The Biggest Sleepover Ever

by callyoops2

Rating: mature
Tags: Random, Pinkie Pie, Twilight Sparkle, My Little Pony: Friendship is Magic, Rainbow Dash, Porn, Fetish
Length: 3364

Twilight is going to have a sleepover with Rainbow and Pinkie. Unfortunately, Pinkie finds an experiment in Twilight's fridge that will lead to some interesting results. (inflation fetish fuel with the lightest wrapper of a story.)

Twilight is going to have a sleepover with Rainbow and Pinkie! Unfortunately, Pinkie forgets the frosting for her cupcakes, but finds what she believes is a suitable replacement in Twilight's fridge. All three of them are in for a big surprise.

(inflation fetish fuel with the lightest wrapper of a story.)

Published 2019-11-04 04:20:02 UTC
Last updated 2019-11-04 04:20:02 UTC

One to Remember

Sitting at the table in the throne room, Twilight busied herself with a book on griffon customs. She was really half paying attention partially because she found their customs boring, and partially because she was waiting for some visitors. Luckily she only had to endure only thirty minutes before the door opened. Twilight’s ears flicked up in surprise and a broad grin graced her features as Rainbow and Pinkie strolled into the throne room of the castle.

“Girls! I’m so glad to see you! With everything being so crazy lately, I’ve been dying to spend some time together!” she beamed as she held her right hoof up in the air. Rainbow wasted no time in speeding across the room and giving her hoof a bump.

“You’re telling me! With the Wonderbolts touring everywhere from Las Pegasus to Manehattan, I haven’t had much time for friend stuff. This slumber party is just what I need!”

Two pink hooves appeared from behind both of them and wrapped them in a vice-like hug. Twilight and Rainbow grinned through the pain as Pinkie’s ever present smile loomed over them.

“Heck yeah! This is gonna be great!”

As the two ponies wriggled free, Twilight raised an eyebrow. “I know Rarity and Applejack were too busy to make it tonight, but where’s Fluttershy?”

“I stopped by her cottage on the way over,” Rainbow began. “she has some sort of emergency with a sick animal. She said she would be by later.”

Pinkie started pronking in place, now holding a basket that both Twilight and Rainbow could swear wasn’t there a moment ago.

“Oh, oh, oh! I need to get to the kitchen and start baking if we’re going to have yummy baked goods for the slumber party,” Pinkie explained impatiently.

Twilight gave her a nod. “Go right ahead; Rainbow and I will be in the guest room getting everything set up. Come join us when you’re ready.”

With a nod, Pinkie made her way to the kitchen, bouncing all the while. Rainbow and Twilight shared a grin, but Rainbow was the first to open her mouth. “Come on, the sooner we get things ready, the quicker we can start the slumber party!”

Twilight rolled her eyes, but followed anyway as Rainbow left a trail of dust and chromatic blur in her wake.

The pink tornado arrived in the kitchen and immediately began unpacking her basket. Looking at her ingredients, the gears in her mind started to turn.

“Hmmm, let's see. Cupcakes, cookies, or pies?”

Recent events managed to surface through the tidal wave of chaos flowing through Pinkie’s mind.

“We’ll skip the pie this time.”

Like a whirlwind, Pinkie set about her task of making cookies and cupcakes. Eggs were broken, milk was poured, sugar was also poured, but in a much more vicious way. Everything culminated into two pans being thrown in the oven and a mental timer starting in Pinkie’s head. She turned to prepare her frosting for when the cupcakes were ready, but found none forthcoming. Digging through the basket she brought with her, she realized a terrible truth.

“I forgot the frosting!”

Falling to the floor in a manner befitting Rarity after having a brand new dress ruined, Pinkie looked a miserable sight.

“Wait!” she cried, jumping to her hooves. “Maybe Twilight has some frosting!”

Opening the fridge, she rummaged through it but found nothing. Her eyes fell on a drawer chained and locked, but this took all of five seconds for Pinkie to bypass and open. Inside, she saw several containers, many of which looked to be filled with very inedible things… and a tub that looked exactly like the ones frosting came in. With an excited gasp, she pulled it out and smiled at her new treasure. The word vanilla was written on the side in marker. On the top there was some other writing as well which Pinkie did her level best to read.

!ecnatsmucric yna rednu esu ton od, etutitsbus doof latnemirepxE

Pinkie stared at the words for a moment before a giggle escaped her lips. “Must be imported!”

In one motion, she scooped the entire contents into a bowl and prepared for the cupcakes.

“This will be the best slumber party ever!”

Twilight and Rainbow were just putting the final touches on the guest room. Lots of space was made in the middle for games and activities, and though it took some coaxing, Rainbow finally convinced Twilight they would only need one book for the sleepover. No sooner had they laid several blankets on the floor did the door open and reveal Pinkie balancing a plate of cookies on her flank and a tray of cupcakes on her nose.

“Oh wow, you two are already done, huh? Great! That just means we can start sooner!”

Pinkie haphazardly bucked and nudged both treats into the air where they landed safely on the floor. Rainbow and Twilight said nothing because they knew that was honestly the best way to handle Pinkie's physics defying antics.

"These look delicious, Pinkie!" Twilight exclaimed, grabbing one of the cookies and taking a bite.

Pinkie giggled and threw three of the cakes into the air, catching each of them in her mouth and chewing them noisily. "Thanks! Cupcakes are my specialty!"

The lights dimmed, making both ponies look around until they saw Rainbow wearing a creepy grin. "Laugh and grin while you still can, because it's creepy story time, and I've got one that will leave you two shaking in your hooves…"

Pinkie and Twilight listened in rapt attention as Rainbow regaled them with a tale of a pony trapped between this dimension and the next. Between Rainbow and Pinkie, seven more cupcakes vanished. Rainbow's gleaming, narrowed eyes swapped back and forth between her two audience members.

"The foals stared at the door, huddled together, watching with wide eyes as the door began to creak."

Feeling a draft on her side, Pinkie reached for the edge of the blanket she was under to tuck it beneath her. Her hoof touched something squishy that made a soft blorp.

Rainbow and Twilight both turned to look at her, curious as to what made the peculiar sound.

"What was that?" Twilight asked, a shiver going through her, still enraptured by Rainbow's story.

"I-I don't know," Pinkie said, confusion written on her face. "I feel kinda funny."

Reaching over to the lamp, Rainbow gave it a jostle, making it brighten up. Her eyes widened in shock. "Pinkie! What in the hay happened to you?!"

In the brighter light, Rainbow and Twilight could both see the pink pony resting on the swell of her belly, which was slowly growing in front of them. Gurgling and swelling, it slowly continued pushing Pinkie up, rounding out all the while.

Twilight, nearly in a panic, jumped up and pulled off the blanket. Pinkie's belly was now swollen to the point where she could fit multiple ponies inside it with no trouble. Rolling the mare back a bit, Twilight found herself biting her lip at the sight of the ballooning pony in front of her, and the gurgling noises her belly was making. Giving Pinkie's belly a prod, she was rewarded with a moan.

"Twiliiiight, it's really sensitive."

It sounded halfway between a complaint and a plea.

"A-are you in any pain?" Twilight asked.

"Nuh-uh. It kinda feels good, real good," the pink pony said as she started poking, prodding, and squeezing her six foot round and growing belly.

"Nnngh, Twilight?"

The alicorn's ears perked up. She turned to Rainbow and saw that her belly also seemed to be growing, nearly touching the ground. "What is this?"

Turning to the pegasus, she fired up her horn and started scanning for any magic. "You're clean, and so is Pinkie, but you're both… blowing up. I've never seen anything like it!"

Pinkie's belly by now had gotten to the point where it was engulfing the rest of her body. Her hooves began pulling in as she gurgled and swelled even larger. Twilight planted a hoof on the pink pony's body and felt a pleasant squish around it. She didn’t know why, but the sight awakened something within her. Were there any other ponies in the room, she might feel wrong for having these feelings, but with two of her best friends, she had no problem with the arousal building inside.

"Wow, Pinkie. You're so huge." She had a hard time keeping the excitement out of her voice.

"Twilight…" Pinkie panted between moans. "Knead me, please. Rub and squeeze me all over. I'm just so big and I wanna get bigger!"

Twilight didn't need to be told twice. She climbed onto Pinkie's bloated belly, feeling it give pleasantly. "I don't understand. Why are you two blowing up like this and not me?" She wondered aloud as she poked and prodded into Pinkie's great big ballooning belly. Already it was pushing against one wall, and expanding toward the others. Rainbow in the meantime had only gotten a little larger than before, her stomach now pushing against the floor.

"Twilight! What in the hay is happening to us?!" Rainbow pleaded.

The alicorn was only half aware of the pegasus pony's plight. In her addled mind, she ran the questions through her mind, but they crashed against the waves of arousal and sheer sexual need.

"Did either of you-mmmm-eat anything tonight?" Twilight asked through a brief and pleasured moan as her hoof made its way to her wet lips.

"Just the cookies and cupcakes," Rainbow told her. The pegasus felt a growing heat rise in her nethers too, and a blush on her cheeks gave this away.

The gurgling and groaning from Pinkie's absurdly pumped up body only got louder as she swelled bigger, and bigger. Her cheeks began to bulge with the effort of keeping her belly together. Needy and sensual moans rose from the pink pony's lips as she blimped beneath Twilight, for whom thinking was quite difficult.

"I ate two cookies," Twilight announced to no one in particular as she started to grind against the balloon Pinkie had become.

"I afe boff," Pinkie squeezed out through her puffy cheeks.

Twilight’s grinding came to a stop. Pulling her hoof back, she stared at the juices collected on her hoof for a moment before it clicked. "Pinkie, did you bring everything you needed for cooking?"

"Numpf," came the muffled reply.

"What did you use here?" Twilight asked, her eyes narrowing.

"Fwostinf."

And suddenly everything clicked into place. Sliding off of the hill Pinkie's belly had become, Twilight landed gently on her hooves. Walking over to the plate of cupcakes, she realized there were five left. With a wry and lustful grin, she laughed at the swollen parodies her friends were becoming.

"That was my experimental self replicating frosting. It was a work in progress. I was trying to come up with a way to make food that could feed more ponies, but it was far from completion. Looks like we have an accidental experimental trial run on our hooves."

"Wha- what does that mean?" Rainbow asked. With a three foot round belly, growling and gurgling, she was in no position to move.

"It means, you two are gonna rise like two loaves of bread until your bodies forcefully expel the frosting." Twilight explained. Walking toward Rainbow with the plate in her magic, she lifted up one of the cupcakes and held it near the pegasus' mouth. "You've got some catching up to do." She said as she crammed the cupcake into Rainbow's mouth. She chewed the cupcake the bare minimum amount that would let it go down her throat simply because she didn't feel like she had any choice in the matter. The moment the gooey mush went down, two more cupcakes were crammed into her mouth. Twilight smiled as the normally svelte yet muscular pegasus continued to bloat.

"I need a nice soft cushion to sit on while I watch Pinkie go. You'll do nicely," Twilight said, climbing on the back of the swelling pony. She made sure to climb slowly, letting her wet nethers rub against Rainbow's tightening form. Cramming the last two cupcakes into the pegasus' muzzle, she gently turned Rainbow's head to look at Pinkie's absurd form.

A round pink mass took up the entire other side of the room. Divots had formed where her hooves once were. The only recognizable part of Pinkie left was her dripping, swollen marehood. Her taut skin wobbled and groaned as frosting continued filling her like a giant pink eclair bursting with cream. The heat building in Rainbow's own nethers told her she was next as her belly also rapidly filled with the fresh injection of frosting. Rising on the dome of her belly, Rainbow could do little else but pant and moan as she too swelled.

"Bloat for me, Dash," Twilight cooed as she ground her needy lips against the pegasus.

"B-b-b-but I don't want to pop, Twilight."

Rolling her eyes, Twilight slid down her blue toy and walked over to Pinkie's quivering pussy lips.

"I guess I'd better show you there's nothing to worry about."

Lowering her head toward Pinkie ballooning lips. She stuck her horn inside her pink friend, earning her a delighted gasp. The blimped up mass that was Pinkie tried her best to buck against Twilight's horn, but it didn’t do much. A soft pink glow started at the base of her horn, spread to the tip and ended with a flash.

"Unnnguh!" Pinkie exclaimed in post coital bliss.

Pwssshhhhhhhhhh!

An angry hiss erupted in the pink pony as she rapidly ballooned in size. Marecum seeped out of her spasming marehood, soaking Twilight's head and horn in the sickly sweet fluid. With each spasm, pinkie filled out even more and the fluid started turning creamy and white.

"Here it comes," Twilight warned.

POOOMF!

The Pinkie blimp exploded in a shower of white, sending frosting all over the room, covering every surface with the sticky topping. Watching the whole affair happen drove Twilight to the edge. She furiously rubbed her marehood, lost in the moment.

"Oh, Celesti-AAAAAAAAH!" Twilight shouted as she ground out an orgasm against her hoof.

"Twilight? TWILIGHT!" Rainbow shouted, finally getting through the alicorn's post climax fog.

"Pinkie exploded! What's wrong with you?!" Rainbow asked, berating her.

Lighting up her horn, Twilight managed a shaky spell, clearing away a mound of frosting. There, beneath the vanilla mountain was Pinkie, eyes closed, tongue sticking out, and most importantly, perfectly fine as far as the ballooning pegasus could tell.

"I'd never let one of you get hurt, but since she was careless enough to use it, i thought we'd have some fun. By the way, you're next.

A cold chill went through Rainbow as Twilight turned to her, hoof filled with a big mound of frosting.

"T-Twilight, I don't know if I can-Mmph!"

Rainbow never got to finish her thought as the alicorn pushed the frosting into her mouth. The pegasus was already nearing the ceiling, gurgling and groaning as she swelled, but the extra infusion of frosting only served to speed the process up.

"Blow for me, Rainbow." Twilight demanded. Hoofful after hoofful of frosting went into Rainbow's mouth. She struggled to keep up with Twilight's relentless assault of creamy frosting. Once her cheeks started puffing outwards with the effort of keeping herself together, she saw Twilight walk around out of her sight. Needless to say, Rainbow wasn't surprised to feel Twilight's horn penetrate her bloated and swollen marehood. After a brief tingle and flash, Rainbow felt the most peculiar feeling.

All at once, she felt electricity flow through her whole body. Passionate, needy moans soon fell away as she fell off the precipice and into the most intense orgasm she'd ever felt. Pleasure wracked her body as she quickly swelled up like a balloon, filling half the room. Gushing marecum dribbled out of her sex as an intense pressure filled the pegasus. The backlog of frosting rapidly shot toward every exit Rainbow had. Groaning and quaking, Rainbow's body neared detonation as Twilight withdrew her horn. Reaching out with her hoof, she slapped the pegasus' side.

"Boom!"

POOMF!

Once more, frosting exploded all over the room, leaving mounds of the creamy stuff all over the room. Pushing a nearby pile of it away, Twilight found the blue pegasus, eyes crossed, hips bucking, and mouth drooling.

"My turn," Twilight said, lying down on her back. Reaching around her, she scooped up hooffuls of the frosting and began pushing it inside her dripping sex. In between each hoofful, she would scoop some into her mouth and rub her gooey lips. Already it had a dramatic effect on the alicorn's physique as her belly began pooching out, rising like a dome.

"Mmmf, more, more!" She moaned in ecstasy. She kept pushing more and more frosting into her pussy until her hooves could not reach around her bloating belly. At that moment the door to the room opened.

"Sorry I'm late girls. I had an emergency visit from two squir-"

The explanation died on Fluttershy's lips. All she could see was a white cream like substance covering much of the room, and Twilight's private bits on display as she packed them with cream. Fluttershy quickly slammed the door and galloped out of the castle at full pace.

Dead to the world, Twilight didn’t notice the intrusion. She was more focused on the eight foot sphere her belly had become and the throbbing need between her legs. Using her magic, she kept a steady stream of the frosting flowing into both her mouth and marehood as she quickly grew out of control. In a mere minute, she was already as big as her friend's maximum sizes.

"Wanna pop, wanna pop, wanna pop!" Twilight pleaded. She was briefly saddened by the fact that she would not get the horn like her friends did, but she quickly cast the spell on her rapidly inflating pussy lips anyway.

A low, guttural groan echoed in the alicorn's body. All at once, the pressure inside reached a crescendo.

"Mmmph!"

Any words on the alicorn's lips fell short as her cheeks ballooned rapidly. Her body bloated explosively, quickly pushing the frosting aside as her belly pancaked against the ceiling. Every last rational thought left Twilight's head as she rocked through an explosive orgasm. Gouts of marecum and frosting shot out of her marehood. The creamy liquid quickly filled her mouth and started pushing out. The big purple blimp quickly inflated toward every wall of the room, filling it until nothing but purple and white could be seen.

And then she felt it. With a sigh, the last bit of pressure gave way to pleasure.

POOOOOMF!

When Twilight awoke it was to the sound of scrubbing. Slowly, the fog began to clear in her mind until she felt cool porcelain on her cheeks. Stirring from her stupor, she realized she was sitting in a bathtub along with Rainbow Dash and Pinkie Pie. slowly she craned her head until yellow entered her blurry vision.

“Fluff-fwuff, fluttbutt?”

She received a stern look for her trouble as Fluttershy stopped scrubbing the white frosting off of Pinkie long enough to shake her head.

“Twilight Sparkle. I don’t know what in the world you were doing, and I don’t wanna know. All I do know is I’m supposed to be having a relaxing sleepover and then I… I had to see you like that.”

Still in an addled stupor, Twilight pulled Fluttershy to her and, with a giggle, kissed her on the lips. The pegasus stared with a scandalized look and a slight blush.

“Don’t worry, you can go next, “Twilight muttered as she lay her head on the side of the tub. Sleep overtook her as the world faded to black.

Author's Note

Well, I finally came up with something to write. I know it won't be everyone's cup of tea, but I hope you enjoy regardless.

I'd like to credit Lyranis for helping me out by proofreading this fic post launch and making it the best it can be! Big thanks!