Party Crasher

For several years now, on her birthday, Granny Smith has thrown an anonymous sex party at the Sweet Apple Acres barn. The party is particularly specific: before the party begins, each attendee must submit a single strand of their mane to Granny Smith, Pinkie Pie, or Twilight Sparkle, who then log each pony in attendance, and give all of the strands to Zecora for adding into three massive brewing cauldrons - one for stallions, one for mares, and one for ponies who don't mind a bit of gender-swapping hijinx.

When the potions are complete, each pony is blindfolded and given a small flask of the liquid to drink from their respective batch, after which they are led to a seat to wait for the party to begin. At roughly 6 PM, a unicorn - usually Twilight Sparkle, who is often a participant herself - casts a catalyst spell over the room that activates the potions, magically swapping every pony who imbibed the potion with another pony who also drank from the same batch.

The magic fades after eight hours, and at roughly 2 AM, the ponies will find themselves back in their real bodies. This often ends with ponies waking in bed the next morning next to their unmasked lover from the night before, learning their true identity in the process, and several ponies have found their soulmate through this ceremony.

But not everypony is always so thrilled with the results.

"Rainbow?!" Bow Hothoof stood at the door to his daughter's Ponyville cloudhouse, shouting her name. "She's probably still asleep," he remarked to his wife.

"It's your parents, dear!" Windy Whistles called out, knocking on the door a second time. "We're coming in!"

Barging in uninvited was a habit of theirs. One that Rainbow herself had mastered. Now that the relationship between parents and child had been repaired, it was fairly common for Rainbow's parents to visit without any prior announcement. In absence of Rainbow welcoming them inside, Bow pushed open the door that Rainbow always carelessly left unlocked.

As cloudhouses often were, thanks to the ease of maintenance, the entire place was in pristine condition - debris could just be swept off of the cloud-proofed carpets and furnishings, leading all unwanted detritus to be blow off into the wind below, and a constant breeziness from the unsealed walls always kept the place smelling fresh.

"Rainbow?" Windy called out, walking back toward the living room.

Feeling peckish, Bow opened the refrigerator to see if there was anything worth snacking on as Windy wandered the rest of the house. Predictably, Rainbow had a lot of leftover food inside - some of it already long gone bad. A bowl of unfinished salad - two days old, according to the date Rainbow had written on the plastic wrap - called out to his appetite. If he didn't eat it, Rainbow would probably just let it go to waste, like the rest of the fridge.

He sat down at the table and began digging into the meal while Windy's voice continued to float on the air. No signs of Rainbow. A flier on the table caught his eye - one with a couple of ponies engaging in some steamy makeout. Hardly the kind of content Rainbow would have been into, surely?

Wiping his mouth with a hoof, he pulled the flier closer to read it.

Granny Smith's Birthday Bash

Come join us at 5:30 PM on Sunday
as Granny Smith celebrates her birthday
in her own special fashion - with the annual
Ponyville Ultimate Secret Sex Yoke Party!

Thanks to the power of magic,
when you come to this event,
nopony will know who you really are!
Engage with ponies you might only have
dreamed of having a chance with!
Find the partner you never knew you wanted!
Try that kink you never got a chance to try!
At the end of the day, everyone goes home happy.

No pregnancy risks!

Bringing a +1 to the party is absolutely required.
Prudish ponies are advised to avoid
Sweet Apple Acres area during the party.
Don't be late!

"What the heck is a sex yoke?" Bow wondered aloud.

Windy had already given up on finding Rainbow Dash and returned to the kitchen. She scanned the flier quickly. "To be yoked together," she said, nodding. "One of those new slang terms the younger generation has started using, I think, but the roots go back to when ponies used to drive the cows to pull wagons." She shook her head. "I'm pretty sure they're only using that term for the acronym."

Bow stared at the flier a moment longer, and then burst out laughing. "Well, Windy, what do you think? Is Rainbow there?"

"It does sound like something she'd do. And it is Sunday... It's been a while since our swinger days, but I think I could get another round in, if you're down for some fun."

Bow leaned down and kissed her on the lips, then pulled away. "That's what I've always loved about you." He looked down at the flyer. "It could be fun, but it does say not to be late. It's already 6:00."

"Oh, who cares?" Windy rolled her eyes. "Every party flier says not to be late."

There was certainly some kind of party going on as Bow and Windy descended upon Sweet Apple Acres. Loud, thumping music was coming from a large set of speakers outside the barn, and ponies of both genders were bumping, grinding, or otherwise moving to the rhythm.

It was rude to simply cannonball into a party, so Windy and Bow landed a short distance away and walked their way in. They decided to split up and enjoy themselves separately, and within just a few moments, Thunderlane trotted right up to Windy. Bow smiled at the thought of his wife getting railed by a Wonderbolt. She'd be having a wonderful night.

Meanwhile, Bow continued to explore the premises. There was a giant red barn in the center of the festivities, after all. He peered in through the doorway to see a debaucherous celebration the likes of which he hadn't seen since college. A veritable orgy of mares and stallions having sex in a semi-public fashion!

Almost immediately, a very drunken earth pony mare grabbed him by the neck. "Hiya, handsome," she breathed, the strong stench of alcohol causing him to wonder if second-hand intoxication was a real thing. He had to admit, apart from her drunken demeanor, this mare was smoking hot. Her purple coat and mulberry mane, and berry-themed cutie mark got him thinking about the fruits of passion almost immediately. "Would you like to play?"

He couldn't help but notice her tail was already flagged and cum-stained. He'd never told Windy, but his favorite kink was to be the one to claim a mare after she'd already been taken. Some called it sloppy seconds, but to Bow, it was a matter of pride: a mare that was already happy to have been thoroughly fucked, and yet she wants more because the first wasn't enough of a stallion for her. It was empowering.

The mare had definitely noticed, too, as his cock had begun to descend from its sheathe immediately. "That's what I like to see," she purred. "Shall we find a private place and take care of that for you? Or do you want to do it right here?"

"Uh," Bow hesitated. Though he’d attended such events before, he wasn't big into overly public displays - these kinds of parties were great, but there was pretty much always a private room somewhere that could be used. "Can we find a private space?"

The mare beamed, and then turned around, her tail wafting the stench of sex right across his face. His cock went rigid, immediately. She was definitely fertile and needy. "Follow me, big guy," she said, staggering in a not-so-straight line toward a wooden door that appeared to be... an outhouse or something? She pushed the door open and gestured for him to follow.

Bow balked only for a moment as her glistening, cum-drooling slit called out to his baser instincts. He stepped into the room behind her and closed the door. To his relief, the room wasn't an outhouse - which, in hindsight, made sense, because it was inside the barn still.

"Come on, Big Boy," she said, spreading her legs in the classic head-down, ass-up, flagged-tail position. "Don't leave me waiting."

Bow didn't need to be asked twice. He reared up and immediately thrust himself into her warm, wet depths. She hissed in satisfaction as he hilted himself, and then he immediately began thrusting into her with abandon.

Her pussy clamped down in orgasmic convulsions almost immediately, and in that state it didn't take long for him to reach his peak as he fired off inside of her shortly after. He bit down on the nape of her neck as he unloaded a copious amount of his jizz into the mare, and she collapsed to the ground as her orgasm passed, panting heavily.

"Well," she breathed. "That body's a quick shot. Sorry you got stuck with that."

"Nonsense, that was incredible, miss... uh... what's your name?"

The mare shook her head and then her mouth opened wide. "If you want to know who I am..." she yawned. "You're going to have to take me to a hotel and..." she yawned again, laying her head down on a pile of straw in the corner. "Wow, this body is really drunk. I think I'm gonna pass out."

Bow frowned. "You don't have to drink if you don't want to."

She giggled. "No, it was drunk when I got swapped. I'm... pretty sure she's always drunk."

"Huh?"

Her eyes drifted closed. "The body swap, remember?" she mumbled. "The reason everything here is anonymous?"

"Oh, right," Bow agreed. Body swap? Is that how they retained anonymity at this party? Wow... that was hot. "I get it."

That must be why they weren't supposed to be late. Which means he couldn't let on that he hadn't been swapped. That was fine; he could do that.

"Thanks for—" Bow started - but the mare was already snoring softly. "Good night, miss," he excused himself and backed through the door.

Fortunately for himself, he wasn't a one-shot-thot. In a closed space like the barn, with the scent of mares in heat sent his body into overdrive, and it was already hard at work putting another load in the chamber - he just needed to find another mare to fire it into. He smiled at himself, remembering the flier’s bold proclamations.

Pregnancy wards were the best, and he intended to make the most of it. But first, he needed to let Windy know about the rule.

On any other night, Rainbow Dash would never wear her mane so immaculately styled. Fancy mane styling wasn't the way she did things, but tonight, seeing those purple curls bounce in her peripheral vision as she slowly descended the staircase made her smile. Not because she liked how it looked, of course, but because of what it attracted: stallions.

The pleasant, but unsatisfied soreness in her nether region - courtesy of somepony who currently looked like Davenport, the proprietor of Quills and Sofas - reminded her that she wouldn't be the one feeling it in the morning, either. She spoke a silent apology to Rarity in her head, and a quiet hope that Rarity was also having a great time tonight.

Her partner had, infuriatingly, passed out within moments of 'finishing' during their tryst - rather unsatisfying for Rainbow, as he'd left her pleasure incomplete right as she was approaching her peak. Rainbow couldn't complain too much, as she'd taken a stallion's body for a spin last year for the first time and ended up doing the same to somepony who looked like Octavia - who was also less than thrilled. She'd never known how bad it could be for stallions when they finish, but surely somepony around would be fit to finish the job tonight.

Quietly, Rainbow returned her room key to the Mâché Mansion's concierge and made her way to the front door. Her tail flicked and twitched, this year's late-spring estrus hitting Rarity's needy body quite badly. She'd be okay with a mare to wrap up the night - the mare at the concierge desk was pretty cute. But she really needed another dick. Hopefully, she'd find another stallion to sate her lusts before the potion wore off.

Fortunately, there was no pregnancy risk with these parties. The magic involved in the body swap made sure all of the stallions were rendered infertile for the duration, which was a blessing for those mares laden with the burdens of a raging heat - a day or two of relief from the physical neediness at the height of breeding season made it much more bearable.

Rainbow stepped out onto Pear Street. Several notable Ponyville venues were constructed from bizarre materials, and the Mâché Mansion was no exception. Constructed entirely of papier-mâché, it was a rather ugly building that stood out like a sore thumb among the others here - and was well-known for its 'clientele'. And not in a good way. Any other night, and Rainbow wouldn't have set foot in the place. Nor would her host. Rainbow beat a hasty retreat, hoping to salvage some semblance of Rarity's reputation.

She'd chosen the Mansion for her little liaison because it was one of the closest venues to Sweet Apple Acres, which worked wonders for Rarity's rather dainty hooves. Being trapped in a unicorn's body meant no flying for the night, and Rainbow had only mastered the barest of levitation spells, aided largely by Rarity's instinctive muscle memory and the faint memory of that other time a couple years ago - the last time Rainbow had found herself as a unicorn. There was no chance she'd be able to teleport, even if she tried.

End result? Walking. Rainbow hated walking - the sky was her world. Fortunately, her legs were unhindered. While Rarity's mane was never ignored, Rarity refused to dress up for this particular event after one of her favorite dresses was destroyed by a careless pony who had her body the first time she participated. It had been bad. Rainbow wasn't one to kink shame, but Rarity was.

The party had developed some unspoken rules over the years. It was expected that anypony wanting to go for a 'round two' would come back to the farm and pair off again, but the number of stallions would fade off much quicker than the mares, thanks to refractory periods and stallions generally wearing out faster. This made it a great option for a bisexual mare like Rainbow - if the stallions were out of stock, there would be plenty left to browse.

Sweet Apple Acres' barn came into view fairly swiftly. Out in front was a spread of tables and food that had been fit for an Apple family reunion before the first round of hungry ponies had descended upon it. Off to one side was a dance floor, dotted with a few ponies swaying to the beat of music Rainbow didn't care for. And on the other side, a bar where Granny Smith served up the signature Apple Family Cider on tap - alcoholic, of course, to lower the inhibitions even further.

About a dozen ponies - mostly mares - were seated at various tables. Some were eating, most were chatting, and all of the stallions present seemed to have mares hanging on them already.

Rainbow frowned as she approached, internally weighing if she wanted to wait and see what stallions might arrive yet, or if she should just sate her urges quickly and try to chat up one of the mares. She had an advantage in the stallion department, as there was no shortage of stallions interested in taking Rarity's beautiful body for a test run, but Rainbow herself was also notoriously impatient.

But before she could reach the veritable smorgasbord of sexual desserts in front of her, a quick flash of rainbow color caught her eye. A rainbow that was very familiar. Somepony was in her body nearby. And a morbid curiosity set in: what was he or she doing with it? Would she be walking funny in the morning, too?

Rainbow initially thought to try and be stealthy as she snuck around the back side of the barn to spy, but almost immediately gave up that idea as Rarity's near-white coat stood out against absolutely everything, even in the dimming light. She opted instead to just walk past nonchalantly and pretend like she was going somewhere. The sounds of sex grew more and more audible as she approached, the obvious sound of her own voice crying in ecstasy luring her further forward as stray strands of rainbow-patterned tail sticking out just past the end of the barn rocked back and forth, attached to her body just out of view.

Rainbow paused. Had somepony cropped her tail?! That was a ridiculous violation of her autonomy!

But... no. That didn't make any sense, Rainbow realized. The tail moving in front of her was clearly moving as a stallion would. It wasn't her tail. And three steps later, she stopped and stared as her father's cutie mark came into view.

She was watching a pony in her father's body wreck some poor mare.

And yet, the sound of her own voice haunted her.

A few more steps forward confirmed her suspicions. The body of her father, Bow Hothoof, was balls-deep in her own cunt, hammering away with abandon.

Thousands of thoughts flooded Rainbow's mind all at once.

Why are you staring at your dad's dick?

Why are you staring at your own cunt getting plowed?

Why is my dad here?

I wonder if that feels as great as it sounds?

Sisters Above, that dick is huge.

Wow, that's a lot of squirting. That must feel amazing.

Why am I watching my dad fuck myself?

She stared in silent awe as her father's cock thrust in and out of her own abused pussy, harder, faster, and stronger than anything she'd ever seen or felt personally.

Meanwhile, whoever was in her body was having the time of her life, thrusting back against him erratically, moaning for more, gushing copious femmecum all over her father's legs, and begging to be filled with his seed. Rainbow had always been a squirter, and there was evidence of it everywhere.

It was wrong for this to happen. It was wrong to be watching this. But it was... really... really hot.

Her father's head turned, and it was obvious she'd been caught staring. He simply smiled and winked, mouthing something to her that she couldn't ascertain with his violent thrusting motions. If she'd been horny before, watching this debaucherous liaison had thrown her hormones up to heights the Wonderbolts only wished they could reach.

"Sorry!" Rainbow squeaked out in Rarity's dulcet tones, turning tail and cantering away as quickly as she could. Her heart thundered in her chest, and she could feel her marehood absolutely dripping with desire. Rainbow beelined straight for Granny Smith's bar.

She really needed a stiff dick. Or drink.

... Okay, both. But one step at a time.

"Four ciders, please," Rainbow begged.

Granny Smith's old, frail body moved slowly as she reached out for a mug and began filling it. "Four ciders, dear? Let's start with one, and see where the evening takes you, hm? You young'uns always think you can drink more'n ya can."

"Yeah, whatever," Rainbow repeated, sounding very much not like Rarity, in spite of her voice. "Just gimme a drink. And hurry."

"Hmmm..." Granny said, slowly. "What's the rush? The night is still relatively as young, though perhaps not as young as a lovely filly like yourself."

"I made the mistake of spying on somepony and I saw something I wish I hadn't."

"Oh?" the old mare replied, setting Rainbow's drink on the bar. Rainbow drained the mug in a single, massive swill, setting the mug back on the table. That confounded itchiness in her nethers would only be compounded by the presence of alcohol, but she would have to make due.

"Pray tell, what did you see?" Granny pressed, filling a second mug.

"Just an experience I don’t want to remember in the morning," Rainbow groused, already working on the second drink. "And I'm hoping if I drink enough, I won't."

Granny hummed thoughtfully. "From the way I've seen you trotting around for the last few minutes, I'd wager that you've already had an experience that will leave Rarity walking funny for a few days."

"No offense, Granny, I love your parties, but you're like, the last pony I want to talk about my sex life with."

"Oh, I hear all the details from everypony else anyway, but if you're not comfortable with it, we don't have to discuss it. I am curious, though, who you saw? How big was he? I still have an eye for a good stallion, y'know. Not that my body can keep up, mind you, but the eye candy sure is nice..."

Rainbow sighed in defeat. This old bat never would let anything drop, and given her growing senility, Rainbow didn't want Rarity to be plagued with the questions later. "It was m—" my dad? Don't say dad. "Uhh... Bow Hothoof’s dick."

Granny Smith's hooves dropped to the table. "Bow Hothoof?" she repeated in her dry, cracked voice. "Bow Hothoof?" Granny ducked under the table, suddenly much more animated than Rainbow had seen since the Flim Flam Brothers had sold her on that stupid tonic. "Oh, no, no, no," Granny muttered, slowly tottering her way across the dining area. Rainbow skipped forward quickly, trying to catch up to Granny's sudden departure. "Where d'ya see them, miss?" Granny inquired. "I need to stop 'im."

"Stop what?" Rainbow wondered aloud.

"Oh, don't you worry 'bout that none, miss. I'll deal with that. But I need to know where."

"Uh... alright," Rainbow gestured down the side of the barn. "They're just over there, around the corner of the barn."

"Thank ya kindly," Granny said, still moving far faster than Rainbow had seen in years. She struggled to keep up on Rarity’s less-than-athletic legs, and was still levitating her third drink. The alcohol was starting to have an impact, too. Everything was confusing. This was happening so fast, Rainbow wasn't even sure what was going on anymore.

Just around the corner, Granny stopped dead in her tracks, staring wide-eyed at what was going on. Rainbow came up behind her and gaped - her father was still balls deep inside her own pussy, cum dripping on the ground beneath them, and he was still pounding away.

"Goddess, yes, Big Blue, fill me up more," came the sound of her own voice.

Granny grabbed Rainbow by the mane and dragged her back around the side of the barn. "Darn it!" she muttered under her breath, seemingly losing her accent entirely. "I can't stop them. I can't."

"What?" Rainbow asked, confused. "Why not?"

"This is very bad right now," Granny croaked out. "Please talk to Princess Twilight first thing tomorrow; tell her everything that just happened. She'll know what to do."

"Uh... why can't I talk to her now?" Rainbow asked, still not understanding what the issue was.

Granny gestured around her. "Because nopony knows who she even is right now. Now, I need you to promise me something, miss. Promise me that you'll go see Twilight tomorrow!" Granny seemed to be angry, like a subdued rage boiled just under the surface of that request.

"O-okay," Rainbow said, stepping back under the intensity of Granny's tone.