Dash's Decision

by Rinpoo

Rating: mature
Tags: Fetish, Profanity, Sex, Twilight Sparkle, Anthro, My Little Pony: Friendship is Magic, Alternate Universe, Rainbow Dash, Romance, Original Character, Porn
Length: 3799

Rainbow Dash decides she wants massive breasts, so she goes to Twilight for help with her boyfriend.

Rainbow Dash decides she wants massive breasts because her boyfriend, Green Thunder (https://www.fimfiction.net/user/3527/blaa6) loves an enormous bust, and her friends all have bigger breasts than she does.

She enlists the help of Twilight to make her chest larger, but the transformation spell comes with some side effects that leave Rainbow Dash feeling "needy."

Published 2019-03-27 06:20:01 UTC
Last updated 2019-03-27 06:20:01 UTC

Dash's Decision

Author's Note

A paid commission for Blaa6 (https://www.fimfiction.net/user/3527/blaa6)

He requested I write a story about his character and Rainbow Dash, so I obliged and wrote everything he desired in this piece.

I am delighted with how this one turned out, so if you have a fetish for massive breasts and secks, you should enjoy this.

If you are interested in commissioning me for something, feel free to PM me if you desire.

Dash's Decision

Dash’s Decision.

“Are you sure you want to do this Dashie?” Green Thunder asked as he walked alongside the love of his life, Rainbow Dash.

Rainbow Dash looked at him and gave him a light smile as she crossed her arms in front of her small breasts. “Yeah, I’m sure. I just feel like I need to keep up with my friends. I also know how much you love giant boobs…” She said with a hint of self-consciousness.

Green Thunder raised an eyebrow and just shook his head. It was true, he adored massive tits, but the reality was, he loved Rainbow Dash for who she was and was worried that she might be forcing herself to do something that she might not want to. “Hey, Dash… It’s okay; you don't have to worry about what I like… because the best thing in my life is you.”

Rainbow Dash lifted her hand to push her luxuriously long hair out of her face and gave him an appreciative smile. “No, I really do want to do this. All of my friends have wonderfully sized busts, but I am just stuck with a flat chest."

Green Thunder nodded as he listened to his wonderful girlfriend speak her mind. He was excited over the prospect that the special somepony he loved was going to get a massive pair of knockers.

“Well, whatever you want to do, I will support you in.” Green Thunder smiled brightly, easing Rainbow Dash’s nerves.

"Thanks, G. T. I don't know what I would do without you." She said affectionately as she planted a small kiss on his cheek. Her hair that hung down to her feet blew in the gentle breeze of the spring day.

He blushed, and his heart started to race from the kiss. He took in a deep breath while turning to look up at the beautiful skies of Equestria, and felt like his life could only get better from here.

The two walked further through the town as they headed towards Twilight Sparkle’s treehouse. Rainbow Dash had contacted Twilight about her problem and Twilight told her to come over after she had located the perfect spell to deal with her “little” issue.

After about several minutes of walking, Green and Rainbow had reached Twilight’s regrown home. It looked just as good as it ever did and Rainbow was surprised to see Twilight eagerly awaiting her out front.

“Hey! Twilight!” Rainbow greeted her friend while picking up her pace.

Twilight just looked at the two approaching and smiled. “Ah, Rainbow Dash! You got here much quicker than I anticipated. I see that you are excited.” She finished her sentence with a cheeky grin.

Green walked up and smiled at Twilight. “Hey Twilight, how are you doing today? I really wanted to thank you for what you are doing for Dashie. It means a lot to her.”

Rainbow Dash blushed, feeling embarrassed over his outward doting. She leaned towards Green and whispered into his ear. “Shush… You’re embarrassing me… I have a reputation to keep ya’ know.”

Green Thunder just started to laugh as he found her embarrassment cute. Even Twilight began to giggle at the couple's antics. "It really is no trouble, Rainbow Dash is one of my best friends, and I would do anything to make her happy.”

Rainbow Dash crossed her arms and had a smirk on her face. “All right then, enough mushy stuff; let's get this started.” Rainbow Dash said, feeling a surge of excitement course through her.

Twilight smiled, turning away from the two and led them inside of her home. Once there, the three stood surrounded by her vast collection of books. Twilight picked one up from her table and held it up for Rainbow Dash and Green to see.

“This is a book of transformative spells that will allow me to alter Rainbow Dash’s appearance.” She informed them.

“Whoa! And it will be permanent, right?” Rainbow Dash asked as she stared at the brown leather-bound book.

"Of course, and since there is a wide range of spells in the book, I can reverse it if you find yourself dissatisfied," Twilight answered while she flipped through the pages of the book, looking for the exact spell she wanted to use.

There was a moment of silence, and Green found himself fantasizing about his darling girlfriend’s new breasts. The thought was exciting him in many more ways than one.

“Ah! Here we go… Yes, I see… It seems that the spell will take a little time to reach the size you desire. However, this shouldn’t be a problem, as it shan’t take more than an hour.” Twilight informed Rainbow Dash of the specifics.

"Well, what are you waiting for! I'm ready as I'll ever be!" Rainbow Dash roared with enthusiasm.

Green Thunder just stood there and watched as Twilight began to chant the incantation. Her magical horn started radiating potent energy which then attached itself to Rainbow Dash’s chest. After a few moments, the glowing began to subside, but there was no noticeable change in Rainbow Dash’s bust.

"There we go, the spell is cast. You should start noticing the effects shortly." Twilight nodded in approval to her own assessment.

Rainbow Dash placed her hands on her flat chest and started to rub her B cup breasts. “Well, I feel a little tingly, but they don’t feel any bigger at the moment.”

Green Thunder stared at her chest and didn’t see any noticeable difference either. He honestly felt a little disappointed, but Twilight said it might take up to an hour to reach its full effect.

Twilight turned and placed the book back on the table so that she could easily find it if it were needed again.

The three waited in Twilight's house for well over 10 minutes, and with each passing second, Dash could feel her chest getting heavier and heavier. She looked down and could now see that her breasts had expanded to that of a C cup. She was shocked that her bosom pressed tightly against her small bra, forcing her larger breasts together to create a really tight and well-defined cleavage.

“Oh my!” Twilight giggled as Rainbow Dash stared down at her own chest.

“I don’t believe it! It’s incredible!” Rainbow Dash shouted as she pressed her hands up against her fleshy mammaries.

Green Thunder’s jaw just dropped, and he couldn't believe what he was witnessing. His beloved Rainbow Dash’s chest had increased in size by a factor of four or five. He could see that they were even still expanding up to this point, as the massive tits struggled to free themselves from their clothed prison.

Twilight Sparkle smiled as she watched the scene unfold, her grin was almost devilish at this point, and she let out another giggle as Rainbow Dash started to look flustered and heated with each passing moment.

“Oh, I forgot to mention…” Twilight Sparkle began and then paused as the two other ponies looked at her. “The text did mention that there would be some side effects having to do with sensitivity and arousal.” She placed her hands in front of herself innocently.

“W-what?!” Rainbow and Green nearly yelled in unity.

Twilight was quiet for a moment but then answered with a nod. “I wouldn’t worry too much about it; it will subside after a while."

Both of the other ponies were stunned, and Rainbow Dash could feel a mixture of growing pleasure and increased pain from her tight top. She moved her hands down and removed the shirt, tossing it to the side before it would tear due to the expansion of her voluptuous chi chis.

Green blushed and placed his hands at his sides, feeling the erection in his pants starting to form. Her breasts had become so enormous compared to what they used to be, and he could see that her tiny bra was struggling not to burst against the sheer size of her chest.

“I-I gotta remove it!” Rainbow Dash declared loudly and started reaching behind her back so that she could undo her bra.

“Wait! Y-you’re going to take it off here, r-really!?” Green said full of embarrassment and was practically salivating at the prospect of her enormous hooters flopping out and bouncing around freely.

Rainbow Dash hesitated, but the spell, now roughly 30 minutes in, was only mildly slowing down at this point. The sound of a snap came, and then all of a sudden, her bra was sent flying across the room when the strap had torn.

Her incredible triple D breasts burst out and started to jiggle under the sheer force of their own weight. Her nipples were already erect due to the sensitivity component of the spell. Rainbow Dash placed her hands on her bouncing jugs to stop them from bouncing up and down.

“Oh geez!” Rainbow Dash said, her face a deep crimson. She placed her hands over her nipples as if attempting to hide her nudity from those in the room, but it did very little given the size of her breasts overall.

Green Thunder stared in silence, now visibly drooling as he watched Rainbow Dash try to hide her mountain-sized tatas. At this point in her transformation, she had the biggest cans he’d ever seen in his life, and her erect nipples were poking out in between her fingers in a desperate attempt to hide her shame.

Twilight Sparkle sat completely silent and watched the scene unfold as if studying it. She seemed rather pleased with the things that were occurring, but she just allowed Green and Rainbow to carry on as they saw fit.

“Oh-oh my gosh…Dashie… You look gorgeous! You look incredible!” Green said as he wiped a bit of the drool off his maw. Her titanic gazangas and her exceedingly beautiful long, flowing hair made her appear as a goddess without equal to his eyes.

Rainbow Dash could feel her body tingling, and her breasts became ever more sensitive the further they expanded in size. Her slit started to leak into her panties, and just the fact that Green was staring at her with such lecherous eyes made her feel even more aroused.

“Ah! Oh… Mmmm…” Rainbow Dash squirmed while she made cute noises.

Green Thunder breathed heavily feeling his heart race and his blood became hot. His thick member was pressing up against his pants as it did its own expansion in tandem with Dash’s increasing breast size.

Rainbow Dash took notice of her lover’s growing passion and walked over to him unable to control her urges. She grabbed onto him with her delicate hands and pressed her gargantuan K cup sized tits against his body. She started to kiss him on the lips, sliding her delicate tongue into his mouth. “Mmmmm-hmmm...” She moaned passionately.

Green could feel her breasts smashing up against his chest, her hard nipples poking his pecks. It was now at the 50-minute mark, and her transformation was almost complete, her chest was so massive that it was difficult to wrap his arms around her from the front.

"Oh man, this is wonderful," Green said to Rainbow Dash as he leaned in to kiss her again.

Rainbow accepted the kiss but quickly decided that kissing was not enough for her, and she started to slowly move her hand down to stroke his erect cock through his pants. He tried not to moan because he knew that Twilight was still in the room, but it seemed as if Rainbow didn’t care at all whether her friend saw or not.

Rainbow Dash broke the passionate kiss and wiped a bit of saliva that had strung from her mouth to his. “I think that you’re eager to test these out…” She said as she used her hands to hoist the bottoms of her breasts up and drop them so that they jiggled for his enjoyment.

Green was speechless as she began to tease him with her chest. She was coming on so strong that he almost felt like pushing her on the table and having his way with her right there. He looked over and could see Twilight watching them as they fell deeper into their passionate arousal.

“Oh… Um… Twilight, could you excuse us?” Green asked her politely without outright telling her that they wanted to go fuck each other’s brains out.

Twilight just smirked and nodded. “You can be on your way if you need to, it seems as if the spell was a great success.”

"Thanks, Twilight…” Rainbow said holding onto Green tightly.

Without any hesitation, Green teleported both himself and his darling Rainbow Dash to her room.

“I need you right now!” Green said, having used his magical power to move them to a private location.

"I can tell if you needed to teleport us all the way to my room…" She responded with a laugh.

Green Thunder laughed back as he ran his hands along her now fully formed and complete double K cup breasts; they felt so soft, jiggly, and enticing, he couldn't help but desire to put his head on them. It was as if they were two huge and sensual pillows explicitly made for him to enjoy.

Rainbow Dash giggled as she felt her breasts rubbed. It sent pleasurable chills up and down her spine, and her rainbow-colored tail started to twitch with anticipation. “Ohhh… I don’t know how much more I could take.”

"Then let's not waste any more time my love," Green said sliding his hands along her athletic hourglass frame and settled them on her hips.

Rainbow Dash threw her arms around him and started to kiss him as she had at Twilight's house passionately. Her tongue was probing into his mouth and beginning to twirl with his as her body became ever more heated with desire.

Green Thunder wasted no time in beginning to unzip her pants as they kissed. The sound of the zipper, and then the revealing of the front of her cute panties, caused his cock to twitch inside of his pants.

“Well, I see that my breasts aren’t the only thing that are getting bigger today.” Rainbow Dash teased as she unzipped his pants in the same way that he had just done to her.

Once Green’s pants were off, Rainbow could see his massive horse cock. The top of it was sticking out just above the line of his boxers, and the head was leaking pre-cum from the tip. It was looking ever more delectable to her eyes the longer she stared.

She immediately pulled downward, exposing the lower half of his body to her and she wasted no time in beginning to jerk him off. “Mmmm, Green, there isn’t a stallion alive that is as attractive as you.” She complimented her lover.

“Ahh… Dash…” Green Thunder replied in between sensual moans as he lowered his head to begin sucking on her hard nipples.

Her breasts were so big, so beautiful; he knew he was happier now than he had ever been. His hands moved all around the giant fleshy mounds, attempting to find some way to grab them entirely, but they were just too massive to do so. Green decided to just massage, and he rubbed them roughly, yet lovingly. He knew that she was still ultra-sensitive so he decided to increase her pleasure as much as he could.

Rainbow Dash moaned and gasped erotically as she ran her delicate hands along the length of Green’s penis. Both were now thoroughly aroused, and ready to escalate to the next level. Green pulled himself close so that he was pressed up against her breasts in a loving embrace. Rainbow's arms wrapped around him and her hands were running along his back.

They began to kiss a third time, but this make-out session was fiercer than any of the previous. Rainbow Dash tore off Green’s shirt, tossing it aside, and then the two ended up falling onto Dash’s bed with Green on top of her kissing her face and neck.

"I love you Dash," Green said in between pants as he tried to catch his breath from all the long kisses.

“I love you too Green …” Rainbow responded and then started to kiss him once again.

The two rolled around on Dash’s bed lost in their lust for one another. After a bit of rolling, kissing, groping, and moaning. Rainbow Dash found herself on top of Green Thunder. She was looking down at him as her massive boobs dangled just above his face. Her exceedingly long hair shrouded around them as if protecting them from the outside.

“I can’t wait anymore… I need you Green.” Rainbow Dash said in an almost desperate voice.

She started to mount him in the cowgirl position and then using her wet slit she began to grind it along the underside of his long shaft. Green could feel the warmth of her delicious juices starting to soak his rod. The pleasure it sent through him caused him to moan while he pulled his body up slightly and he propped himself up against the backboard of her bed. Now he could easily access her amazing rack while she rode him.

Rainbow continued to grind and moan while her boobies bounced with every thrust of her hips. Green reached his hands out to grope them somewhat roughly and used his thumbs to toy with both of her extremely erect nipples.

“Ohhh god!” Rainbow Dash shouted as her hips began to move faster, her pussy making a schlicking sound as the moist cunny ground against the fully erect dick. Her moans of ecstasy only encouraged Green to move forward and bury his face into the luscious mounds of flesh that bounced before him.

With both hands on her breasts, he licked, rubbed, groped, and smothered himself with them. Rainbow Dash had all that she could take and she lifted herself after grinding on him for several minutes. While elevated, she used her two fingers to pry apart her delicate labia so that she could reveal the inside of her moist cunt to Green.

“You like it?” Rainbow said partially moaning while she did so. “Well here comes more!”

She grabbed hold of Green’s penis and guided it into her tight, hot, and soaked vagina. She was taking it in slowly as it reached all the way up to her womb. She began to thrust her hips and bounce on his thick member roughly and it felt as though he was penetrating delicate silk.

“Oh! Ah! Ah! Ah!” Rainbow Dash cried loudly as she fucked her lover.

Green panted as he put his hips into it, thrusting up into her while she sat atop him and rode him like a good girl. Her pussy was leaking all over his balls and crotch, and her crying moans only caused him to move harder.

“Oh Dash!” Green moaned as he suckled her left nipple, and used his right hand to grope her right breast.

Their ferocious lovemaking became even speedier the closer they came to orgasm. The bed was creaking because both of them were fucking so hard. Green’s back slammed up against Rainbow Dash’s backboard.

“Ahhhh! Green! I’m… I’m… I’m…!” Rainbow screeched in ecstasy as she slammed downward as hard as her body would allow. Her melons were bouncing roughly around in front of Green’s eyes.

“Cum Dashie!” Green commandouted.

“OHHHHHHHHH YYYESSSSSSSSSSS!!!!” Rainbow Dash screeched at the top of her lungs as her hips and entire body started to shake from her intense orgasm.

Green could feel her love tunnel tighten around his entire cock as her body tried to suck the cum out of his balls by force.

“Ohhh Dash... I…I…. Ahhhh!!” Green yelled as he buried his face into her ample cleavage. His cock began erupting inside of her with an explosive force.

Rainbow Dash could feel his semen flood into her as she let out a whimper of pleasure. Happily being filled by the love of her life. “Ohh Green … Ah…”

The two sat there exhausted in each other’s arms for quite some time. Rainbow Dash didn’t even bother to pull him out of her while they lovingly caressed each other. Completely enamored with one another, the two reveled in their aftersex.

After another 10 minutes, Rainbow eventually removed herself from atop Green and semen began to leak out all over her beautiful covers. The bed was just a mess of both of their love juices at this point.

Green smiled and used his magical abilities to clean up the mess so that his love would not have to deal with it herself.

Rainbow Dash smiled because of his politeness and quickly took her place at his side in bed. “Thanks so much Green, for everything…” She said.

“Anything for you my Dashie…” He responded with a kiss on her cute nose.

The two snuggled in each other’s arms, kissing one another now and then. They were feeling relaxed and happy with the release of all that sexual energy that had built up.

Eventually, after snuggling for some time, Green ended up falling asleep with his head resting on her massive, comfortable breasts. Rainbow Dash couldn’t help but watch her cute boyfriend sleep.

She yawned and leaned back into her pillows. She felt better about herself, and the fact that she had made Green happy. With one last “I love you” Dash blacked out with her arms wrapped around her stallion.

…

…

…

Outside of Rainbow Dash’s window, Twilight Sparkle was peeping in on the two. She had a devious smile on her face and she put her hand to her chin.

“Hmmm… Well, I would say that that experiment was a success…” She said in an elated tone.

She looked down at her own D sized breasts and cupped them in her hands. She was starting to think that it was probably time to put that spell to greater use.

“I can’t wait to see the look on Trixie and Starlight’s faces when they see what I’ve been up to….” Twilight laughed to herself. "It should definitely make our ‘playtime' more interesting; that's for sure."

With that, Twilight turned away from the window and headed off towards her home with all kinds of devious ideas in mind for her unsuspecting friends.