Calling in a favor.

by callyoops2

Rating: mature
Tags: Rainbow Dash, Romance, Sex, Random, Pinkie Pie, Twilight Sparkle, My Little Pony: Friendship is Magic
Length: 4074

Pinkie Pie tests a potion on Rainbow Dash. Nothing goes wrong... nope... not at all... Shameless fetish smut involving inflation, and weird pregnancy.

Pinkie Pie calls in a favor and asks Rainbow Dash to come over and to try out a potion. Nothing could possibly go wrong... right?

Shameless fetish smut involving inflation, Weird pregnancy, and clop.

Published 2013-05-22 10:20:01 UTC
Last updated 2013-05-22 10:20:01 UTC

what could possibly go wrong?

“Ugh, all right Pinkie, let’s get this over with.”

Rainbow closed the bedroom door behind her per the pink pony’s orders. Pinkie had long since bounded in and started rummaging through her dresser for Celestia only knows what.

“Just a minute Rainbow! You can sit on the bed until I’m through,” Pinkie called out to her.

Rainbow hopped up on the pink pony’s bed. She had to admit, Pinkie had the softest bed she had ever seen or had the pleasure of using in secret times. She watched impatiently as Pinkie finally spun around with a vial of some sort of liquid.

“Uhhh Pinkie, what is that? Rainbow asked.

“This? Just a little something I’ve wanted to try for a while now. Are you ready?”

Rainbow shrugged. “I don’t even know what you’re going to do, but I owe you that favor so I don’t really have a choice do I?”

“Nope!” Pinkie announced happily. She drank the vial in one go and tossed it aside. The pink mare then just stood there for a few moments while Rainbow stared.

Before long Pinkie uttered a surprised squeal. Rainbow cocked her eyebrows uncertainly.

“Uh, are you ok?”

The pink mare started moaning while Rainbow watched her in morbid fascination.

“Ooooh. Rainbow, I can feel it working already.”

“Feel what working Pinkie? What’s wrong?”

The pink mare turned toward The pegasus. “You should, oooh, lay down at the end of the bed.” She moaned out.

“Uhhh ok...” Rainbow said. She slowly moved to the end of the bed still facing Pinkie.

“No silly, turn around!”

Rainbow suddenly felt like she knew where this was going, after all, she and Pinkie played with toys all the time, though she hardly expected that the pink mare’s favor would just be a pleasurable visit.

“You’ll have to give me a little bit to get loosened up if we’re going to use that purple one again Pinkie.”

“Not this time Rainbow, I’ve got a very special toy this time.”

The pegasus sighed. “Pinkie, I told you I’m not ready for another size up, I wanna take it slow for once, as weird as that sounds coming from me.”

“No toys this time Dashie, this time, It's au natural.” The pink pony said suggestively.

Rainbow glanced back and did a double take. Right between Pinkie’s legs poking out of her brand new sheath was a growing member.

“What the hay did that potion do?!”

Pinkie simply smiled seductively and closed the gap between her and the pegasus. Just looking at Pinkie’s brand new cock growing out of It’s sheath started making her wet.

“This time Dashie, we play for real. She said. The pink pony got close to the prismatic pegasus' tail and inhaled deeply. Ahhhhh. I’ve always loved the way you smell Dashie. It’s like being in a fresh rainstorm.”

Rainbow had a hard time controlling herself as she continued looking back at Pinkie who was currently lubing up her new tool. She instinctively flicked her tail aside, presenting her dripping and winking marehood to the pony eyeing her. Her mind was at war with itself. Part of her was scared of Pinkie’s new appendage, as it was larger than any toy they used before, but the other part of her loved a good and fast pounding. Right now though, she was afraid a serious pounding might hurt in more ways than one.

“Hey uh, do you think we could take this a bit slower than normal?” She asked.

Pinkie jumped up on the rear of the bed and poked Rainbow’s dripping sex with her rock hard member. She leaned in close to Rainbow’s ears.

“Not a chance.”

Pinkie, without hesitation, rammed her shaft hard into the pegasus' wet lips causing an obscene wet sound from her nethers. Rainbow yowled half in pain, half in pleasure as she felt Pinkie bottom out inside her, her new sack slapping the pegasus’ backside.

“Ahhhh! Pinkie! Please take it easy!”

Her pleas fell on deaf ears as the pink pony started pistoning the prone pegsus beneath her. Each thrust of her hips elicited a sensual and pained moan from Rainbow.

Pinkie’s insistent pounding of her fleshy appendage, and Rainbow’s moaning which ceased sounding painful, and now sounded needy sparked a higher level of ecstasy in the room.

“Oh, oh Celestia, hah, Pinkie... Please keep going!”

Pinkie obliged her, not like she was in danger of stopping anyway. She continued pounding Rainbow’s marehood, the fluids dripping onto her comforter and soaking the sheets beneath them.

Rainbow meanwhile was on the cusp of an extravagant climax. “Oh Pinkie, I can, I can feel it, keep going!”

Pinkie leaned forward and nibbled Rainbow’s ear.

“Oh Yes Pinkie! Do it harder!”

Pinkie slammed her thick rod home forcefully and yanked Rainbow’s tail. The pegasus yowled in pleasure as she fell under the greatest orgasm to ever crash upon the waves of her mind’s shore. Rainbow’s pleasure sent Pinkie into her own frenzy. She started slamming the pegasus' tight hole as a new feeling over took her.

Rainbow, still recovering from her orgasm felt an acute tightness from her sex. She glanced back at the pony rutting her carelessly and nearly fainted. Pinkie’s cock had grown quite large and was steadily swelling before her very eyes adding to the pressure in her stuffed cunt. In addition, the tight little sack between Pinkie’s legs had swollen as well. It had grown to encompass what space was left between the pegasus' dripping sex, and the edge of the bed, and indeed, had started growing off the edge of the bed.

“Pinkie! What the hay is happening to you?”

Pinkie kept pounding he pony beneath her.

“Ngah! No, no worries, ungh, Rainbow! It’s all, unf, going according to plan!” She moaned out.

“Rainbow saw Pinkie’s cock swell acutely and knew what was coming.”

“Pinkie! No! You can’t cum in there! Pull out!”

“But Rainbow!” Grunted the pink pony. ”That’s the whole, ungh! Point!”

Rainbow, knowing that the party pony was beyond reasoning with knew she had to move. She tried squirming away from the pink pony stretching her abused cunt, but found that Pinkie’s cock had swollen further creating a powerful seal. She felt Pinkie fall on top of her.

“Oh Celestia, I’m cumming Rainbow!”

The Pegasus tried squirming again desperate not to be seeded by the crazy mare rutting her, but the pink pony wrapped her legs around the athletic pegasus' own legs.

“Pinkie! No!”

Pinkie grunted and shot her first massive load into Rainbow’s vagina. The Pegasus felt Pinkie’s member growing ever larger inside her as it blasted her over and over again basting her with Pinkie’s boiling seed.

“Pinkie! Stop it! Get off me!”

Pinkie disregarded Rainbow’s pleas and continued pumping liter after liter of semen into the pegasus' twitching cunt.

“P, Pinkie! Knock it off!”

Pinkie continued pumping more and more of her viscous seed into the pegasus’ pussy, enjoying the immense feeling of release.

Rainbow felt her belly swelling beneath her, pushing her upwards and spreading her legs apart.

“Oh, oh! Pinkie, I’ve gotta pee really bad!” Rainbow felt her belly grow even faster as the pink pony kept pumping even more into her. Gallon after gallon of fresh seed flooded her uterus and put even more pressure on her burgeoning midsection. By now, her hooves no long touched the ground, instead, the only way she had of keeping herself steady was to wrap them around her billowing midsection as the continuous flow of semen from the party pony bloated her even farther.

“Oh yes Rainbow, you're my big ballooning Pegasus.” Pinkie breathed out between moans.

Rainbow hoped her fate would be different than the ones of the pony’s other balloons.

Pinkie arched her back once more and groaned sending out one final burst of seed. Rainbow felt her belly surge once more as she lurched forward from the immense amount of cum pumped in all at once.

Rainbow felt the tension in her sex slack up as Pinkie’s member softened inside her.

“Thank Celestia...”

Pinkie dismounted the pegasus allowing her a bit of relief.

“Pinkie... What the hay were you thinking?” She asked. “I told you not to cum inside! What the hell kind of potion was that anyway? I can’t even move!” Rainbow complained as she flailed her legs angrily.

Pinkie pulled out allowing some of the trapped cum to escape Rainbow’s vagina. This relief was short lived however as Pinkie jammed a plug into Rainbow’s leaking sex instead.

“What do you think you’re doing?!”

“I’m plugging you up silly. It’s the only way it’s gonna work after all.”

“The only way what’s gonna work?” Rainbow growled.

“I dunno, but we’ll see won’t we?”

This wasn’t what Rainbow signed up for. She didn’t like the idea of sitting around at all, much less being immobile. She struggled and waved her hooves uselessly causing her belly to make a loud sloshy sounds.

“Rainbow, take it easy. I don’t want you to hurt yourself!”

Rainbow huffed at the pink pony.

“What am I supposed to do? I’m trapped here, I can’t even get something to eat like this!”

“Oh` don’t worry! I’ll cook up and bring you any treats you want! Anything! You’ll see! I’ll take good care of you.”

The pegasus was dubious of the pink pony’s claim considering how well she had been treated so far, but decided it might be worth enjoying what she could.

“Anything huh? How about some of those triple chocolate fudge and cocoa cupcakes of yours?”

Pinkie nodded enthusiastically and bolted for the door.

“And don't forget the milk this time!” Rainbow called after her.

~

Rainbow and Pinkie watched several movies as the cupcakes disappeared between them. As time went on, the beanbag sized belly the pegasus was sporting had shrunk a bit and started turning hard. She wasn’t sure what was happening to her, but it sure felt odd. She let loose a yawn as the last movie came to a close.

“I’m tired pinks. I think I’m gonna ht the hay.”

Pinkie ran up to her and wrapped her arms around the bloated pegasus giving her a big hug. G’nite Rainbow dash!

~

Rainbow awoke to the sound of hissing. The fog around her eyes cleared bringing her around from a chocolate induced coma. When her eyes opened fully she noticed that Pinkie seemed smaller. Glancing around, she realized that Pinkie wasn’t smaller, Rainbow was taller… or so she thought. Her extra height was due to her swelling belly!

“Pinkie! Help!”

The pink mare stirred and looked the pegasus up slowly.

“Holey moley Rainbow! What happened to you?”

“I dont know! You’re the one who took the potion! What was it supposed to do?!”

Pinkie poked Rainbow’s swelling belly tentatively.

“I dunno! According to the recipe it was just supposed to make a normal orgasm ten times more powerful!”

“And you didn't think me being filled up like a water balloon might’ve been a clue something was wrong? Nice going sherclop holmes!”

Pinkie poked Rainbows midsection again. The taut belly made an echo and hollow sound above the sound of hissing.

“Ummm I think I’ll go get Twilight. I don’t think this was supposed to happen.” Pinkie said bounding out the room.

“Wait!” The pegasus cried out. Unfortunately Pinkie had long since run off. Rainbow sat on the bed, immobile and confused as the hissing continued stretching her even more. Craning her neck to the mirror she saw her normally slim and athletic belly stretched absurdly to the size of a weather balloon. Panic set in as she wondering how big she would, or even could get...

A few minutes passed like this as she wondered what the heck was happening to her before she heard clopping hooves from the hallway.

“By Luna’s mane! Rainbow, you're huge!” Twilight said taking in the comical sight.

“And you’re an egghead! Listen, do something about this will ya!”

Twilight turned to Pinkie who sat there dumbfounded.

“Ok Pinkie, I need you to focus, what did you put in the potion?”

Pinkie ran to her dresser and pulled out a parchment and dropped it at Twilight’s feet.

“Ok, lets see...'hmm willow root, that’s right, expired milk, oh my gosh, I think I know what happened!”

“Tell me!” Screamed Pinkie and Rainbow at once.

“You used a heart’s desire instead of a heat of passion herb. Pinkie, Rainbow is pregnant!”

Rainbow panicked, “What? No, no, no! This is why I told you to pull out you nut!”

“Relax Rainbow, It’s not what you think, you won’t be having any ponies.”

“Huh?”

“Here, the best way to do this is just to show you, besides, It’s the only way to fix this.” Twilight’s horn glowed enveloping Rainbow’s swollen belly.

Rainbow felt her stomach churn and cramp. ”Twilight, what in the hay are you doing?”

“I’m inducing labor. The unicorn replied. Just like that, the aura disappeared. The hissing in Rainbow’s belly intensified and started pushing her closer to the ceiling.

“I don't think it worked!” the Pegasus shouted.

“Yes it did! Pinkie, pull out that plug.”

“Pinkie nodded and walked over to the pegasus bloating out of control and removed the plug from her slick marehood. What she saw next nearly floored her.

“Oh my gosh, is that what I think it is?”

Rainbow immediately felt pressure in her crotch and pushed. A loud squeaking cut through the air and the pressure subsided momentarily. Moment’s later Rainbow heard a dull thump against the ceiling.

“Congratulations Rainbow, you’re a mother...I think...” Pinkie said, her voice trailing off.

Rainbow looked behind her and saw a large red balloon resting against the ceiling, filled to bursting with what she guessed was helium since it was floating.

“What the! Ponies can’t have balloons!”

“Actually that was Pinkie's fault.” Twilight interjected. “When she accidentally swapped out the heat of passion herb for the heart’s desire, instead of Pinkie’s ummm... Stuff, giving you both a mindblowing orgasm, it gave you something else. Something directly related to her special talent.” She said pointing to the three balloons on Pinkie’s flank.

Rainbow’s back hit the ceiling as the balloons inside her fought for more space in her crowded womb as they swelled.

“Great! At least I’m not having any ponies. How many balloons am I supposed to have anyway?”

“Ummmm...” Twilight started.

“Ummm? I don’t like umm.” Rainbow growled.

“Maybe one or two-“

“Does this look one or two balloons?!” The Pegasus yelled.

“I wasn’t finished, one or two hundred…”

Rainbow's face paled. She didn’t have long to since there dumbfounded as she felt another balloon slide down her canal. Rainbow let out a little gasp as the balloon shoved it’s way forcefully out of her sex, now dripping with fluid.

Twilight stared as the balloon, this time a long one, popped out and floated to the ceiling.

“Well, at least it doesn’t hurt like normal birth.” Twilight pointed out.

Rainbow felt the pressure on her massive belly increase as she was pancaked more and more against the ceiling. She would probably be panicking if the stretching and pressure on her skin wasn't so sensitive.

“Actually, it feels really good, especially when they slide out. But if I don’t start popping them out faster, were gonna run out of room.” She warned. Her breath hitched as a 26 inch balloon, stretched into a tube shape by her marehood’s narrow and tight canal popped out. The balloon still dripping with her juices and free from rainbow’s vaginal walls shaped back into a normal party balloon shape and joined the other two balloons at the ceiling.

“Pinkie, help me push her off the bed so she won’t be squished!” Twilight ordered

Both the unicorn and the earth pony put their hooves on Rainbow’s burgeoning belly and gave a forceful push. Squeaking came from the pegasus' as they jammed their hooves in.

“I, urgh! I don’t know Twilight, she might be stuck!” Pinkie said.

Rainbow barely took stock of the situation. She was lost in the throes of pleasure as her friends hooves pawed at her belly. Each prod and poke sent shivers through her.

Twilight got a sudden Idea. “C'mon Pinkie, well have to use our legs! On three, one, two, three!”

Both ponies Reared back and bucked the bloated pegasus. Three balloons pushed out of the massive mare’s vagina slick with her juices. A sharp feeling of pain and pleasure eeked through her as she finally popped free from between the ceiling and the bed. Rainbow rolled across the room until she hit the wall with a light drum like sound which echoed throughout her body. She ended up on her back, her swelling belly and crotch pointed towards the ceiling. Rainbow started rubbing herself as best she could using her mostly useless hooves. Each prod caused a cacophony of squeaking from within. Before long her gentle but firm pokes devolved into full on pounding, each blow adding to the pleasure.

“Well at least shes enjoying herself twilight mused.

“But Twilight! Rainbow’s still blowing up like a balloon! And you know balloons can only get so big before they...” The pink mares words trailed off.

“You’re right. We cant let her get too big.” Twilight added, staring as another balloon, this time a banner balloon, poked out of Rainbow’s marehood. Five feet of long balloon snaked its way out before it popped free and floated to the ceiling eliciting another pleasured moan from the immobile mare.

“Pinkie, I have an idea...”

“Okey dokey! What is it?”

“Jump on top of Rainbow as fast and hard as you can.”

Pinkie sat there for a moment. “Wait, I thought we were trying not to pop her.”

“I know it seems weird, but I think if you jump up and down you can force the balloons out.”

Pinkie nodded and eyed the pegasus warily as she tried to pick a place to leap on her blue friend’s swelling belly, again approaching the ceiling.With a careful leap she landed spot on. The extra weight forced a few party balloons to push out as well as a moan of pleasure.

“Ok Twilight, here I go!”

Loud squeaking echoed inside the room as Pinkie pranced happily on top of Rainbow’s belly. With each jump, the pegasus felt an internal pressure rising. She wanted so bad for something fill her marehood, but she had to settle for the occasional balloon escaping her lower lips. The jumping stopped abruptly however.

“Hey, whats with this? Pinkie asked. She looked down at the swollen parody of what once was Rainbow’s small and trim belly and saw at the very end two balloon like bumps with a nipple perched atop each one, fully erect. Out of curiousity, Pinkie wrapped her lips around one of the nipples. It swelled slightly in the pony's mouth and she felt something enter her mouth but didn’t feel any milk. Strangely enough she felt a fruity flavor touch her tongue and fill her entire mouth and nose.

“Thats strange- what the?”

Pinkie’s normal voice now sounded high pitched, higher than normal anyway.

“Hey Twilight, I think Rainbow is making helium!” The pink pony said staring as the breasts each nipple sat on swelled past the size of a party balloon.

“That’s really strange, maybe her body is reacting to her offspring by making... Helium? How do you even manage to screw these things up so badly?”

“I have no clue!” Pinkie pronounced proudly. The pink pony put her mouth back on the nipple twitching in front of her. The air slowly poured into Pinkie’s mouth which she greedily sucked down. The nipple in her mouth swelled as it filled the pony with it’s built up helium.

Pinkie! I need you to focus! We need to get the balloons out of Rainbow! Twilight demanded.

Unfortunately, Pinkie was lost in the fruity helium going down her throat. It was strange how it tasted so much like a fruity drink, but not a single drop entered her mouth.

“Ugh! You two are hopeless!” Twilight sputtered. She focused her magic on Rainbow, a red aura engulfed the Pegasus’ massive body.

Meanwhile, The nipple in Pinkie’s mouth had swollen massively touching the back of Pinkie’s throat. She instinctively swallowed the fleshy tube, as it exponentially increased the amount of air it was putting out. Pinkie’s belly swelled beneath her rubbing against Rainbow’s. Just then the ceiling pushed down onto the pink pony squeezing her into the blue pesgasus’ belly.

Focusing her magic, Twilight squeezed Rainbow’s massive form as hard as she could.

“AHHHHH YES!” Rainbow screamed out as an orgasm ripped through her.

Balloons of all shapes and sizes pushed out one after another in quick succession as the vicegrip like magic squeezed her all over. Twilight let go momentarily letting her magic build for a moment.

By now, Pinkie could swear the nipple in her mouth had reached her stomach. Truth be told she couldn’t care. She was too busy enjoying the intense feeling of being blown up like a literal balloon. More and more helium pumped her belly even further causing her to squeeze even more into the ceiling above her, and the pegasus below her.

Twilight stared wordlessly at the chaos in front of her. Rainbow’s massive form shoving balloons out of her crotch and Pinkie actively bloating herself with one of Rainbow’s helium producing breasts was something she wouldn’t soon forget. Annoyed and at her wits end, she focused her magic and squeezed once again on Rainbow. A shrill scream echoed throughout the room as a spray of fluid followed by balloons flew out of Rainbow’s crotch. The ceiling now had countless balloons of every type bobbing along carefree and antithetical to the chaos below them. The extra space caused by the balloons being pushed out was quickly taken up by Pinkie as she finally ingested enough helium to reach bouyancey. Despite Rainbows nipple still being lodged inside her, her flank, now as wide as a weather balloon, still floated upwards.

“Pinkie, you’re not allowed to make potions ever again.” Twilight said.

~

“Thanks Twilight, I owe you one.” Rainbow said offering her hoof for the unicorn to bump.

“Think nothing of it, though I certainly don’t want anything to do with you and Pinkie’s sexual antics anymore.”

“You’re telling me? If I had known this was gonna happen, I wouldn’t have done it. By the way, any idea when this is going to stop?” Rainbow asked pointing to her crotch. Her belly had now mostly returned to normal, but between her legs were two party balloon sized breasts with an erect two inch long nipple standing off each one.

“They should deflate on their own now that you’re done, but it may take a few days.”

Rainbow groaned, “ A few days?! I’m gonna be the laughing stock of ponyville! Can you do me a solid and see if Rarity has a dress that might hide these things?”

“Sure, but whatever you do, don’t rub, bump, or mess with them too much. If you do, they’ll react by making more helium. They’ll swell until they think they’re not being used.” Twilight informed her.

“Yeah I got it, don’t touch, it's not me you have to worry about touching them, it's her.” Rainbow said pointing an accusatory hoof.

Off in the corner of the room, Pinkie Pie bobbed and hummed lazily to herself. Filled with helium and almost as large as Rainbow was at her largest size, the pink pony didn’t seem to have a care in the world as she shared the ceiling with the countless other balloons bobbing nearby.

Twilight sighed, “Yeah, she should deflate on her own eventually. Anyway, I'll go see if Rarity has a dress or something for you to wear.” The unicorn said headed for the door.

“Thanks Twilight.” Rainbow said. As the door closed leaving the Pegasus with the delusional helium filled pony, Rainbow tried to think of how she could get back at her when her hoof brushed her swollen breasts. she shuddered as she felt them grow just a tiny bit. With a devious thought in her mind, she turned to Pinkie and put on an innocent smile.

“Hey Pinkie, how would you like to get REALLY big?”

Author's Note

Ta-daaaaa.... this is a weird one. hope you enjoyed it though.