Growing Up

by The Irish Brony

Rating: mature
Tags: Profanity, Scootaloo, Alternate Universe, Human, My Little Pony: Friendship is Magic, Romance, Porn, Sex, Fetish
Length: 2380

Scootaloo and her human colt friend Colt have found a way to spice up there sex life. A collar that can grow the wearer when a word is said.

Scootaloo and her human colt friend... Colt... now his name sounds stupid. Anyway, Scootaloo has found a way to spice up their sex life with a Collar created by Acid Flask after the events of Celestial Growth. The collar allows the user to set a trigger word, and when it's said, the user's sex organs and body grow bigger.

Story includes: Older Scootalo, sex, mare on human, human on mare, micro on macro, and dick sandwiched by big butt cheeks.

Published 2021-12-24 01:30:01 UTC
Last updated 2021-12-24 01:30:01 UTC

Scootaloo Growing Up

"It was just right here?" Scootaloo says in slight distress as she looks around her desk. Colt, a human male, lies on her bed watching her look frantically around her room. Colt is white with blue eyes and red mixed with brown hair. His hair is a mop tangled with its self. He wears a blue shirt with the wonder bolts logo on it. His legs are crossed as his sweatpants titan around his crotch. "Sorry for the inconvenience,"

"No problem," Colt replies as Scootaloo bends over to look through her saddlebags. Her toned but slightly plumed rump sticks in their air. Her tail partly brushes away to give Colt a peek of what's between those gorges cheeks. Colt smiles as he shifts himself to get more comfortable, as his pants get tighter.

"Here it is!" Scootaloo yells excitedly, popping up from the saddlebag. She turns around and shows a black collar with blue, almost computer-like lines running through and into a single blue ball at the front. Colt looks slightly shocked at the object in her hoof.

"Scootaloo," Colt starts calmly as he sits up. "How did you manage to afford that?"

"The entire CMC chipped in to by it," Scootaloo says, sitting down as she starts to put it on. "We are sharing it, so it was my turn to get it for the week,"

"Does it even work?" Colt asks as Scootaloo titans the collar.

"Yes, it does." Scootaloo hesitates as she looks up at the ceiling while lowering her hoofs to the ground. "Sweetie Bell tried it out and said it worked at least."

"So how does it work?" Colt asks, uncrossing his legs as Scootaloo hops onto the bed. She gives him a smirk as she steps over him. She plaints a kiss right on his lips. He replies by pushing into her and wrapping his arms around her neck. The two break from their kiss.

"Like this," Scootaloo turns the blue ball slightly to the right. Colt sees there are numbers around the ball, ranging from 0 to 20. She turns it to 1 before speaking again. "Marshmello." Colt smiled and scoffed at the word before realise the device was working.

Scootaloo was engulfed by a blue magic aura. Her eyes roll into the back of her head as the magic makes its way down to her plot. Colt watches as her butt slowly plumps up a few inches bigger than her normally already sexy plot. The magic stops as Scootaloo regains control. She looks back at her bigger and better plot. She shakes it a bit to see it giggle slightly.

"Do you like it?" Scootaloo asks, looking down at Colt with a smile. Colt looks back and gives her a kiss on the lips. The two stay like that as Colt runs his hands down her back slowly. He goes past her slowly straitening wings and right to her plot. He grabs her butt and pushes her cheeks together. His fingers sink slightly into her plot as Scootaloo moans into his mouth. Colt massages her plump cheeks as he feels a liquid hit his leg. He chuckles into her mouth before pulling away and laying his head on the pillow.

"Looks like someone got excited quickly," Colt says jokingly. Scootaloo grins back at him as she backs up. His hands slip off of her plot as she sits down between his legs.

"You've been excited the moment you got in here," She says right before attempting to take off his pants. Colt slides off his shirt as Scootaloo grunts in frustration. She finally gets a good grip on his paints as Colt throws his shirt to the ground beside the bed. She slides his paints off just to be denied by boxers. "Damit," Scootaloo whispers before bitting down on the fabric and taking off both his paints and his boxer and throwing it to the ground.

Colt shivers as his dick points straight up into the cold air of winter. Scootaloo licks her lips before her face turns into one of an idea. She turns around and slides his dick in between her two plump cheeks. He shivers and lets out a sigh of pleaser. "Marshmallow," Scootaloo says before the magic returns. She moans loudly as her plot grows bigger. He butt swallows his dick into her buffy butt. Colt grunts in pleaser at her soft plot slides around his dick. "Like it back there?" She asks, turning back to look at him.

Colt catches his breath before answering. "Ya, your butt is like a marshmallow." The two make eye contact and smile at each other before the magic takes hold of Scootaloo. Her eyes roll to the back of her head as her tongue falls out and a cute high-pitched moan escapes her lips. Her butt slowly grows again, now starting to put pressure on Colt's dick witch is sandwiched in between her big butt cheeks.

Colt shivers in pleaser as he slowly thrusts up and down the still growing ass. Scootaloo moans in response as she feels his cock brush against her slit. Her plot finally stops growing as she gains control over her body again.

"I know you like the view," Scootaloo says, standing up. Colt lets out a low grunt of disapproval before his eyes catch her giant ass. Her plot giggles slightly when she stands up. Her slit is barely visible through her plush plot. Scootaloo looks back at him and smiles before walking back words and sitting on his chest. Her rump giggled from the impact as it squished.

Colt carefully and gently squeezes Scootaloos new plush plot. He messages it, sinking his fingers into her soft skin. She moans in delight as liquid starts to stain Colt's chest from her slit. "Looks like someone else enjoys having a big butt." Scootaloo lets out a happy giggle before looking down at Colt's dick. She licks her lips and plunges his dick into her mouth in one big gulp. This causes Colt to moan and for Scootaloo to gage. She pulls all the way out and coughs to clear her through.

"Is it to big for you?" Colt asks, tracing his finger around her dripping wet slit. Scootaloo shivers in pleaser before responding.

"No, I was just taking it for a test run." She then promptly takes the end of his dick into her mouth and slowly pushes her head down. Colt moans in pleaser as he slides two fingers into her slit. He does his best to massage her insides, as well as her new plot with his other hand. His efforts were rewarded with a happy moan right as Scootaloo got to his base. Colt shivers in pleaser from the vibrations of her moan.

Scootaloo smiles and places her tongue onto his dick. She then slid up to the tip and thrusts hardback down, all the while licking his dick as best as she could. Colt loses concentration from the sensations of her warm tongue sliding up and down his shaft. He then gets an idea. He slides his finger out and pulls her closer to his head. She squeaks in surprise, she pulls out and looks back at him

Colt smiles at Scootaloo before shoving his face into her plot. Scootaloo shivers in pleaser as Colt starts licking and sucking on her pussy. He massages her plot with his fingers. Scootaloo melts at his touch.

"You like my marshmallow plot?" Scootaloo asks, feeling the magic come back. She lets out a loud moan as her plot starts to grow again. Colt's face now firmly bared into her plot. This just makes Colt speed up his licking. He squishes her plot together and into his face. Scootaloo recovers as the magic stops.

"So that's how it's going to be?" Scootaloo thinks before going back to sucking on Colt's dick. Colt moans and thrusts his hips up instinctively.

They are interlocked like this for minutes. Colt squeezes Scoot's plot as he sucks and licks her clit. Scootaloo moans with every lick as she bobs up and down on his dick. Colt shivers and moans, feeling the vibration of Scootaloo's moans. Colt's back arches up as he thrust his hips up into her mouth.

"Can't...holt.." Colt thinks as he tries to focus on Scootalo's slit.

"Come on.." Scootaloo thinks as she speeds up. Her wings straight out and her back arched as her hips try and push themselves into Colt's face. "Just a little more.."

"Shit!" The two think at the same time. Scootaloo lets out a loud moan as she melts onto Colt's body as her hips spasm. Her moan vibrates Colt's dick, almost tipping him over the edge. Only a few strands of pre-cum spasm out. Warm liquid covers Colt's face with every thrust. Colt tries to pull away before he drowns in her cum. Her cum spills out onto his chest as Scootaloo pulls off of his dick lazily, placing her head against his thigh.

Colt chuckles before speaking. "Looks like I won,"

"Only because of those wonderful hands." Colt squeezes her plot lovingly in response. Scootaloo lets out a tiered moan of pleaser.

"Looks like my little marshmallow is tiered," Colt says with a devilish smile. Scootaloo moans and shivers as the magic takes hold again. Scootaloo's eyes snap wide open when she feels something different. Her hair stands on end as a sizzling sound comes from the collar. Colt hears the sound of electricity right before he rolls Scootaloo off of him with ease. The collar sparks and screams in pain as the magic flows over Scootaloo's body. The blue light of the magic is more intense than ever. Colt stands up and watches his mare on the bed as her entire body starts to grow.

Scootaloo's emotions are very confused. She loves the pleaser that flows over her, but the growth was also hurting her. She almost doubles in size before she stops growing. Scootalo relaxes onto the bed, her tongue out of her mouth and her eyes slightly lidded and her eyes rolled back in pleaser. Her plot stuck up in the air, almost twice the size of her own body.

"Are you ok?" Colt says worryingly. He runs over to her and wraps his arms around her body. She looks up at him and pulls her tongue back into her mouth.

"That was not supposed to happen," Scootaloo says, still in a haze of pleaser. Colt looks over Scootaloo's new body. Her plot was the most obvious change, but her wings are bigger and she even seems to be more toned then before. Colt's eyes drift to her giant plot sticking in the air. He places his hand on her cutie mark, which is the size of his hand. He gently pushes in, causing his hand to sink into the soft skin. Scootaloo grunts in pleaser from his touch.

"You look tired, how about I take it from here," Colt says, wrapping his arms around her butt as best as he could. He pulls her butt over the edge of the bed so he can reach her better. She shivers at him hugging her massive plot. Colt steps behind Scootaloo, her plot was wider than his entire body.

Colt smirks and thinks, "This is going to be fun," before moving her tail out of the way and aiming his dick at her dripping wet slit. He slowly pushes into her surprisingly tight pussy. Scootaloo moans in pleaser from his entry. He gets as far as he can, but her plump rump stops him. His hips are buried in three to four inches of Scootabutt.

Colt slowly runs his hands down her plot, causing Scootaloo to shiver in bliss. He cups her cutie marks in his hands before asking, "You ready my big marshmallow?" Scootaloo is unable to respond as the magic takes over her body again. Colt pulls out and violently thrusts back in as fast as he can, causing Scootaloo and her plot to giggle with the force. Her plot grows with every thrust he does till it finally stops at about twice its original size.

Colt does his best to reach around to Scoot's upper body and grabs hold. Scootaloo lets out a light squeak before going back to enjoying the pleaser of his dick inside of her. He thrust harder and faster, comprising her plot into her back. She moans from the sudden speed up. Colt grunts in pleaser as it starts to build up inside of him again.

"Scootaloo, I'm gonna.." Before he can respond he thrust one last time into her plot and lays his head onto her back as he releases cum inside of her. Scootaloo moans as she feels the warm liquid hit her insides. Colt does a couple of more thrusts into her plot to make sure he was empty.

The two lay there for a few minutes before Colt pulls out and lays next to Scootaloo on the bed. "That was amazing," the two say at the same time. They look at each other and smile.

"Not to complain, but I think we better clean up and return you back to your normal size," Colt says, stretching his arms up as he sits up. Scootaloo sighs as she looks back at her rump one last time.

"Mallowmarsh," Scootaloo says. Colt places his hand on her back as she starts to shrink back to normal. Scootaloo grunts and lets out little screams of pain. Colt does his best to comfort her as she returns back to her normal size of just below normal mare height.

When she was done shrinking, Colt places a loving kiss on her normal size butt. "I don't care what size you are. I will always love you,"

Scootaloo blushes before standing up and declaring boldly. "Now let's clean this mess up!"

Author's Note

Honestly, out of all the books in the Christmas Bundle, click the link for more details about it if you care, this was the one that definitely just need to be published.

I had this one on the back burner for months now and it's good to get it out finally. I hope you enjoyed this book.