Fabulous in Blue

by The Irish Brony

Rating: mature
Tags: Sex, My Little Pony: Friendship is Magic, Alternate Universe, Human, Romance, Original Character, Porn, Fetish, Rainbow Dash, Profanity
Length: 5034

Dash asks an old friend to make a potion so she can look like other mares and impress her human friend.

Rainbow Dash and her human love Ivan have been together for a few years now. But Dash has noticed Ivan while loving her with all his heart, still can't seem to keep his eyes off the other mares with bigger rumps than hers. She gets an idea and asks an old friend to make a potion for her to drink so she can look like other mares. She then invites Ivan over for some fun.

Sex: Growth, big butt, macro, dildo, mare on human, human on mare, sitting on face, and just for fun real horse sounds.

Published 2022-07-19 15:40:00 UTC
Last updated 2022-07-19 15:40:00 UTC

Fabulous Change

Dash taps her hoof against the cloud couch impacently0. She looks up at the clock ticking away on her wall. The seconds fall away to minutes as her impatience escalates slowly.

"Where is he?" She thinks as her ears twitch, listening for the knock at the door. Her eyes darting around the room as her head slowly looks around. She sighs in anger as her impatience turns into anger. Her anger boils slowly over the few seconds before the door finally rings out a loud knock.

"Finally," She whispers angrily as she zips over to the door in a prism of rainbow light. She opens the door to be treated at her doorstep by a, slightly shorter than her, red unicorn stallion. The stallion's red fur was cut up by blue zebra patterns. His bright red and blue hair spiked up like Spitfire's. Breaking his mane up is a bent horn sitting on top of his head. Wrapped around his horn is a black collar with a blue crystal embedded into it. His orange eyes almost glowing in the sunlight with a big smile plastered on his face. On his rump is an orange flask bubble over as his cutie mark.

"Sorry for the slight hold up," He says as his horn lights up. The crystal on his horn glows blue as his horn glows orange. He pulls a flask off his back with red liquid inside. "You would be surprised how much traffic there is from Canterlot to here with a hot air balloon,"

"Did you get me what I asked for Flask?"

"Yep, even got you instructions on how much to drink a day," Flask says, pulling from out of his hair a sheet of folded-up paper as Dash grabs the flask from his magical grip. "It will also instruct you on the safest way to use it,"

"Thanks," Dash says with a slight smile on her face. She grabs the paper from him before placing both on the little table at the entrance of her house.

"One question," Flask asks as Dash closes the door. She looks at him with slight confusion. "Why not ask Zecora?"

"I did," Dash responded.

"What did she say?"

Dash scratches her chin as she thought back to a few weeks ago to the interaction. "She said it would be dangerous with how she makes potions, or something like that," Dash says, waving her hoof in the air carelessly.

"That does make sense," Flask mumbles to himself. "She is a more.. organic chemist," Flask thinks to himself as he walks back to his hot air balloon.

"See you later!" Dash yells and waves.

"Make sure to follow the instructions to the letter!" Flask yells back before he steps into the hot air balloon. Dash closes the door slowly as she turns to look at the paper and flask on the little table. She grabs the paper and unfolds it to reveal a small list of things to take note of. She starts reading it as she mindlessly uncorks the flask.

"Take a few sips a day for a week," Dash reads aloud. "I think I can do that," She says before taking a sip from the flask. She quickly places the flask and paper down and gags. Her stomick lurching at the horrendous taste. She sticks out her tongue as she holds her stomick.

"He could have at least made that last better," Dash chocks out as she tries not to throw up onto the ground. Her stomick churned as it absorbed the liquid into her body. The stomick acid slowly subsides as a new feeling runs through her body. Her cheeks turn a light red as a tingling sensation develops in between her legs. She rubs her thighs together, letting out a little moan of pleaser slip threw her lips as her face turns bright red.

"O-oh f-f-fu-uck.." Dash stutters as her entire body starts to warm up. Her tongue falls out of her mouth as her breaths start to deepen. A smile forms on her face as her rump starts to grow. Her skin stretched as the pleasant feeling of her warm rump growing shoots pleasure down her body like nothing she had ever felt before.

The feeling quickly faded as her rump stops growing. Her rump is not much bigger than when it started. Her wings now unfurled slightly as her face turns into a pout before she thinks grumpily. "Why did it have to end so soon," She shakes her body like a dog, feeling her slightly bigger rump jiggle a bit. She turns to walk away from the flask, but she stops. Something just draws her back to it. She slowly turns around and walks back over to it. "Another sip couldn't hurt,"

She takes another drink from the red liquid. It slides down her throat as she once again gags on the liquid. She places the flask down as she smacks her lips together, trying to get rid of the taste. Her stomick churns in anger. Dash holds her mouth with a hoof as her stomick attempts to chuck the liquid out of her. She lurches before quickly dashing over to the sink.

She leans her head over the sink as she takes deep breaths. The feeling slowly subsides as warmth crawls back, but in slightly more intensity. Starting from her stomick, it crawls across her body in a much more deliberate way than the last time she had taken a drink. Dash's face turns from worry to pleasure.

Her cheeks turn red as her tongue falls out of her mouth again. Her eyes roll up into the back of her head as she lets out a little moan. Her slit leaking out cum down her leg as her hoof slowly drifts down to her nethers. Her body slowly started to grow. Slowly she started to grow taller as her rump became thicker. Her cutie mark starting to stretch over her bigger rump. Dash's hoof slowly rubs her clit, causing her to shake in pleasure as another low moan slips from her lips. The warmth once again subsides and so does the pleasure. She pouts in anger as her hoof falls away from her nethers.

"Damit!" She yells as she flies back over to the flask. Her wings a bit stiff from the last round. "Why must that not last that long," Dash says as she rereads over the list she was given. "Don't drink too much a day, or else strange things might happen," She whispers to herself as she reads over the warnings. Her hoof again slowly slithered down her stomick to her dripping wet slit.

"Dam, this is just as long as any of Twilight's warnings," She says as she finishes the paper. Her hoof now rubbing her slit without thinking. "Bbbuuuutttt.." She stretches out the word as she eyes the flask with a mischievous smile. "It didn't say how much was too much,"

Dash grabs the flask and flies up to her room in a flash of rainbow color. She closes the door and shuts the curtains. She sits down on her bed with the flask in between her thighs. With a big grin on her face, she throws her head back and gulps down two big mouth fulls of the bitter liquid. She places it on the stand quickly as her body starts to scream out in pain.

"Ooohhhh..." Dash says, holding her stomick as it churns in anger. "Maybe not a good idea," Dash says as her body jolts forward, trying to throw up the liquid. She covers her mouth as she tries to keep down the liquid. Her body groans in pain as the warm, pleasant feeling starts to form in her body again. Her eyes roll up into the back of her head as she lowers her hoof. She lets out a moan of pleaser as her hoof glides down her stomick and to her slit.

She falls backward onto her bed as she slowly slides her hoof along her slit. She lets out periodic moans as her entire body starts to be filled with pleasure. She laid there for a few seconds in bliss before a new feeling formed on her head. She freezes as she figures out the new feeling. It felt like her hair was growing. She zoomed over to the mirror to see what was happing to her body.

She looked to her slight horror and a weird feeling of joy, to see her hair had grown out much longer than she normally kept it. Her prismatic hair was now down to her knees. She looks over it as she brushes her hoof through it. She was on the fence about her new hair. On one hoof, she still had that rugged tomboy look she liked, on the other hoof, it made her look more like a mare ready to be pounded by the hottest station in equestrian.

Before she can think it threw, she lets out a loud moan. She watches with a smile as her rump grows bigger. She slides her hoof down her back and to her growing rump. She pushes against the new, squishy padding. She lets out a little moan from the touch. Her rump pushing back and morphing around her hoof,

"F-f-fuck," Dash says as her eyes roll into her head. Her hoof rubs her rump as it grows. Pushing into her rump and massaging it, causing lightning-like feelings of pleasure to shoot threw her body. Her rump now much bigger than what her normal, athlete rump, ever was. The warmth slowly drifts away, but Dash's lust stays as her mind starts to wonder.

"Ya Ivan, you like that?" Dash asks her human friend, who was not there at the moment making her look crazy. Dash smacks her ass, causing it to jiggle a bit from the impact. She lets out a light moan in response. "I see my new rump has caught someone's attention."

Dash walks over to the dresser and pulls the bottom drawer open. She digs threw it before pulling out a moderet-sized dildo from the bottom of the drawer. "I see someone is happy to see me," She coos seductively as she rubs the dildo against her face. "Maybe I could help with that,"

Dash walks over to her bed. She grabs the flask and takes another chug from it before setting it back down. She shivers as the bitter liquid runs down her body. Her stomick has now given up on trying to stop the invasive magic. Dash gets up onto the bed and lays down on her back with her legs spread.

She pocks the end of the dildo against the opening of her slit. This causes her to shake in response. "J-just shove it in," Dash grunts as she slides the entirety of the dildo into her all at once. The feeling of her inside filling up causes pleasure to shoot up her body. She shakes as her other hoof grips the bed like a vise.

"Uuhh!" She lets out as her body is filled with warmth. Her face turns bright red as she starts slowly sliding the dildo in and out of herself. Her breathing becomes more erratic as the potion takes effect. Her body starts to grow taller as her hair grows a bit longer. Her rump grew bigger with every slow thrust of the dildo into her. Her rump jiggled in response to the hits. She starts massaging her rump with her other hoof, pushing against her growing rump. She lets out moans of pleasure as her body shakes uncontrollably. She starts to speed up her thrust with the dildo.

"Faster Ivan!" Dash says as she continues to speed up the thrusts of the dildo into her growing body. Her rump slowly grew bigger and bigger. She was slowly becoming too big for the bed. She smacks her rump, causing it to jiggle as she moans loudly. She pushes the dildo all the way into her as she thrusts toward it. Her hips spasm as she lets out loads of cum all over her bed and ground.

After a bit of thrusting, she finally calms down. Dash pulls the dildo out of her and lets it fall to the ground. She slows down her breathing before sitting up. She looks down at her body to see she had grown much bigger. She looks back at her rump to see its squishy mass spread out on the bed. It was almost five times the size of her normal rump. A smile forms on her face slowly as a sexy idea forms in her head.

In Bright Blue

Standing below Rainbow Dash's house is a tall, lightly toned, and thin white male human. His dark brown eyes were almost the complete opposite of the mess of red hair on his head. He wears blue jeans, a gray shirt with Soarin's cutie mark in the center of dark clouds, and a dark black watch.

He stands there and looks up at his mare friend's house floating in the sky. She had invited him to come over for a surprise. He can't decide if he should be worried about her or the surprise more. He looks over to the nearby tree to see balloons tied to a tree branch. Left there by Pinkie Pie so non-pegasus can get to her house.

Ivan walks over and unties the balloons and holds onto them. He looks down at the crystal around his neck that Twilight gave him so he could walk on clouds when he wanted to. He taps it, causing light purple magic to form around him before becoming light enough to start floating up. He holds onto the string of the balloons tight as his feet leave the ground.

He looks up at the house so as not to cause him to freak out from how high he was. The cloud house fast approaches him. He grabs onto the clouds, his hand pushing into the soft cloud ever so slightly before the clouds push back. He pulls himself up onto the cloud before standing up. He ties the balloons to Dash's mailbox before walking towards the door.

He stops at the light blue door and looks at it for a few seconds in thought. He raises his hand to the door and knocks firmly against the door. He flinches when he hears a loud thud of a pony falling, or running into the ground.

"Give me a sec!" Dash yells from inside, slightly muffled for some reason. "Fuck," She says as another loud thud is heard.

"You ok?!" Ivan asks right before the door opens. His jaw drops as his face turns a bright red. His heart skyrockets as his breath momentarily stops in his throat. His eyes slightly widen in surprise as they soak in the sight.

Standing in front of him, leaning against the door frame nonchalantly, is Rainbow Dash, but much bigger than when he saw her last. She was now standing at six feet tall, just above his height. Her confident, but sexy smile and half-lided eyes could not distract him from the most notable things. Her hair was a mess, probably from running into things, and was past her knees. Her cutie marks now easily visible from the front due to how big her rump had gotten. It was like a giant beach ball in size. Her wings were almost just as big as her body and draped down in a relaxed pose.

"W-what happened to you?" Ivan stutters out, his face bright red as his eyes scan over the bigger and more beautiful Rainbow Dash.

"What do you mean?" Dash asks with a knowing smirk on her face.

"You're not only bigger but somehow simultaneously beautiful and rugged at the same time," Ivan responds, still stunned as he keeps looking her over.

"Oh, that," Dash says, looking back at her own body with sarcastic surprise as she folds her wings back up and stands up straight. "You like it?" Dash asks as she turns around, flicking her tail before walking back into her house. Ivan stands there in shock as he watches her hug ass slightly jiggle with each step. He shakes his head before walking in and closing the door.

"What happened?"

"I drank a potion," Dash says, turning around to face him.

"Oh.." Ivan responds. "I was not expecting it to be that straightforward,"

"Of course it is," Dash says, rolling her eyes. "I did it for you,"

"For me?" Ivan asks in genuine confusion.

"Ya, I know how you look at other mares," Dash says, causing Ivan to look away in shame. "I know you love me, but I can tell deep inside your primal side still wants the bigger size other mares can provide,"

"Dash.." Ivan is interrupted when Dash grabs his neck and pushes into his lips with hers. Ivan closes his eyes as he sighs into her mouth. He glides his hands behind her head as he returns the kiss. His fingers combed threw her long hair. His chest rests against hers as the two stay locked together in a loving kiss for minutes.

"Dash.." Ivan says as he separates from her lips, nuzzling his cheek against hers. "You really didn't have to do that," Ivan says with slight worry in his voice as he slides his hands down her neck. "Is it permanent?"

"No, it will go away after a few months," Dash says, pulling away from him and looking into his eyes. Dash smiles at him, and not being able to resist her, he smiles back at her.

"I guess as long as it's not permanent," Ivan starts as the smile on Dash's face grows. "We could have some fun with this,"

"Yes," Dash squeaks in glee as she turns around, hitting Ivan with her rump. His breath leaves him when the squishy flesh hits him. He stumbles back and falls down to the ground with a thump.

"Watch where you turn," Ivan says, rubbing his head. Dash looks back at him on the ground with slight worry on her face before a smile forms on her face. She sits down on top of his lower body, causing Ivan to grunt in slight discomfort. Her rump basically swallowing his lower body into its soft, squishy skin.

"Ops," Dash says, covering her mouth. "I didn't see you there,"

Ivan chuckles before responding, "Ok, ok, you've had your fun, now get off." He pushes her rump with his hands. He only succeeds in causing Dash to moan as his hands sink into her rump. He slumps back to the ground as Dash turns to look at him with a grin.

"Someone is getting a little handsy with my rump down there,"

"Oh fuck off!" Ivan yells with a smile.

"I'll fuck you with that attitude," Dash responds back as she rubs her rump along his stomick and legs. Ivan bits his lower lip as he scraps his fingers against the soft ground. His pants quickly got tighter from the godess-like rump on his stomick. His heart rate skyrockets as he tries to speak between gasps of air.

"Might as well," He finally croaks out. Dash stops her rubbing as she looks back at him. She chuckles as she slowly and methodically rubs her rump against the bulge in his pants.

"You would like that, wouldn't you?" Dash says, pushing more of her weight onto him. Ivan doesn't respond back, instead, he grabs her rump with both hands and squeezes them. His hands sink into her soft flesh a bit. Dash lets out a happy moan as her body lightly shakes with pleasure. Her slit dripping mare cum onto his crotch. Ivan gently glides his hands over her rump, causing her to shiver as his hands glide up to her wings. His hands reach to the base of her wings before massaging her wings. "Fuck!" Dash yells in pleasure as her wings flare out, smacking Ivan's hands. He shakes it off and goes back to tenderly massaging the base of her wings.

Dash slowly and mindlessly starts rubbing her rump against his bulge again. Ivan's face slowly turns red as he holds back grunts of pleasure. His attention being drawn back to her rump, he slides his hands slowly back down her back. This causes Dash to let out a small moan as her body shivers from his touch. He eventually grabs her hip and helps her out. Dash lets out a slight yelp in surprise before looking down at him with a smile.

"I see you like it," Dash remarks. Ivan looks up at her and smiles before gripping her rump hard in his hands. Dash's face turns bright red as she lets out the girliest moan she would never admit to. She takes a few breaths before replying to his reaction. "I guess that's a yes," Dash pauses for a second as she stops her rubbing. "Then you should get a closer look," Dash, in one quick movement, stands up and sits down on top of Ivan's face. Her rump surrounds his entire head.

A muffled sound of surprise can be heard from Ivan before he grabs onto her rump again. Sinking his hands into her soft rump. Dash lets out a happy grunt as his fingers lightly massage her rump.

"Having fun down there?" Dash asks, pushing her rump harder against his face. He doesn't respond, Dash fearing the worst had happened, goes to get up, but is stopped when a wet and warm thing slides into her slit. Ivan was using his tongue to massage the walls of her insides. Dash relaxes again as a few squeaks and moans slip out of her mouth. She looks down at his buldge as an idea comes into her head. "You can't have all the fun,"

Dash leans over, pushing his face deeper into her rump as she undoes his pants. She slides them and his boxers down before Ivan kicks them off. She sits up and looks down at, the now small in comparison to her rump, dick standing in front of her. Dash smiles before wrapping a hoof around his dick and placing it against her chest. Ivan's muffled groan of pleasure reaches her ears. She smiles as she slowly rubs his dick with her hoof. Ivan grips down onto Dash's rump harder as his hips buck up. Dash lets out a grunt of pleasure from the sudden grope.

Dash starts grinding her hips against Ivan's face. She lets out a moan as Ivna's hands sink deeper into her rump. She looks down at his dick with a smile before quickly taking it into her mouth in one motion. Ivan let out a loud moan as his hips instinctively thrust up into Dash's mouth. She starts bobbing up and down on his dick as she simultaneously grinds her rump against his face. Ivan lets out a moan as he sinks his hands into her giant cutie marks. Dash lets out a moan as a building pressure starts to fill in her nethers. She speeds up her grinding and bobing, causing Ivan to let out a moan as he also speeds up his licking. Dash lets out a loud moan that vibrates his dick. She slams her rump onto his face as she lets out her cum. Ivan thrust a few more times into her mouth before grunting as he to lets his cum into her. She smiles before sucking up every drop of his human seed. She pulls off before licking her lips and standing up. She steps off of him to see him laying in a puddel of her cum with a goffy smile on his face.

"If you thought that was great, get ready for round two," Dash says, turning and heading for the stairs as she sways her rump. Ivan sits up and shakes his head clear. He stands up and fallows Dash up the stairs. "Now that you are warmed up, you think you can handle this mare's massive rump?" Dash asks as the two make it to the top of the stairs.

"We'll find out," Ivan replies, slapping Dash's massive rump, causing it to jiggle. This action causes her to instictavly push off the ground onto her hind legs and let out a whinny. Her face turns bright red as she lands back down on the ground. Ivan holds a hand over his mouth as he tries to suppress his laughter.

"Lagh it up hot shot," She shoots back in embarsment before bumping her hip against his, causing him to stumble a bit before recovering. The two walk into Dash's room while Ivan slowly recovers from his slight giggle fit.

The room was huge and open. In the center was the big cloud bed with the Wonder Bolt's logo on it. To the right of the bed is a little nightstand with a few books on it near a window. To the far right against the wall is a bookshelf and next to it is a dresser. On the far left is a door to the bathroom.

"It's clean this time," Ivan comments as Dash walks over to the bed. She rolls her eyes as she turns towards Ivan.

"So you up for round two?" Dash asks, raising an eyebrow with a lustful smile.

"What do you think?" Ivan asks, pointing at his already hard dick.

"Looks like someone needs to let off some pressure," Dash says as she cimes onto the bed, letting her hind legs lay limply off the bed while she displays her slit proudly to him. Ivan lets out a chuckle as he walks over to Dash.

"Looks like someone wants it bad," Ivan says, trailing his finger around her slit. Dash shivers as her eyes lightly roll into her head. Ivan smiles as he uses his other hand to grab her rump. She squeaks in surprise before moaning. Ivan slides two fingers into her as her slit clamps down on his fingers. He massages just inside her slit as his other hand massages her rump.

"F-fuck.." Dash lets out in pleasure as Ivan keeps up the pressure. Her slit dripping out cum as Ivan pulls his fingers out. Dash rests her head on the bed as she recovers.

"There, now you are ready," Ivan says as he steps behind Dash's giant rump. He grabs her rump with both hands as he pokes the entrance of her slit with the tip of his dick. Ivan gently massages the soft, squishy cheeks in his hand. Dash pushes back to try and get his dick into her. She fails as Ivan pulls completely away. "Impatient are we?"

"Just put it in!" Dash yells in anger. "What else do you nee?!" Dash is cut short when Ivan thrust his entire dick into her. She lets out a moan as she grabs the bed with her hooves. Her wings spread out stiff the moment his hips hit her rump. Her face turns red as she bits her lower lip. Ivan smiles, now hip deep into Dash with his hips surrounded by her soft rump. Both of their hearts beat fast in excitement and pleasure.

Ivan lets out a grunt as Dash's slit grips down on him like a vice. Ivan's face turns red as he pushes his hands into her cutie mark. Dash lets out a moan as Ivan slowly pulls out. A smile forms on his face as an idea comes to mind. He thrusts into her as he slaps her rump. Her rump jiggled from the impact of both his hips and his hand.

Dash lets out a moan and lets slip a whinny. She shuts her mouth quickly as her face heats up from embarrassment. Ivan lets out a little lagh as he pulls out. He grips her rump tightly between his hands as he prepares himself. He thrust into her. As his hips hit her rump, her rump jiggled in response. Dash lets out a moan as her tongue falls out of her mouth. Her hoofs pawing at the bed and her tail wagging like a happy dog.

Ivan trails his hands to the sides of her hips as he pulls out again. He feels around till he feels a curten tight muscle. He smiles as he pushes himself back into her. His hands digging into her hip, causing Dash to let out another girly scream of pleasure as her entire body shakes a bit. Little squeaks of pleasure slip from her throat as Ivan pulls back out. He massages the muscles as he thrust again. Dash's body squirms under his hands as Dash moans from all the pleasure.

Ivan slides his hands down her body, causing Dash to shiver as he leans over her rump. His stomick comes into contact with her rump and slightly comprising it. Ivan grabs the base of her wings, causing them to twitch a bit. He starts rubbing them as he starts thrusting into Dash at a constant rate. Dash shivers and moans as pleasure fills her body. Her body shakes as Ivan massages her wings.

"Ya ready?" Ivan asks as the familiar build up starts. Dash can only nod in her sensory overloaded state. Ivan thrust faster into her as he starts giving Dash a wing job. Dash lets out the highest pitch moan he has ever heard come out of her mouth. Her eyes roll up into her head as her tongue slid out as the entire bed shakes from his thrusts. Ivan keeps up the speed as the pleaser build in his groin. "Dash, it's," Ivan can't finish as he thrust into her, releasing his seed into her. Dash shivers as his cum slide into her. Ivan thrust a few more times before stopping.

Ivan rests his head on Dash's back as her wings flop against the bed. The two breathing heavily from what just happened. Dash sits up and looks back at the human on her back. Ivan looks up at her with a smile.

"Round three?" Dash asks.