Twilight Sparkle and the Planet of the Pantsless Pony People.

The trio walked briskly through the streets of the town, soon joining a growing throng of various pony-people. Twilight bit her lip, and let her gaze roam. She was only observing in order to get some kind of cultural context, that was all.

It seemed a flimsy excuse even as it went through Twilight's mind.

Everyone was bare, and shamelessly so-- though many of the crowd had decorated themselves with little accessories: necklaces, bracelets, belts, sashes, masks, and even what appeared to be occasional instances of body paint. Many ponies seemed to be accentuating their 'assets' with their choices in ornamentation. More than once, Twilight forced herself to look away from the gentle slope of a breast, or the heavy promise of a male member.

Not that anyone seemed to mind her looking, or even notice. Twilight began to identify couples (and even larger, more scandalous groupings), noting the occasional straying hand or stolen kiss. Two pony-people with haircuts analogous to Lyra and Bon-Bon at Canterlot high were particularly guilty of this, erupting into naughty giggles every time one of them would squeeze or tickle the other.

Which was often.

“Howdy!” Applejack's voice cut through the genial din of the crowd. Twilight turned her head, and sure enough, there was a tall, well-muscled woman (filly? Mare?) striding through. Twilight recognized the freckles on this Applejack's cheeks-- only to blush as she realized that matching spots were spattered over the top of her abundant chest as well. A familiar brown stetson perched atop her blonde hair, and a battered red bandanna hung around her neck-- though it looked to be there for more practical purposes than debauched decoration.

“Dearest!” Rarity said, and practically threw herself into Applejack's arms. The taller pony-woman scooped Rarity up effortlessly, carrying her along. Rarity kicked her hooves delightedly, and pulled Applejack in for a lengthy, needy kiss.

Twilight stared.

So there was yet another difference in this dimension.

“You guys are the worst.” Rainbow Dash landed beside Twilight with a little bounce. “You're getting so lovey dovey that even Twilight wants to barf! Isn't that right?” Twilight jumped a little as Rainbow nudged her.

“Oh! Uh. I … I wasn't … I mean, I didn't! I mean, uh. Applejack and Rarity can do whatever they like?”

“I reckon Rainbow's just jealous,” said Applejack. Rarity nodded in prim agreement.

“Pssh. Yeah right.” Rainbow blew a tuft of multicolored hair out of her eyes. “I can't get bogged down with all this 'relationship' crap. I'm a gal of action, in it for the action.” She thrust her hips forward a few times, lewd and ridiculous. “Aaaaaw yeeeeah.”

“Is that so?” Rarity made a show of examining her fingernails. “Then what about that fellow you've been exchanging letters with?”

Rainbow Dash's jaw dropped. “How did you know about Quibble?!”

Twilight blinked. Who?

Rarity just laughed, a melodic, pleasant sound. “I didn't. Until now, that is. Will he be at the festival?”

“Nah.” Rainbow Dash scratched at the back of her head. “He lives in Phillydelphia. I didn't want to make him sit on a train for a bajillion hours.”

“Oh, Rainbow.” Rarity's gaze sized the blue pegasus up and down. “You'd be worth it.”

“Hey now.” Applejack said, and tugged lightly at Rarity's tail, eliciting a squeak from the unicorn.

“Now who's the jealous one?” Rarity cooed.

“I ain't— mmmph.” Applejack couldn't finish her complaint, as Rarity leaned up mashed her lips up against Applejack's once more.

“Save it for the ceremony, you two!” Rainbow Dash shook her head, and nudged Twilight again. “Were they this bad last year?”

“I … couldn't say.”

They made it to a clearing some distance outside the town. Dozens of chest high posts had been driven into the ground in a circle roughly the size of a soccer field. Each post supported a flickering lantern. The hooded lights provided just enough illumination to bathe the clearing in a soft, gentle glow. A vine-wrapped maypole stood directly at the center. Twilight briefly thought about certain theories that viewed the maypole as a phallic symbol. Then again, a phallic symbol seemed redundant when she noticed several of the males standing around the edge of the circle were already in various stages of … excitement.

“Ladies and Gentlecolts!”

A figure walked out into the center of the circle. It took Twilight a moment to recognize the middle-aged woman as the pony-person equivalent to The Mayor. She had at least kept in shape, Twilight mused.

“It is my pleasure to welcome all of you to the seventy-fifth Ponyville Maypole Festival!”

Cheers and applause rolled through the clearing.

“I know you're all very excited, so I won't waste time. Most of you know how it works already.” The Mayor continued. “This circle will gather our personal energy, and channel it into Ponyville's fields and orchards. As we gather together, we will ensure a fruitful year, just as our forefathers did. So, whether you're here with an old lover, or if you're in the mood to find a new friend, just enjoy yourself!”

There was more cheering (along with a few lewd suggestions), until The Mayor held up a hand for silence.

“Remember, if you get tired, all you have to do is step out of the circle. Pinkie Pie has even been so thoughtful as to provide refreshments.”

“Hiii!” Pinkie Pie waved a hand high above the heads of the crowd.

“And now, begin!” Once the Mayor gave the signal, the cheering grew even louder, and the crowd flowed into the designated circle.

Twilight stood still, and stared at the unfolding debauchery. She had thought she had gotten used to the whole 'society without a nudity taboo' thing, but to see the open sexuality on display was another matter entirely.

Ponies paired off in all sorts of combinations. Twilight saw Bon Bon drag Lyra to the ground, the both of them giggling through the whole process. The Mayor settled down in an elegant kneel, and soon several stallions were gathering around her. The Mayor took each thick, erect cock into her mouth and bobbed up and down as eagerly as if she were shaking hands at a fund raising rally. Nearby, a tan-colored stud bent over and presented himself to his blue-coated (and even better hung) friend, who, after slathering a great deal of some shiny, oily liquid over his lengthy prick, eagerly guided himself into his friend's rear. With each passing moment, more and more pony-people stepped into the circle and immediately started climbing upon one another.

“Oh my.” Twilight's wings flared.

Ignoring Twilight's shock (and, in fact, anything but each other), Rarity and Applejack stepped into the circle-- at which point Rarity eagerly pressed her face into Applejack's chest, closing her lips around one thick brownish nipple. Applejack moaned, blonde tail flagging upwards-- and suddenly Twilight became acutely aware of the very smell of her friend.

Rarity perked her ears at the moan, and then slid a hand between Applejack's legs. Twilight couldn't see exactly what the unicorn did, but Applejack soon let out a wordless gasp of pleasure. Rarity pulled away from her lover's chest, and eased the taller cowpony down to the ground. She nibbled lightly at Applejack's collarbone (earning another little squirm from her) and then looked over her shoulder, directly at Twilight.

“Don't be shy, darling.” Rarity hiked her tail, revealing an absolutely lovely derriere, as well as the wantonly displayed line of her pussy. “I like to share.”

“I, uh.” Twilight's heart began to beat faster in her chest, each pulse of blood through her body seemingly raising her temperature. How did a spring evening get so warm? She took a half step backwards, almost startling herself with the jingle of the bracelets around her wrists.

“Dibs!” Rainbow Dash said from where she stood behind Twilight. She rushed into the circle (though not without giving Twilight a hearty, 'good game' kind of smack across the rump in passing) and practically dove forward, happily situating herself on her knees, all the better to lean in between Rarity's offered cheeks. Twilight didn't see exactly what Rainbow's mouth was doing, but to judge by their reactions, both she and Rarity were enjoying it. A lot.

“Oh!” The white coated unicorn said, voice trailing off into a shudder. “Not so fast, Rainbow! I-- oh!”

Twilight clenched her fists tight enough to drive her fingernails into her palms, and turned away. Though somehow, only hearing the moaning and laughter and other … wetter sounds without the images to go with them made the orgy even more scandalous.

More tempting.

“This is insane.” She murmured to herself, forcing one foot (one hoof?) in front of the other as she walked away from the unfolding orgy. “But … insanity can be treated. Yes. All I need to do is to take a properly clinical perspective, and apply just some basic analysis, and then things will make sense like they properly should.”

Twilight ran through what she'd observed and what she knew, turning and positioning the facts like so many puzzle pieces. And then, like one bit of a jigsaw piece fitting into another (and not, Twilight reminded herself, like the various ways everyone else seemed to be fitting into each other some distance behind), it became clear. “That's it! I'm just looking at things from a monogamous, heteronormative viewpoint! Observer bias! I should've known! Different dimension, different culture, duh! It's like they evolved from bonobos, instead of a more aggressive primate! Or, well, whatever the equine equivalents of bonobos and chimps are here. Though how a plains-habitat herbivore developed opposable thumbs is an interesting question in and of itself.” Twilight held a hand up in front of her face and wiggled her fingers. “I wonder if there are any anatomy textbooks back at the library … “

“You can study my anatomy, if you want!” A familiar laugh bubbled out from behind Twilight.

Suddenly, Twilight became very, very aware that she was still standing naked in the middle of a field while the kind of bacchanal worthy of ancient Rome unfolded behind her. Plus, the whole 'pony people dimension' thing.

The corner of Twilight's eye began to twitch.

“Uh. Hi Pinkie.” Twilight turned around. Sure enough, there was a plump, pink pony-person with a smile across her cute, upturned muzzle. A pristine white apron heroically held Pinkie's heavy breasts in check, though not without creating a tempting valley of cleavage which Twilight certainly did not stare at. Somehow, running into Pinkie Pie's pony doppelganger wearing nothing but an apron was the most normal thing that had happened to Twilight that day. “Just how much of that did you just hear?”

“All of it!” Pinkie said, cheery as ever. “Now ask me how much of it I understood!”

“Er ... How much did you understand?”

“None of it!” Pinkie Pie giggled. “But that's okay! Sometimes it's nice to talk to yourself, because then you know at least somepony knows what you're talking about, right?”

“Uh. Yeah.” Twilight forced a laugh. “Right.”

“But you were talking a whole lot! I bet all of that made you thirsty. Here, have some water!” Pinkie Pie reached into a cooler she'd been carrying with her and pulled out a bottle, thrusting it into Twilight's hands.

As Twilight wrapped her fingers around the cool glass, she realized how thirsty she really was. It was a simple matter to uncork the bottle and kick back a refreshing mouthful-- even if a few icy drops of condensation dripped down between her breasts in a not-entirely-unpleasant sensation.

“Thanks.” Twilight managed with a wan smile. “It's … it's been a weird day.”

“These big parties usually are!” Pinkie nodded, causing her pouf of hair to wobble.

“Yeah.” Twilight said, and chanced a glance at the mass of bodies around the maypole. “To be honest, Pinkie, I'm kind of surprised you're not, uh. Celebrating.”

“Oh, I will!” Pinkie wet her lips, and ran her hands over herself, tugging her apron down slightly, to the point that the edge of a dark rose areola could be seen. “I just like to wait 'til after the first rush dies down. Easier to keep track of things that way! It's better for your endurance, too-- we've gotta be here all night, y'know, so things like hydration are important!”

Twilight eyed the bottle of water in her hand.

“But if you wanna get started a little early … “ Pinkie Pie took a step closer, and trailed a finger over Twilight's bare chest, following the path a few droplets of water had traveled moments before. Thankfully, Twilight wasn't drinking at that precise moment, so she didn't accidentally drown herself in surprise.

“Um.” Twilight said. “I … I'm not sure.”

“Kay!” Pinkie Pie said, “Whatever you like! You don't have to do anything-- or anyone – you don't want to! But you should at least try masturbating a little bit in the circle-- you know, for fun!” Pinkie Pie giggled, and pulled Twilight into a bosomy hug, only to plant a surprisingly chaste kiss on her cheek.

Twilight blushed-- but by the time she could get her mouth working again, Pinkie had flounced off, tail swishing from side to side above her broad, jiggly rump. She intercepted a pair of sticky and panting young women, and immediately pushed more chilled bottles of water into their waiting hands. Twilight's eyes slid over to the couples and trios and quartets within the maypole circle … and started walking forward.

She could have made excuses. Something about first hand cultural observation, or a pithy 'when in Rome' statement, or … something. But to be honest with herself, there was only one conclusion.

She was horny.

A simple, biological phenomenon. With slightly different biology, perhaps, but nothing she couldn't deal with. She bit her lip as she stepped into the circle, feeling a mild electric buzz shimmer over her. She picked her way past enthralled couples … and finally found a clear stretch of grass to sit down on. Curious, experimental, she ran her hands over her purple coat-- the feeling was surprisingly soothing. Allowing herself the liberty she'd denied herself earlier, Twilight cupped her generous breasts in her hands, and tugged lightly at her own nipples. She gasped sharply, feeling a thrill course through her from eartips to tail.

She'd have to get used to that.

Breathing shakily, Twilight reached between her legs, tentative fingertips tracing over her pussy. Her folds were wet, wetter than she'd ever felt them-- just another quirk of being half-pony, she told herself (without much conviction).

It wasn't as if she'd never masturbated before. It was just the fact that such … indulgences were fleeting things, to be done in the shower or beneath the covers or possibly slumped in front of her laptop. Not … in the open, surrounded by others cycling through every possible position and pairing Twilight could think of. (And quite a few she couldn't, as the addition of wings and magic allowed for certain complications).

Thankfully, Twilight mused, they were all distracted with each other-- nobody spared her so much as a second glance as she parted her legs wider, and slid a single slim finger into herself. She moaned aloud as the slick walls of her tight sex clenched on that digit.

Twilight squinted her eyes shut and let practiced instinct take over-- she fingered herself insistently, almost desperately, each little curl of her wrist sending familiar-yet-new sensations ripple through her. She leaned back, propping herself against the soft grass with one hand, while Twilight slid her fingers a little higher, teasing at the engorged nub of her clitoris. Soon, Twilight started to work her hand in tight little circles, fixing on that gloriously sensitive bundle of nerves and skin. The bracelets along her wrist clattered gently against each other, as if signaling Twilight's self indulgence.

Her whole body burned with molten tension, tension she desperately tried to relieve with each flick of her fingers. She braced her hooves against the grassy ground and pushed her hips forward, grinding lewdly against her own hand. Twilight's breath came in ragged gulps, as if she were drowning in her own desire. Eyes closed, ears splayed back, jaw clenched, Twilight remained oblivious to everything but her own body.

Without warning, she came.

Any sense of inhibition forgotten, Twilight cried out in triumph. Overwhelming pleasure wracked her body, hitting and flowing over her like the crest of a hurricane wave. Twilight kept her eyes shut through the whole ordeal, as every muscle in her body tensed at the same time. As the torrent of pleasure tapered off, Twilight felt an odd mixture of relief, disappointment, and more than a little pride.

Panting, Twilight collapsed to her back-- only to feel a decidedly unpleasurable jolt of pain as she landed too hard upon her wings. Jolted back to reality, Twilight sat up and opened her eyes.

She found herself sitting in a field of tall, uncut grass. Twilight blinked.

“Oh no.” Twilight stood on still-unsteady hooves, trying to ignore the wet and sticky feeling between her legs. “I didn't jump dimensions again, did I?”

She pushed some of the nose-high grass out of the way, and quickly abandoned that theory. The same nude pony-people from before were milling about in the tall grass with bewildered looks on their faces-- Rainbow Dash and some of the other winged folk had taken to hovering above, pulling couples out of the green tangle as needed.

Twilight's eyes flicked to the maypole-- where it'd been covered in dry, dead vines before, it was now a pillar of verdant green, with white blossoms dotting the suddenly arm-thick vines. It might've been a trick of the evening light, but a quick look towards the treeline made the trees seem notably taller than they had been before.

“Oh.” Twilight held her hands up to her muzzle. “Oh no.” She ducked down into the grass, going to hands and knees in an effort to hide. “The Mayor said something about magic, didn't she?” Twilight murmured to herself. She briefly tried rolling the mathemagical equations in her head, but she soon realized there was just too much she didn't know about the forces at play-- and too much she didn't know about what she herself brought into the equation, given her otherdimensional origins.

“Okay, don't panic.” Twilight told herself, and started crawling in a random direction, hopefully headed away from the maypole (and the mass of confused, grass-stained pony people). “All I have to do is get back to the castle without anyone noticing, and--”

“And what?”

Twilight looked up at … herself. Another Twilight hovered in midair just above the grass, wings splayed out behind her like those of an avenging angel. She was a vision in lavender-- confident, powerful, and faintly glowing with arcane energy. She wore rune-encrusted bracers around both her ankles and wrists, and a silvery circlet wrapped over her brow. These provided the entirety of the other Twilight's attire-- but with the confident way she carried herself, it was like looking at a stranger, or at least a more attractive and successful sibling.

The other Twilight waved one hand impetuously. The overgrown grass of the circle fluttered to the ground, suddenly scythed down without so much as ruffling a hair on the bewildered ponies gathered around.

Twilight marveled at the show of magical power-- and, more dangerously, control.

“I- I- can explain!” she said, desperate.

“I'm sure you can.” The other Twilight said, even as her eyes glowed with arcane power. “Which is why you're going to tell me everything you know.”

Feeling the power rolling off of her equivalent, Twilight backpedaled, raising a hand to shield her eyes. “W- wait!”

Everything went white.