Toil and Trouble

by Gassipons

Rating: mature
Tags: My Little Pony: Friendship is Magic, Rainbow Dash, Thriller, Porn, Fetish, Rarity, Profanity, Pinkie Pie, Sex, Twilight Sparkle, Applejack
Length: 10194

An ancient magic causes one fateful Nightmare Night to descend into hedonistic, gassy chaos.

Nightmare Night has arrived in Ponyville yet again, and the Mane Six couldn't be happier. With an evening of partying at Applejack's barn ahead of them, they don't expect a single thing to go wrong. That is until some stormy weather from outside locks them in, and to make matters worse another kind of storm altogether is brewing inside. Will the six resilient friends fight back against an ancient brand of pungent magic, or give in to their building, and frankly rather disgusting, desires?

--

Happy Halloween! Was in the mood for writing something a little less focused on plot and a little more focused on plot. A lot of lewd, gassy mares in this one so Hope you all enjoy it!
Fetishes: Lots of Farts, Facesitting, Cunnilingus, Cum, Orgies, Sweat, Masturbation, Butt smothering, Hypnosis/Mind control, Mind Alteration, Magically-Enhanced gas, Female Frotting

Published 2020-10-25 18:00:01 UTC
Last updated 2020-10-25 18:00:01 UTC

Bubble, Bubble

The Everfree forest was a dangerous place. Anypony could tell you that.
It was no place to be exploring after dark, and CERTAINLY not on this eve in particular...

Nightmare Night had once again descended upon Ponyville, and the town had been thrust into the seasonal spirit. Even with Nightmare Moon's redemption, the holiday proceeded as it always had.
Decorations lined the streets, and in the center of town stalls were erected to sell candies, sweets, and even offer carnival games to the costumed citizens. It seemed that every street corner had a jack-o-lantern, each one carved up with either a menacing face or an amusing one.
It wasn't just the foals who dressed up for Nightmare Night. Even Granny Smith hobbled around in her hoof-made Timberwolf costume (though only at the insistence of Apple Bloom and her friends).

But what these ponies did not know was that a loathsome magic had been unleashed onto their unwitting town, and upon six ponies in particular.
A kind of evil enchantment that should have remained rooted deep in the earth, where it belonged...

--

Settled leaves crunched underhoof as the gang made their way up towards the barn. Even from outside they could see smoky purple light drifting through the windows.
The orchard rose around them as they went. At night, and on this night in particular, Sweet Apple Acres could really be an unsettling place.
Every dead branch clattering in the wind had the potential to be the mangled hand of a horrifying monster, and every hoot of an owl or snort of a pig its ghostly call.

Everypony was unnerved, even Rainbow Dash (though she refused to show it outwardly). All except for Twilight, who rather enjoyed the creepy atmosphere of it all.
Fall had always been her favorite season, and Nightmare Night was the centerpiece. The twinkling plum-purple sky was just as beautiful to her as the smell of damp leaves and fire smoke. The taste of Pinkie's pumpkin pies and cinnamon rolls still warmed her throat, filling just about every one of her senses with autumnal delight.

"This had better be worth it, Applejack, making us trek through all these dirty leaves and all this... eugh... icky mud."

"That's if it even IS mud..." Applejack teased, "Think I saw the cows grazin' round these parts this afternoon..."

Rarity hurried her steps, she wished she had chosen an outfit that better shielded her sensitive hooves. She wasn't going to sacrifice her pony pedicure to a bit of wet mud.

"You really worked all day decorating the barn?" Twilight asked, distracted by a stray yellow leaf twirling through the air.

"Yes, m'aam! Course I had a little help from Big Mac and Apple Bloom, but I think y'all are gonna really get a kick outta it!"

"You've got food, right? Cos it won't be a Nightmare Night without lots of candy! But if you didn't, don't worry, Applejack, I got your back! I whipped up some extra cupcakes and brought them along just in case!"

"Huh? I don't see any cupcakes."

"Oh, they're in my mane for safe keeping!" Pinkie shook one out into her hoof, all covered in clumps of cotton candy hair, and munched it up with a giggle.

The air was thick with wet mud and earthiness towards the barn. A howling wind shook through all the branches in the orchards behind them, forging a rather eerie atmosphere that, to Twilight, was just perfect.

Now partly illuminated by the unnatural jello-green light seeping from the barn, the six ponies' costumes were clearly seen, and any passerby could tell that they had really outdone themselves this year.

Rarity had been kind enough to stitch together her friends' outfits in just under a week, a task that had required many cups of coffee and just as many sleepless nights.
Twilight, leading the pack, wore a witchy outfit that consisted of a tall crooked-over purple hat, a dark flowing robe (Twilight had provided illustrations from some of her favorite spooky books as reference) and long, form-fitting orange-and-black striped socks. The socks were a suggestion from Rarity, who insisted that wearing them would pull the whole ensemble together and make it quite fetching. It was certainly fetching, but not in the way Twilight had hoped. Ponies couldn't stop staring at her slender sock-filling legs when she walked through town, some even throwing a few lecherous wolf whistles her way.
Idling up above the rest of the group, Rainbow Dash wore a traditional pegasus commander uniform. The armored plates were a little heavy, sure, but she looked awesome in them.
Pinkie was bouncing around in her jester's outfit. A floppy fool's cap jingled away on her head, and around her neck was a slightly constricting collar. She would have her three devil sticks with her, had she not accidentally juggled them right through Cranky's bedroom window on the walk over.
Rarity had decided to pay homage to Celestia with a very commending recreation of her image. The princess' regalia looked quite dashing on her, she thought, and the long, glittery tail and mane matched her coat rather nicely.
Fluttershy hadn't asked for much. She didn't want to put Rarity out, and refused to accept anything more complicated than the white bunny ears that were attached to her head. Her tail, tied up into a bun, completed a very scarce resemblance to a rabbit. Or... at the very least a pony poorly masquerading as one.
Applejack had been not only modest in her request, she had refused a costume altogether. Humility perhaps clouding her judgment, the farmpony had searched out her Lion costume from last year's hootenanny and was wearing it, tatters and all.

"Alright, y'all, here we are! I sure as sugar hope y'all like it!"

With this, she nosed her way through the barn doors, revealing the interior to her friends, who one by one gasped in awe at the sight.

Not a single inch had been spared. On one end, a long table was cluttered with snacks of various kinds. Among them were bowl of punch, some cookies, cinnamon apple strudels, plenty of candy apples and some potato chips shaped like ghosts with a big bowl of spooky salsa for dipping.
Seasonal decorations hung from every wall; long painted murals of ghouls and monsters, wooden pony skulls and lit pumpkins. Some wooden effigies of Nightmare Moon were deployed in each corner, mostly worn from age. There was also a large tub filled with apples to bob, a patch cleared away in the hay for dancing, and even a 'pin the buttocks on the Nightmare Moon' ready to go.

The entire room was bathed in purple and green lighting, and two dry ice machines were pumping away, adding a nice smoky atmosphere to it all. Rarity scoffed at the them as she trotted past, they were goingto frizz up the mane she had spent all afternoon washing and styling. The things she did for these friends of hers...

"Wowzers, AJ! You really outdid-done-do'd yourself this year! This place is so cool! I mean, look at all the spooky skeletons, and the little tombstones on the walls! Feels like I'm right smack in the middle of some ookie creepy horror story! Hehe! Better hope there isn't some monster lurking in the shadows! Like that one time I went hunting for berries in Whitetail Woods and this scratchy bramble bush started shaking at my hooves, I totally thought it was a little prickly bramble monster! Boy was I scared!"

"Pinkie Pie..." Rainbow Dash lowered to her hooves, "No offence, but do you ever stop talking?"

"Hm. I guess I do when I'm sleeping, but Mr and Mrs Cake say I talk in my sleep, so maybe not! Oh! Oh! And when I'm eating some fudge that's reallly thick and chewy, and it's blocking my mouth so the words can't get out. Oh and the times when Soarin doesn't have enough bits to pay for his cherry pies so I-"

"Alright. Alright. I'm sorry I asked..."

"Applejack, wasn't all this expensive?" Drifting about the barn, Twilight examined the minutiae of Applejack's decorations.

"Naw, didn't cost me a dime! See, we apples have always liked throwin' hoedowns come Nightmare Night, so most'a these doo dads we jus' got down from the attic. Picked a few pumpkins from the patch we got out yonder, painted up all these here murals on the wall with some glow in the dark paint and there you have it! Scary or what?"

Rarity, meanwhile, was finding the decor inside to be almost as unnerving as all the mud outside. She shivered as she passed by a thick cobweb filled with little plastic spiders.
"Those ARE decorative, I hope?"

"Oh, nah! We jus' gathered those cobwebs from the attic when we brought down the supplies. Who knows? There might still be a REAL spider nestlin' in one of them." She teased, holding back a delightful snicker.

Rarity jumped away to a corner of the barn that had the least webs, but was instead surrounded by painted green and orange lanterns painted up with monster faces. If Applejack's intentions had been to make her feel unsettled, she was successful. The night had only just begun and already she'd been frightened more times than she was comfortable with.

"Sweet venue, AJ! But my tummy's calling out for grub and I see a toffee apple with my name on it!"

"That's funny!" Pinkie snorted, trotting alongside Rainbow, "Cos I see five my name on them!"

They dug in, guzzling the rich festive sweets like it was the first meal they'd eaten all day, and while they were taking their fill, the rest of the group started to relax into the holiday spirit too. Applejack cranked up an old gramophone, and soon there came the sound of drums underneath a wailing, melodious Theremin.

Outside, deep in the orchard, something was lurking. The trees rattled with a little more vigor, and the air blew several degrees colder. This presence, dark and baleful, approached the farm, steering towards the barn.

"Waitwaitwait!" Pinkie perked up.

"What's wrong?"

"It's my tail! It's a-twitching! My Pinkie sense is trying to warn me about something! Oooh, whatever it is, it's a doozy alright! A real humdinger!"

"Oh, Celestia above!" Applejack leapt under the nearest table, cautiously scanning the ceiling for any cans of paint or flower pots that could fall.

The room fell into silence, everypony glared at Pinkie as her tail flickered away.
Soon, her body was bouncing up and down with the same ferocity. The danger was looming closer. Her tail inched higher and higher until...

pffrrooot

"Eheh... sorry, girls. False alarm. I think that was my stinkie sense acting up after all! Heehee!"

"How charming." Rarity scoffed, at least she didn't have to worry about the sky falling on her head.

The party resumed, the music picking up into a nice organ-lead shuffle. Pinkie and Twilight showed off their limited dancing abilities on the floor, Twilight almost wobbling her way right into the punch bowl. She blamed the costume.

Loaded up with spooky snacks, caught up in the excitement of the party, the group didn't imagine anything could happen to dampen the enjoyment of their evening. Everything was charging along quite nicely, just as Applejack had planned. Later on they would huddle around to tell ghost stories, Twilight had brought with her a heap of old books she was sure would elicit a scream or two. But, of course, just when all of them didn't think anything could go wrong, it did.

The wind picked up speed outside, hammering against the walls of the barn as it bellowed through the distant trees.
Violent gusts lashed through the open door, sending a frigid breeze into the barn which rattled the various decorations and extinguished all of the jack-o-lanterns. The jolt of cold air shocked a wet fart out of Pinkie, who started shivering with a clatter of her teeth.
Rarity was about to ask that somepony close the door, but before she had the chance a particularly spiteful wind swept forth and slammed it shut with a BANG, jamming the outside lock.

Everypony froze on the spot. They blinked at few times. That little metallic ker-PUNK didn't sound too promising to Applejack, who cautiously went to the door to check it, hoping that her suspicions were incorrect.

"Uh oh."

"Uh oh?" Twilight asked, "Is that a bad uh oh or a good one?"

"I think... the door might be... uh, locked."

"Locked!? Hey, I'll kick it down!" Rainbow Dash started speeding towards it at full pelt, but Applejack gnashed her teeth out to grab the hasty pony by the tail before she could get far, pulling a ripe fart from beneath it.
"Hey!"

"Oh no you don't! You know how much this door cost to reinforce? You really wanna pay for a new one?"

"Fine, fine, but we're keeping that as a last resort."

"I don't know if I can cope! I'm hyperventilating! You know I have a crippling fear of small spaces, don't you? My mane! The humidity!" Rarity panted, fanning herself down with one of the rubber bats.

"Now, don't go gettin' a burr in your britches, Rarity. We'll be just fine."

Applejack returned to the door for some more investigation. There was a slight chink between it and the surrounding frame, and when she pushed her eye right up to it, she was able to see out into the yard.
The back porch was unlit, sadly, but if luck was on her side, then in just under half an hour Big Macintosh would head out to drop the trash into the outside can. If she could somehow, with a holler or a yelp, catch his attention at just the right moment, then perhaps they would all be saved.

Food was no concern. They had more than enough to keep the entire group going well into the night, but on top of Rarity's freaking out and Fluttershy's discomfort, Applejack was starting to feel something tangling up in her stomach. She either had to fart, or drop some dung. She wasn't sure which it was, but either way it spelled trouble.

"How about I try my magic?" Twilight inspected the door alongside her friend.

"I appreciate the offer, Twi, but after that time you volunteered to help with the barn raise last summer..." Applejack could still recall the smell of burning lumber.

"Oh, that was a miscalculation on my part! It won't happen again! Maybe..." She silently relented as she retreated back to the dance floor.

"I still say we kick that thing to pieces. I'll pay for a new one!"

"Rainbow Dash! You couldn't even pay for your Hors d'oeuvres when I took you out to lunch last week!"

"By principle I don't pay for stuff I can't even pronounce."

"Well, perhaps you should, then you could finally start using some eau de toilette..." Rarity venomously mumbled under her breath.

"If we jus' stand around arguin' we ain't gonna get nowhere! Now, I'm sure it'll all be fine, let's just forget about it and try to have fun."

"Excuse me." Pinkie said suddenly with a bit of strain in her voice.

"Excuse you? For what?" Twilight probed, shuffling closer to the pink pony.

Suddenly, a smell hit everyone. A nasty, sour stench that could only have come from one place.

"Eww! Pinkie Pie!" Rainbow Dash was in hysterics, "Silent but deadly! Sick!"

"Ewww!!" The others all screamed in unison, half of them amused and the other half absolutely revolted.

"What? I said excuse me!" Pinkie grinned with a quick flash of her tongue.

"It's bad enough we're stuck in here, now we have to be trapped with THAT!"

"Ahh. Excuse me too." Rainbow Dash snickered mischievously, sailing overhead. Her friends found out far too late that she was in fact silently crop dusting them from above, and the eggy stench hit them all at the same time. Their chorus of disgust was music to her ears.
"Sorry girls! It's all that candy getting to me!"

"Candy isn't supposed to smell like THAT!" Rarity said as she shuddered with every resentful sniff.

"Dang, RD, that's a bad one!" Applejack had resorted to wafting her hat around. Truthfully, she found flatulence just as funny as Rainbow Dash, but she preferred to keep up a brittle air of manners around her friends.

"If you wanna blame anypony, blame Pinkie Pie! I was gonna hold it in but I just couldn't leave her all embarrassed by herself. A friend never leaves a friend hanging. Speaking of, Rarity, can you pull my hoof? This next one's kinda stuck up in there."

"Absolutely not!"

frrt

"Rainbow Dash!"

"Hey, that wasn't me! That one was WAY too puny to be one of mine."

The fart actually came from Twilight, who was sweeping her silken tail left and right in a vein effort to dilute the smell. She held her hoof up to her deeply blushing face, hiding one side of her bashful grin.

"Uh, Applejack, are you sure you didn't put s-something else in that punch?"

"Somethin' like what?"

"Like, a laxative...? It's just... so bizarre! My body keeps producing..."
Frrppplt
"...gas, and I haven't even eaten any fibrous foods today! It's uncanny!"

"Have you not entertained the possibility that these lot are simply rubbing off on you, Twilight? After all, I couldn't help but notice your less-than-stellar eating habits at that snack table."

"No, Rarity! I just have this weird... tingle in my belly!"

"Yeah, sugar, that's called havin' a little gas, and believe you me there's only one way to fix it!"

"No! No! It's almost like... m-magic or something!"

"Sheesh, I'll say! That smells like the bottom of a deep fat fryer, Twilight!" Rainbow Dash laughed.

Pinkie's head surfaced from the depths of the lucky dip to join the conversation.
"Magic? Hey, do you think this might have something to do with that spooky book of curses and enchantments I found in the Everfree forest?"

"The what?"

"Yeah! Yesterday I was trying to track down some creepy trinkets to bring along to Applejack's Nightmare Night party, and I figured the best place to look would be the Everfree forest! So I grabbed my saddlebag, my favorite joke book in case I got spooked, and bounced my way deep, deep into the forest! Y'know, where the trees get all... OooOoOoh! and the brambles and roots get all tangly and knotty and triperific! And I fell and tumbled down this reeeeally steep hill, which was kinda fun! Then I ended up in this really dark cave, and that wasn't so fun! And it smelled kinda like mould and old water and moss, but I kept going because I'm no scaredy puss! Eventually, I found this weird room that looked like it had been left alone for hundreds of years! There were all these old ugly statues covered in cobwebs, and some kinda altar, and on this podium was an old dusty book! So I picked it up and read some of it, but it was super boring! I couldn't even understand it! So, I dropped it in my saddlebag and hopped back home!"

"Oh dear. This can't be good. Not at all. The moment we get out of this barn I'm going to have to pay a visit to Zecora... Do you still have the book? D-Do you remember what it was called?"

"Well, duh, of course I have it!" Pinkie shook a large tome out of her mane, nudging it towards Twilight who immediately examined its cover.

Her friends huddled in close, watching her curiosity fall away into disdain. "It's written in old Ponish, but some kind of strange dialect I've never encountered before... not even in the bowels of the Canterlot archives..."

"Speaking of bowels..." Rainbow Dash started, "Who just ripped that silent one? Cuz you really need some more greens in your diet."

Everypony else was soon smelling it, too. An awfully meaty, greasy stench that had engulfed the entire group within seconds.

"Gross!" Pinkie laughed.

"Ain't no way somethin' that ripe came outta a livin' thing." Applejack was actually a little jealous of whomever could produce such a powerful odor.

The girls all looked around, trying to sus out the culprit, but only one of them had remained unphased by the smell. Twilight.

"S-Sorry, girls... I just can't help i-" Interrupting her, a far more incriminating fart came thundering out out of her ass.

"Don't sweat it, Twilight. For what it's worth, I'm feelin' a little bubbled up myself."

"Me too..." Fluttershy added, a short peep issuing from under her tail. Slowly reversing into a corner of the room, she was distanced enough from her friends to freely let loose.

"It's all Pinkie's fault!" Twilight was beet red now. She tried several spells on her sphincter to find one that would seal it shut.
But not even her most specialist magic was a match for the brand of mysterious sorcery Pinkie had unwittingly unleashed onto the group.

A series of short, uncontrollable bursts popped through her cheeks, and soon the rest of them followed suit.
Farts of various tones and volumes erupted from five of the ponies, one after the other, like some kind of gaseous symphony.
Rarity, however, had somehow evaded the grasp of the spell. She still possessed her faculties and was condemning the behaviour of her friends.

"Oh, I cannot believe you! All of you! Breaking wind willy nilly like a pack of schoolfoals! I mean, Rainbow Dash and Applejack shouldn't surprise me, but you, Twilight? Where's that cultivated Canterlot air?"

FRRRPPPT

"There's your Canterlot air, Rarity!" Rainbow Dash fell over laughing.

Twilight's back knees bumped together as she lost control and tooted over and over again, panting and moaning from such a powerful release. Her farts were loud and full, commanding a lot of attention. She usually only farted when she was by herself, reading a nice long book with a cup of fragrant tea. But this was different. Everypony could hear, and smell, her expulsions. At first, it was devastating, but with every passing rump-trumpet, it didn't seem to be such a big deal. After a few more minutes of fog billowing out of her ass, she actually felt rather comfortable.
She knew, of course, that this was simply an effect of the magic. Like a drug, it enhanced her senses so that every fart was just a little bit hotter, a little bit wetter, and a little bit stinkier. She could really focus in on the beauty of it all. The way her hole quivered and rumbled, the pleasant warmth passing through her cheeks, the alleviation in her belly after every release. It was wonderful, really. She didn't understand how she had never noticed it before, but there it was. And suddenly, all of those concerns about Pinkie's magical mishap; about the profane spell cast upon them all, and even about unlatching the door and escaping the barn, just snapped away. In their stead was a desire to simply let loose and enjoy every second of it.

Her friends underwent very similar transformations. The dark, demonic magic buried into all of their minds, altering their thoughts, and it didn't stop there. It was taking effect on their digestion, too. Tweaking a few things here and a few things there so that the little ponies were quickly burgeoning into massive, bottomless gas bags. This alteration barely manifested itself physically aside from a slight swell in their bellies and a little swirl of inner turmoil. All of them were farting up a hazy storm of stench. Rainbow Dash had already been cutting farts for some time, so for her all this spell did was give her more ammunition to play with. She flittered about the barn, laying warm farts into her friends' faces before zipping away in a fit of giggles. Her farts were quick, sharp, and her suit of armor gave them a nice metallic, almost percussive ring.
Applejack, likewise, was no stranger to letting a few bombs loose. She was revelling in her enchanted innards, squinting her eye and biting her lip to force out some of the loudest booming farts her friends had ever heard from her. They sure didn't smell like apples, more like a gross amalgamation of granny's stew and hot, ripe manure.
Pinkie Pie was hopping around and letting farts fly between her cheeks like little firecrackers. Flatulence was already just about the funniest thing in Equestria to her, and with the spell influencing her thoughts they were twice as humorous. She shifted her cheeks into an array of positions in an attempt to change the sound of the gas escaping her. If she leaned to the left they came out sounding like strangled baby elephants, and to the right more like wet bloated toads.
Fluttershy had been releasing not a chain of farts, but one long, howling, silent one. It had been going on and on for what had to be thirty seconds. She was away from the group, so fortunately they weren't able to smell it, but she certainly could.
Her tail raised as she hissed out this record-breaking breeze, lowering softly when she thought it was coming to an end but promptly hiking back up for another five or ten seconds.

Rarity was quite appalled by the display, but even with her sneering face and her hoof flapping around to ward off the fetid aroma, she couldn't deny that her belly was starting to churn up something too.

If she didn’t relieve some pressure soon she would burst.

And so, feeling slightly defeated, Rarity lifted her leg just slightly and struck a rather elegant pose, as her etiquette teacher had taught many years ago. She looked like she was ready to mount the catwalk rather than ready to pass some gas.

Waiting for the pressure to burble down to her flanks, she gave a little ladylike push and eased out a warm, silent plume of sulfur. A short sigh of relief left her lips as it inaudibly vibrated through her puffy ponut. Rarity was the queen of the silent but deadly, after all.

There. Noting to it! Confident in her abilities to pass wind undetected, she bit her lower lip, flexed her stomach gently, and...

FPPT

Rarity’s face turned wine-red. She pleaded to Celestia that her friends hadn’t heard that. That their own sputtering backsides were enough to mask her embarrassing release.

But the princess was busy with her own gaseous endeavours that night, it seemed. Her pleas went unanswered.

“Hey, nice fart, Rarity!”

In the space of five seconds, Pinkie had somehow teleported behind the flustered unicorn. The sudden surprise ripped another short, embarrassingly noisy toot from her supple ass. Her tail snapped down over her privates to try and stem the smell. But yet again her efforts to suppress her eruption went unsuccessful.

“Ooh, stinky! Try THIS one on for size!”

Before Rarity could protest she felt Pinkie’s plentiful plot bump up against her own. It reeled back for a moment, and then collided with her ass again, twice as hard, shunting her whole body forward.

Her friend’s fat flanks squashed into a pink pancake of flesh, squishing the two rumps together into one meaty sandwich, and all sandwiches need a filling! A muffled Pinkie fart bubbled up through Rarity’s bottom in a sour rush, making her cringe.
It was just so... excruciatingly warm... such a perverse invasion of her privacy! How any of her so-called friends could act like such brutish pigs was beyond her.

Pinkie grunted out a second fart, giggling at the muffled sound, popping a few more deep, muffled bombs into Rarity's crack. She having more fun with this than a mare at her age should.

Rarity felt each individual bubble of air leaving Pinkie’s tight hole and bursting against her own, one of the stink pockets actually got trapped between their conjoined mare mounds, and Pinkie had to wriggle her cheeks a bit to pop it.

The stink of the bubbly party pony’s innards washed over Rarity, and her friends could see her turning green in the face.

“Pinkie, do you MIND?”

“Me? Of course not! Feel free to let ‘er rip as much as you want! This toot sandwich of ours is feeling a little one-sided, after all!”

Rarity turned her weary face to Twilight, hoping she might try to break it up, but the unicorn was far too amused by the whole thing, aroused even. The rest of her friends watched on without intervention, and just when she thought she might be able to forget about it Pinkie Pie would send a flurry of ass gas barrelling into their united flanks.

Pinkie sniffed the ripened air, pressing her hoof up against her snout when she realized how putrid her own farts were. She often had stinky ones, Mr and Mrs Cake could attest to that, but something about these ones was twice as nose-scorching as her usual output.

“Smells fresh as a daisy in here, eh, Rarity? I oughta lay off the flapjacks, those oats really do a number on me!” Pinkie punctuated this with a loud honk. It blew directly into Rarity’s lady parts with a gulp, deep into her intimate folds.

Rarity wanted to denounce the childish behaviour some more, but she was in the midst of her own psychological turmoil.
Something about this situation didn't only seem acceptable to her, it actually seemed rather... nice. It was just a little gas, after all. Why did it have to be such a big deal? Everypony did it. She certainly did it a few dozen times every day. Why hide it away? She asked herself these questions and quickly realized that she could not produce the answer. It was strange. It were as if something had just clicked in her head.
What Rarity didn't realize was this was no change of heart, but a literal change in her inner mentality. Even though she tried to fight the influence of the spell, her mind had finally relinquished to it. Her lady parts were already fluttering a bit at the sheer prospect of all this gaseous filth.

Adrift in her changing thoughts, Rarity had momentarily forgotten that Pinkie was still squeezing their rumps together like a pair of passionate lips, and even now it didn't seem all that important to her. What seemed important was getting rid of the sharp gastric pangs which had worsened within the last few seconds.
There was only one way to go about doing that, something that her etiquette teacher had repeatedly advised against doing. She tensed her stomach with a sharp, feminine grunt and released.

Rarity's fart was loud enough to shut her friends up. Even though it was partly quieted in Pinkie's parted balloons, the rattling rumble almost shook the rafters.

"Ohh, goodness!" She sighed blissfully, relief melting into her flushed features as she spewed out another long, buzzing chainsaw fart into Pinkie's crack.

"Wow, good one, Rarity!"

The smell cooked into the air around Rarity; a particularly pungent blend of cabbage and wine that managed to permeate through Pinkie's milky flatus.
She huffed and huffed, at first curious but then eager. It was deliciously fragrant, steamy and fortified with what she recognized as Prench mustard from her lunch's salad dressing. Rarity blasted another vulgar fart through Pinkie's cleft, and in turn Pinkie returned fire with her own bubbling rip. The ponies farted in discordant harmony, churning up an obnoxious blend of digested party food and fermented haute cuisine. Their marehoods both grew moist from inhaling their combined stench, and soon the pair were pounding their spongy wet mounds together as well as their wide ass cheeks. Both Pinkie and Rarity were certainly well-endowed in that department. Cookie Crumble's hefty cookie crumblers had been passed down to her daughter, and while Pinkie's mom was about as portly as the rockfaces she farmed, a lifetime of indulgent parties and a steady diet of candy and cake had given Pinkie quite the seat-squasher of her own. Rarity was the first to cum, trilling out a cry of sexual relief as she squirted her thick feminine sauce into Pinkie's pink. Pinkie whooped and giggled as she exploded back, and her orgasm really was explosive. It fired from her cunt like a party popper, she tilted her hips upwards so that the second sputtering spurt went all the way up Rarity's crack.

"Wheee! That was fun, Rarity! Let's do it again!" Pinkie cheered, already getting back into grinding her plump pony vag into her friend.
"Boy, do we stink! Kinda smells like an orgy at a baked bean factory!"

Almost on cue, both mares released another round of sloppy flatulence, made wetter by the presence of goopy mare cum gluing their rumps together. A fresh wave of fumes reached Rarity's nostrils, she could really smell the cabbage now.
And, not ten seconds of butt-crushing later, the two friends came hard into each other yet again.

They pulled their rumps asunder, their collected loads stringing together like melted mozzarella. With a gap now opened up between the two flatulent butts, Twilight Sparkle burst forth and wedged her head between them.
Rarity and Pinkie were surprised at first, but certainly not deterred.

"Woop! Now our sandwich really does have a filling!"

They both reared up in perfect synch, paused for a second, then bashed their asses into either side of Twilight's head. Her cheeks squished up in the smelly mare sandwich, her lips forced to pucker as the two ponies began to rock back and forth in a sensual grinding motion. All of the cum and sweat produced a deep sloshing, squelching sound as they crushed Twilight's head in the middle.
It wasn't long before the farts started to flow again, one side of Twilight's face rippled with Pinkie's dairy fumes, and a few seconds later a deep buffeting cabbage stink came from Rarity's side. She was in heaven, taking deep sniffs, feeling the air thicken and humidify on her sweaty face. Her cunt was flapping and gushing down below, all over the floor, and from a distance her friends could only see a witch hat being slowly consumed in pounds and pounds of bubbly horse ass.

"Atta girls!" Dashie cheered from the sidelines. They both stunk so badly that Rainbow Dash actually found herself fanning it away from her with her wings.

Applejack stood by her side, just as amused and enticed by the raunchy display. "Hey, Rainbow Dash. I reckon my rippers are twice as powerful as yours. Wanna put it to the test?"

Rainbow Dash was intrigued. She wore a wide, goading smile as she slowly turned to see Applejack waggling her rump, ready to go.
"I dunno. You feeling lucky, cowgirl?"

"Betcha never met a Lion that could roar from both ends, heh heh!"

Applejack didn't have to push very hard to expel some of her simmering tummyache. Her fart crept into the back of her lion suit with a low growl, smacking through her incredibly meaty flanks and gradually picking up volume as it spanned ten full seconds. It ended with a little brassy spike of pressure and a sigh from the mare.
"Ahh! Try that one on for size!" She fanned it away with her tail, deliberately sending some of her dense stink in Rainbow Dash's direction.

The wall of fermented fruit hit Dashie like a sledgehammer. All those apples had done some damage. Applejack's farts were almost as smelly as hers, and she couldn't deny that they were definitely louder. Even smothered under the material of her lion suit the earth pony's ass was determined to be heard (and smelled).
But if Rainbow Dash knew one thing about competition it was that she couldn't let her opponent think she had the upper hoof.

"We-eak!" Rainbow Dash taunted, readying her stance. Her tight butt upturned in her friend's direction, ensuring that Applejack would be downwind of this next one. A bubbly overture sounded in her guts. She had a good feeling about this one...
"I'm gonna wilt your dumb lion mane!"

"Confident! I like it! But don't go making promises your patootie can't keep!"

Having had just about enough of Applejack's boastfulness, Rainbow Dash puffed her cheeks, pushing down every last ounce of pressure she could. What came out of her was not one fart, but several, sprinkling through her clenched cheeks in little gurgling puffs. She pushed twice as hard for the last one in an attempt to match Applejack's volume. What she squeezed out was definitely loud, but not at all bassy. It sounded like a bee trapped in a jar, screeching like a car tire for five or six seconds before capping off with a wet BLART! Even the metallic amplification of her suit had done nothing.

"Cute." Applejack scoffed. This was going to be easy as apple pie. At least, that's what she thought before the smell hit her. Her shocked reaction was palpable.
"Gosh darn, Rainbow... whew! What have you been eatin', girl?"

"Oh, ya know..." The pegasus goaded, sending more of the stench towards her friend with a waft of her wings. "The usual. Spitfire's got me on a diet of eggs and broccoli for just about every meal." She cut another wet one and fanned it backwards, "It's supposed to keep my muscle mass up or something, but my stomach does NOT like vegetables. That, combined with the protein shakes I have for breakfast every morning, aaaand..." pprt "I'd say I have the stinkiest farts in all of Equestria!"

Applejack could sure smell the eggs, but not even a hint of the broccoli. As foul as her own tailwind was, it was no match for what Dashie was cooking up. She wiped the sour tears from her eyes and regained a little composure. Stankiness wasn't everything, after all. "Alright, Alright, but you just ripped three farts and I figure that means I get to take three extra turns."

"Wh- What!? No fair!"

It was time to get tactical. Applejack's best course of action would be releasing right into Dashie's stunned face, and her lion suit was preventing her from doing full damage.

The old thing was already filled with holes, so it didn't take much effort to tear a larger gap across her rump. Her wide ass crack was now visible, with her dark, sweaty nethers peeking through. The bulk of her backside caused the hole to tear wider and wider, her buttocks trying to spill out through this newly-made exit

Rainbow Dash wasn't even given a chance to stare at the exposed ass. Quick as a whip, Applejack leapt back through the air and stuffed the poor pegasus' muzzle right between her slabs. Hot, fresh sweat dripped all over her face, the bitter smell of ripe, savory appleass was nothing to sneeze at (even if the ringing sensation in her sinuses made her wish it were).
But the smell of frowsty sweat would be the least of her concerns. Dashie could hear Applejack's belly roiling up another round of anal artillery, and AJ could hear it too.

"Ooh, boy. I gotta little doggy ready to go, and his bark is just as bad as his bite!"

A loud, spluttering fart rushed out and over Dashie's face, her mane blowing back in the fluttering flow, then, as she had been promised, there came two more. Those two extra farts really made all the difference. Applejack’s flatus was already smelly from a distance. Up close, it was absolutely disastrous.

"Ouugh! Applejack, get offa me!" Rainbow Dash coughed between bouts of laugher, but the smelly earth pony was going nowhere soon.

"What's wrong? Ready to give up?"

"Ha! Not likely! These farts are still lame, not nearly as bad as m-"
A warble of wet flatulence shut the pegasus up, gusting directly into her open mouth and bleaching her tastebuds with its putrid flavor.

Rainbow Dash ripped herself out of AJ's crack, a little lightheaded from that direct attack, and after shaking her armor plates away from her ass, the contest soon resumed. It was a ferocious back and forth between both ponies, one would dish out an impressive salvo of flatus that was immediately followed up by an even better one from the opposition. Both ponies were jockeying for first place, one-upping each other no matter how loud or smelly their opponent got. They were both so invested in achieving pungent victory that Applejack didn't even notice Rarity unsticking her rump from Pinkie and skulking over to get a front row seat.

But watching wasn't enough to sate her welling desires. She flipped a coin in her head and decided on Applejack, trotting up behind the mare to get acquainted with her ass.

Rarity nestled in there to take a deep whiff of the thick apple flatus that was already trapped and condensed between her flanks, shuddered with absolute delight. In all her excitement her bright pink tongue darted out through her lips, whipping AJ's steamy cooter with a splat!

"Hoo! Damn, Rarity, Should really take me out to dinner first!" Applejack joked, shaking Rarity's face with her ass and enjoying the attention the hungry Unicorn lavished upon it. She sniffed up and down Applejack's crack, drying up all the murky swamp ass that had collected over the course of the day, even dabbing her tongue on some of the wet spots to taste that too. She wanted to be covered in filth, and bathe in Applejack's gloriously rugged flatulence all day. Earth ponies always had the raunchiest-smelling farts, the kind that really burned her nostrils and stung her eyes. How could she have overlooked it all this time? For a moment she thought about the many, many thunderous rips of AJ's that she had scoffed at or quarrelled over, and then she got to thinking about all the other bouts of flatulence she had missed out on over the years. The ones Applejack let out during the average work day. From now on she would not let another peep of gas evade her greedy nostrils. She would follow Applejack around from dawn to dusk if that's what it took to sample every last parp and poot the pony produced.
It had been at least a minute since Applejack's last release. Rarity was already desperate, she needed her fix.

"Mhhh, Applejack, daaarling~" She cooed, her hoof reaching underneath Applejack to probe at her disgruntled and fur-covered belly. "Could I have some more? Pretty please with a nasty, ripe little cherry on top?"
Her hoof went from poking at Applejack's paunchy gut to really pushing it, and this added pressure was enough to drive out a short trumpeting BRRAAT. To whiff this one up, Rarity slinked down into her crack, ensuring that she got a few good sniffs directly from her steaming hole, where it was the most pungent.
"Ohh, delicious, darling, just... heavenly!"

But the smell dispersed surprisingly quickly and she found herself yet again bereft of the apple-tainted air she so desired.

Applejack, of course, was more than willing to oblige. The strange spell was starting to take effect her too. But even if it hadn't been, the pony would be willing to share her gases. If not to make her friend happy then just to show off.

"One more hot, toasty applefart comin' right up!" AJ purred as if she were about to dish out a freshly-drawn mug of cider to a paying customer, grinding the tight musculature of her rump into Rarity's soft face while she charged this next one up. She could tell it was going to be rank, and when it spluttered out of her she was right. The ripper was loud enough to gather the attention of the rest of her friends, who watched in awe as Rarity huffed and huffed until her sinuses bruised, nosing herself between Applejack's muggy cheeks so hard her snout almost disappeared up her asshole.

Soon another fart rumbled up out of AJ's stinkhole, low and steady like an engine. Rarity's entire face trembled on the heavy vibrations. Whipping around her head, and pummelling her ears, the grizzly, growling cacophony ensured that every one of her senses was accosted by flatulence. The smell of sour manure and rotten apples prevailed in the ambience of the room for a moment, and Rainbow Dash, as always, hated being outdone.

"Hey! Quit hogging her!" She flapped over to Applejack, who was still pumping out this half-minute long storm and wearing a particularly strained expression as she did so.
"Rainbow... hnng.... Dash.... aggh... get yer own pony to fart on!"

Rarity certainly wasn't going to turn down another source of farts to sniff, so when Rainbow Dash fluttered down to the ground and smashed her haunches onto the side of Rarity's face, she merely moved her snout to the side to sample the dried sweat in the pegasus' crack.
"Mmmnh. Quite salty." The strongest smell came from her plothole itself, which clung on to some drifting traces of her previous farts. Her sniffs developed quickly into short licks, starting up at Rainbow Dash's greasy dock and then dabbing all the way down through her shimmering swamp ass. Her flat magenta tongue painted long wet trails over her cheeks, pressing down the short blue hairs of her coat under a layer of glistening slaver. The taste of sweat stuck fast to her tongue, pitching camp deep in her tastebuds, ensuring it would be remembered for perhaps weeks to come.
Rainbow's little blue ring puckered up and puffed out a short prrtp, startling Rarity for an instant. She teared up as she smelled it, just as eggy as Dash had been boasting earlier, but delectable all the same.
Applejack, not wanting to be left out of the fun, issued a much louder offering. The muddy fart rushed out of her muscled meat with the loudness of a foghorn, drawing Rarity's greedy face back into her cheeks.
"Ahhh~!"
The hot stink of horse turds and bruised apples coupled with Dash's eggy farts in her nostrils. Soon she was turning from ass to ass; the little competition between the ponies started back up and Rarity couldn't be happier.

Pinkie Pie, meanwhile, had been gorging herself on snacks and blowing trumpets every few seconds. She didn't need anypony else to have fun. Each time a toot blurted out of her she would giggle at the sound, and then shamelessly whiff up the scent. She loved her own brand; the way it was both sour and sweet at the same time, and reeked of rotting dairy and stale candies.
The more she breathed her own pollution, the more Pinkie realized that the smell wasn't just good, it was incredible. Eventually she was spouting out gas faster than her stomach could stir it up, wafting the air into her own face with a few wiggles of her bushy tail.

In all of this commotion, Twilight was feeling excluded. She had no control over her own juicy farts, they just kept coming and coming, and even when they were several seconds long they didn't do much to reduce the urgency in her belly. This was truly a strange kind of magic, and she might have taken the time to study its effects on her body if she weren't distracted by all this ass-ripping.
And, like Rarity, Twilight had a similar urge to get a closer sniff of what her friends were baking up. The air in the room smelled fantastic, the fact that everypony's gases mingled together so perfectly was surely a testament to their friendship and compatibility. But with all these fartholes sounding off nonstop, it would be a crime not to get a much closer sample.

When she saw a brief gap in activity between Applejack and Rainbow Dash, she lunged forward to claim the sporty pegasus for herself.

"Whoa!" Rainbow Dash's wings shivered at the sensation of Twilight's cold snorting sniffs all over her ass. The unicorn was getting in there deep, really digging for gassy gold.

"Careful back there, Sparkle. You're face-first in a danger zone." Dashie flipped her sweaty mane from her face and flared her wings proudly.

But Twilight just couldn't stop herself. Any rationality left her at the same time as a gentle, mewling moan.
Rainbow Dash squeaked out a constant supply of eggy toots, one every other second, a little parade of noxious stink bombs that Twilight savored like they were nibbles at a fancy party.
She alternated between pressing her muzzle into Rainbow's belching asshole and lapping her tongue between her sweaty lips. Up, down, one after the other.
God, this pegasus stunk! Every part of her reeked of sharp, tangy perspiration or nostril-burning gas. It was all the working out and flying around, she figured, paired with a slightly lackadaisical approach to showering.
Rainbow Dash caught the draft of whichever farts Twilight didn't greedily gobble up, and actually gagged on her rich sulfur deposits. This spell was progressively making her own brand even stinkier! Either that, or she really had to cut down on the raw eggs in her protein shakes.

Twilight suddenly felt her insides twisting into knots, and scrunched up her face as she eased some pressure. Warm gas curdled between her fat flanks, with a sound like soggy ripping paper. This was a wet, wet, watery fart. The kind of risky one that would ordinarily send Twily dashing for the bathroom. Her friends were thinking the same thing.

"Dang, girl!" Applejack hollered from across the room, Rarity still deep in her mounds, "Sounded like you dropped some apples there!"

"It was just gas... I think..." Twilight giggled into Rainbow Dash's ass, licking it up and down, catching a fresh spicy fart on her tongue.
"But it sure did sound wet, didn't it? Almost as wet as my hungry little pussy!"

She spun around to present her winking, bright pink slit to Rainbow Dash, who dove right in for a succulent taste. She didn't even take a second to consider it before she was muzzle-deep in wet purple flesh. Twilight mashed her fat lips against the Pegasus' face, aiding in her attempts to eat her out. Wet, meaty slaps accompanied each lap of Dashie's determined tongue.
Another bubbling fart escaped, even wetter than the first one. Twilight pushed harder and harder until the wet dribble became a loud, gulping splatter.

Rainbow Dash caught wind of it and retched. It was downright caustic, even worse than her ones had been, even worse than hers had EVER been! It stunk of rotting brown onions and greasy sweat. The stench was so pervasive and pungent that she actually had to spread Twilight's fat pillows to check the unicorn hadn't soiled herself.
As Twilight's little purple hole was revealed, a wet belching fart spat out of it, and as repulsive as it smelled, Rainbow Dash found herself filling her lungs with the aroma all the same.
Twilight was periodically hit by waves of her own stale stink and it got her even wetter and stiffer down below.
At the bottom of her luscious lips, her cherry red bean had popped out, drooling a thick stream of salty cum. Every time Rainbow Dash passed her tongue over it, Twilight moaned into her closed mouth. Pretty soon Dash caught on to just how sensitive this particular area was, and focused all of her efforts into probing and playing with Twilight's engorged bud.
A larger bubble gathered at Twilight's haunches, locked and loaded and ready to fire. Twilight gave a push and what came out of her was the raunchiest, juiciest fart she had EVER heard in her life.
None of her friends had ever heard an ass produce such a sickeningly gurgly, spluttery sound either. They actually had to pause what they were all doing to appreciate it. It sounded like Twilight was farting into a puddle of thick mud, and the smell of this one was so awful that Rainbow Dash had to sit back and take a breather.

A sharp hit of it reached Twilight and she finished there and then, arching her back as her cunt sneezed out a mist of marecum all over Rainbow Dash and the floor. Another wave followed, so intense that it sounded like she was peeing rather than cumming. This spluttery release was followed by another, this time from her asshole, which spewed out a few uncontrollably loud bursts of thick gas.
"D-Damn..." Rainbow Dash coughed some more fog out of her lungs. "Twi, I don't think you need to ride around on a broom, this ass is jet-powered!"

Dashie's hooves squeezed and massaged the round butt cheeks, heaving them around in a soft, circular motion. Twilight strained and let out a long, bubbling fart at the same time, and the resulting sound constantly undulated between muffled and crisp. Dashie started smacking those blubbery bubbles together, fast, spreading, kneading and producing a quickly oscillating noise. Pinkie Pie fell over laughing (and ripping a few farts) at the sound of it.

"Haha! H-Hahahaha! It sounds like Twilight's b-booty is trying to communicate with us!"

Rainbow Dash was lost in the lust of the moment, she didn't even take in whatever Pinkie Pie was yammering about. She took deep, painful whiffs of Twilight's eldritch mist, her humid breaths pouring out directly into the mare's velvet folds. It was by the far the most appallingly stomach-turning thing she had ever smelled. Worse than garbage, even worse than that one time the academy toilets were clogged up for a whole month.
And the unbearable nature of Twilight's sodden farts was exactly what made Dashie blow her load, all over the floor. It sprayed from her winking muff like a hose, lashing thick glistening ropes of marejizz onto the hay below her, heaping out of her for what seemed to be a whole minute, until her legs were too weak from pleasure to stand. Twilight's horrendous gas had now been responsible for two mares busting their wads, and before the night was through it would be responsible for more.

With the door still bolted shut, there was no circulation. The air in the barn was still, and thick. Thick with the dizzying stench of many, many gallons of stinking mare farts and the ripe stench of bursting sex-ridden wet cunts. It was either a repulsive smell or a heavenly one. To the girls in there however, under the influence of this bizarre spell, it was about the most amazing thing any of them had ever experienced.

Fluttershy couldn’t get enough of it. She was off in the corner, and had been pushing out soft and silent farts for the best part of the evening. She was getting off on the stench of her own magically-hoodoo'ed guts. It was a good thing that she was away from the rest of the group, because what she was dealing was truly toxic. Her farts were carrying a particularly strong scent of vegetables. Carrots and garlic in particular, underpinned with wilted spinach and just a hint of the strong blue cheese she had eaten with her lunch.
She grinded her greedy pussy up against one of the Nightmare Night decorations. A little wooden statue of Nightmare Moon, whose muzzle had been drenched in marecum. But with the smell in the air getting worse and worse, Fluttershy was desperate for a closer sniff. She had tried twisting her body into a position to get her face as close to her own ass as possible, but she just couldn't. Using her wings to waft her farts at herself was working effectively, but she wanted to feel, and smell, gas from another source altogether.

As she lumbered over to the rest of her friends, her legs shaking, she leaked a continuous stream of hot, hole-burning methane behind her. She searched for a target, filled with lust, her tongue now hanging through her lips like a wet chorizo and drooling.
Pinkie Pie was the only pony by herself. She was still ripping squeakers and laughing at the sound. There was no way she could anticipate what was coming next.

"Ay Ay Ay!" Pinkie lurched and farted when a soft yellow snout slipped between her cheeks.

"Ummm, if you don't mind Pinkie, could you maybe pin me down under your fat bubblegum plot and gas me unconscious?"

"I thought you'd never ask!"
She raised her rump up in the air, giving a little wiggle of preparation before thrusting it down onto Fluttershy, and in turn bringing the pegasus tumbling to the floor on her belly.
Pinkie straddled the top of her head, her cheeks large enough to wrap around each side of her face, and started letting loose.
She didn't hold back, showering wet flatulence all down Fluttershy's face, dusting her in her vulgar brand of curdled lactose gas. Her fluffy tail levered up and down with each one, wobbling a bit when a longer fart burbled out.

Fluttershy, with her entire head now buried beneath Pinkie's heavy rump, had her own rear end up in the air, forming a kind of downward dog position. Her hoof blindly fumbled up and played with her clit, scrubbing her chubby nub in a quick circular motion. Her snatch winked open with a juicy snap, spreading her light pink inner lips for all to see. She was about to to cum to the smell of Pinkie Pie's damp, milky flatulence and it felt so filthy, but concurrently so amazing.

Luckily, however, Rainbow Dash had noticed Fluttershy signalling arousal. She wasn't one to leave her friend hanging (or winking in this case), so, with Twilight still trailing behind her, she licked her chops and jammed her dextrous mouth right into Fluttershy's muff. She treated her to the same degree of expert vag munching Twilight had received, pelting her tongue around inside, using her lips to get some extra leverage, even joining Fluttershy's hoof in stimulating the stiff clit.
Of course, like Twilight, all this provocation loosened up Fluttershy's second hole, and soon it chuffed Rainbow Dash's face with delicious vegetal fumes.

It only took a matter of seconds for Fluttershy to burst her dam. She inhaled Pinkie's creamy guts as she came, her entire body was a mess of shuddering arousal. Ropes of spicy cum shot down Rainbow's throat, and they just kept coming and coming. Fluttershy cried out in pleasure, her voiced cracked as she screamed, and for the first time tonight one of her farts actually made some noise. No more than a little tweet, but a noise all the same.

The corruptive Everfree magic twisted another knot into the group's collective psyche. The barn was alive with so many raucous farts that it was impossible to even tell which sound was coming from whom without sticking your ear up against the source. The only thing to pierce through the wall of sound would be a sigh of relief or pleasurable moan.
This spell had originally been constructed for only the highest beings in Equestria. It was one of many enhancements Celestia would call upon for her more hedonistic royal orgies. Even for an alicorn this brand of magic was extreme, but let loose on a group of little ponies it was ensured that the entire night would be filled with gassy, lusty antics.

And that is exactly how the night proceeded. The barn exploded with an endless bombardment of flatulence, and the mares inside exploded with an endless string of orgasm and bliss.
They farted and fucked many, many hours into the early morning. It wasn't until breakfast that Big Macintosh discovered them winding down, frazzled and panting for fresh air in their little stew of methane, sweat and cum.
The smell, varnished into every inch of that barn, was so horrendous and persistent that it would take weeks of airing out and several thick coats of lead paint before any of the animals would even agree to step hoof back inside.

The six ponies never spoke of that evening again, mostly because to all of them it was little more than a blotch on their memories. They simply couldn't recall a single moment after entering Applejack's barn, but the effects of the spell did not end there.
Even if they all kept it private, each of the six started noticing strange urges that had not been there before. Whenever they ripped a particularly pungent fart, they would feel a little tingle in their nethers. Whenever one of them was using a public bathroom, they would be overcome with the strangest desire to hoof off to the sounds and smells of the other occupied stalls. Twilight never did investigate the enchantment any further, unable to even remember such a spell in the first place. Even if the events of that night were soon forgotten, the newly-acquired kinks only grew with time in the minds of the six friends. Altered forever by one very fateful, very smelly Nightmare Night.