smiled, and reached out to pat Spike's head, experimentally. The dragon closed his eyes and made a contented little sound at the contact. “I mean, you're a dragon. The anatomy's got to be incompatible.” True to form, Twilight's analytical mind sprung to action, envisioning possibilities. “Please tell me it's incompatible.”

“You're fine.” Princess Twilight said, stepping up beside her counterpart. “Dragons don't lay eggs very often-- one every few decades, at least. Spike just finds our mammalian libido … puzzling.”

Spike nodded.

“He's not the only one, I think.” Twilight flopped down into one of the armchairs. She pulled her legs up to her chest, curling into a little ball. “How'd you find me?”

“I just thought about where I go when I'm overwhelmed.” Princess Twilight settled down in the other chair. “Are you okay?”

“I … yes? I'm sorry I ran away like that. I know we … experimented a little bit, but that was different. More private, you know?” Twilight said.

“I should have talked to Pinkie beforehand. She can get … overenthusiastic.”

“She's like that in my dimension, too. Just … with fewer orgies.” Twilight laughed a little, and wiped the corner of her eye. “At least, I hope so. Who knows what she gets up to when I'm not around.”

Princess Twilight laughed in turn, and reached forward to pat Twilight on the knee. “You should've seen the party Pinkie threw when I first came to Ponyville. I was sore for days afterward.” She smiled at the fond and no doubt scandalous memory.

“I'll … take your word for it.”

Princess Twilight blinked, and then blushed cutely as she realized the tangent she was going on. “I'm sorry. It's just … well, I'm still trying to get my head around on how your dimension operates without sex.”

"It's not that we don't-- it's just--" Twilight sighed, and rubbed at the bridge of her nose. “To be honest, I'm kind of confused on how your society manages with so much sex.”

“It's like … “ Princess Twilight snapped her fingers. “It's like food.”

“Please don't tell me Pinkie Pie's going to come out wearing a whipped cream bikini.”

“What? No. At least, not unless you'd want her to?”

“Let's not get sidetracked.”

“Right.” Princess Twilight nodded. “As I was saying, it's like food. On the basest level, it's a biological requirement to keep you healthy. But--” Princess Twilight held up a finger, already in full lecturing mode. “There's a difference between a quick snack at breakfast and a gourmet seven-course meal. One just fulfills a basic need, but the other … oooh.” A pleasant shiver rolled over Princess Twilight's naked form, rippling all the way out to the tips of her ears and the ends of her wings.

“That … actually makes a lot of sense.” Twilight said. “But, to continue that analogy … imagine you've met someone who's never, uh, eaten anything before. Or … well, maybe they're just used to eating nothing but bologna sandwiches. By themselves. And now you've introduced the bologna-tarian to really, really spicy foods, all of a sudden. That doesn't mean spicy foods are bad, just that I'm not ready to eat a whole bowl of ghost pepper chili in front of all my friends, if that makes sense. Even if they all really like it.”

“Ah.” Princess Twilight said. “I understand. And I'm sorry-- I didn't know Pinkie would invite so many people.”

“They're not … they're not mad at me, are they?”

“No, they're fine. With any luck, most everybody's already … distracted.” Princess Twilight fluttered her wings for a moment, and looked towards the library door.

“Um.” Twilight said as she tried not to look at her counterpart's temptingly naked form. “You can go too, if you want? I don't want to keep you from your … uh, buffet.”

Princess Twilight shook her head. “No, that's alright. To be frank, I can go and … indulge myself with just about anyone in town whenever I like. But it's not every day that I get to talk to a real dimensional explorer-- much less one who looks just like me. I should be apologizing to you for getting ... distracted."

“It's not your fault, you're just trying to make me feel welcome. I'm the weird one here. It's not like you can just cast some spell to make me less uptight.” Twilight said.

“That's it!” Princess Twilight snapped her fingers, and her eyes blazed with inspiration. “Magic!”

“What?”

“I've got an idea!” Princess Twilight bounced to her hooves, and then bounded into the air (movements that set the Princess' anatomy to wobbling slightly, Twilight noted). The purple princess circled around the higher bookshelves, plucking out select books before she landed back at the desk in the center of the library. Using both hands and a bit of telekinesis besides, Princess Twilight laid the tomes out before her, and started leafing through them. Her purple breasts hung down a little as she leaned over the writing desk and swished her tail back and forth behind her. "I think I know a spell that can help you out. Or, well, not a spell so much as an unlikely combination of a couple of other spells that's only possible because of the unique circumstances we're working with ... "

"Just ... what kind of spells are we talking about here?" Twilight said.

"It's hard to explain." Princess Twilight looked up from her reading, a broad and triumphant grin spreading across her features. "But I think you should be able to pick it up pretty quickly. Now c'mon--" She made a beckoning gesture with one finger. "Let me teach you about magic."