Butt of the Joke

by bkill25

Rating: mature
Tags: Anthro, My Little Pony: Friendship is Magic, Spike, Rainbow Dash, Porn, Fetish
Length: 4123

You keep making fun of Rainbow's tiny ass, so she shrinks you and puts you in her running shorts.

You keep making fun of Rainbow's tiny ass, so she shrinks you and puts you in her running shorts.

Published 2017-12-27 01:10:06 UTC
Last updated 2017-12-27 01:10:06 UTC

Which Leads to Something More

Butt of the Joke
ALT

"Say my butt is big!"

You shake your head. "Never."

"C'mon! You're like, an inch tall, so these puppies should be like mountains to you!" Rainbow digs her fingers into the flesh of her asscheek. "To say they're not huge is like saying...it's like saying you're a liar!"

You take a few moments to process her logic, then blinking at its absence. "Rainbow look, just because you shrunk me doesn't make your ass suddenly bigger; it just becomes bigger to me now. Your butt's still tiny to the rest of the world." An idea strikes, and you drag a claw down your face. 'In fact, if you were willing to steal from Twi's potions to prove me wrong, why not drink something that would actually make your ass bigger!" Your throw up your claws. "Shrinking me is a complete waste of time!"

"Riiight," Rainbow says, shifting in her spot before wooden desk you were on. She crosses her arms. "So all the more reason to say my ass as big—that you've learned your lesson, and thus, give this encounter some purpose."

You were so fucking confused, and, much to your dismay, slightly horny. It isn't every day that a giant Rainbow Dash towers before you, wearing nothing but black panties and a pink bra, digging her fingers into her ass. You had to admit, that at this micro size, each of her cheeks are the size of a mountain.

But you don't dare let her win. "In your dreams, Rainbutt, now turn me back and let's forget this whole mess."

"Uh-uh!" Dash shakes her head, strands of rainbow flying through the air. "You hurt my feelings, so now you're going to make things right." She pushes her ass out towards you, dominating your vision. "Now apologize to my sisters!" Her cheeks slam onto the table, a shock-wave vibrating through the surface. "Or be crushed underneath them!"

You squint your eye and tilt your head. That didn't seem like a terrible proposition.

Maybe you could find a way to get off on this.

"I told already told you, Dash!" you say, stepping forward. "Your ass is tiny, and there's no denying it. Why, even at this size, I bet I could wrap my arms around your cheek and have room to spare!"

"Oh yeah!" She leaned over the table, letting her cheeks rest there in all their glory. "I'd like to see you try, much less feel!"

You can't believe it: Dash took the fucking bait. You begin to barrel forward, the surface of the desk blurring below your feet as her distant cheeks grow in proportion to your proximity. In just a few moments, you would be upon her furry cheeks, throwing your body into the flesh as much as you pleased.

For the time being, both of her furry cheeks rested on the desk, kept together by black panties. The cord strained to keep around Dash, making the bottom of her cheeks exposed, causing them to fill out around the fabric. They must have been uncomfortable to wear, and then it clicks: she wore them on purpose, anything to make her ass appear fatter than what they really were.

When you joked about her ass being tiny, you must have struck an insecurity of hers pretty hard—hard enough for her to find merit in shrinking you. You manage to sigh as you run, knowing that once you had your fun, you should really apologize to the gigantic mare.

But for now, it's time to enjoy her ass.

Rainbow's ass is like a wall to you now, stretching countless feet left and right, standing at a height you could never attain regardless of how high you jumped. You come to a stop a few feet in-between her cheeks, panting softly as you enjoy the view.

"Are you doing anything back there?" Rainbow's voice booms as she's facing forward. Her arms are crossed as she clenched her cheeks together. "Or are you too tiny for me to feel anything?'

"Oh, trust me Dash!" You rise back up, done with your break. "You're about to feel something now!" You throw yourself against her right butt cheek, letting your body sink into her exposed under-bottom, and your face pressed against her black panties. You feel her jolt from your contact.

"Finally braved yourself to touch a mare, eh?" she says, glancing an eye over her shoulder, using it to look down at you. "Courage ain't much worth as much when you're only an inch tall. Feels like a gust of wind has touched my flank."

You smile. You're allowed free range.

You first begin to intake the sensation flooding across your scales. Rainbow Dash, much to her credit, has a lot of flesh to her ass—not so much as fat but proportion to the rest of her body. It bounces to the sway of her hips and jiggles from your ministrations, with enough muscles at its core to put even a dragon-like you to shame. It's strange to think, that even though you called it small, Rainbow Dash's ass is perfect in your eyes.

"You going to give me a show or not?" Rainbow booms again, looking forward, again. "Unless ya just wanna admit my ass is to big for you to handle."

"In your dreams!' You fling your body more into her cheek, pressing yourself against the flesh as you sink into it. The sensation of her fur against your scales, especially at this size, has you in bliss, and your shaft begins to rear its head. You aren't afraid of Dash feeling it press against her cheek: she was mostly right in saying she wouldn't feel you.

"Now we're getting feisty, huh?"

You ignore her words and focus more on your groove. You begin to thrust your cock into the flesh of her asscheek, feeling it sink a few inches as your body soon does the same, the flesh then rebounding you and your cock. You smile and begin to hump your whole body against her right cheek, taking more delight the harder your cock got.

"Whoa," Rainbow says, her voice tittering. "For such a small body, you sure have a presence." She bites her bottom lip and stifles a moan. "Mmmm. Don't stop, Spike."

You didn't plan to, but you'd like to give the illusion of doing so. You step back from your work, seeing an imprint of your body on Dash's bottom right cheek as well as the shiver running up the mare's body. She looks over her shoulder. "What the hell, Spike!?"

You smile. You weren't the only one getting off on this.

You make amends by presenting yourself to her left cheek, just in desperate need to be hugged just like its sister, and you do just that. Opening your arms as wide as you can, you run forward into the cheek, it jiggling from your contact, as you contain most of the flesh into your hug. Your hips start thrusting forward on their own, fucking the fat as it continuously rebounded back.

"Heh, looks like, heh, looks like shrinking you wasn't such a bad idea after all?"

You agree, had you know you got this horny at bring shrunk. The fur of Dash's blue cheek feels excellent against your scales, even better the fat of ass you can just sink in to, wanting to fuck each cheek for all that you were worth. You wish you were a bit bigger so you could fuck each cheek at once, but that only give you an idea.

You being to glide over her cheek, delighting in how both of your heads sunk into the flesh as your feet carried you right. Before you knew it, you had shifted inside the crack of the mare, your face now pressed against the soft black fabric that hid her most delicate of places—you could feel the outline of her asshole on your face.

"Spike...what are you doing?"

You chose to smile instead of a response, having your back to her right cheek and your front to her left. Her panties keep them pretty tight, but there's still space for you in the middle. Each of her cheeks towers above you by a few good feet, like you're stuck in a valley of black and blue, it all so soft and accommodating to your movements.

You decide to take advantage of that last part.

You being to thrust your hips into her left cheek, feeling your cock being caressed by the soft blue fur as it sinks a few inches into the flesh, the cheek then rebounding your efforts. You only grin as your back is absorbed by the right cheek, the meat of ass filling around your body and your spines, your cock growing harder as it is then pushed back into the left cheek.

You're small enough that, every time her cheek jiggle, it's enough momentum to fling you forward and back. You're able to fuck Dash's ass without even have to strain yourself—only to delight in being thrown back and forth between the cheeks.

"Oh deal Celestiaaaaaa," Rainbow's voice rumbles through her body, including her cheeks, which vibrate all around you. Truly things couldn't get much better than this. "You always find a way to prove me wrong, ahhh, don't ya, Spike?"

To hell with right and wrong. You're about to cum between her asscheeks.

"So tiny little you can make me shiver cause my ass is so tiny," she says, huffing, no, panting.She's planning something. "So maybe my ass isn't the biggest around, but at least it can do this!" And with that, she clenches her buttcheeks, catching you straight in the middle.

You gulp at suddenly feeling the muscle beneath the fat, pressing hard against your cock as the flesh supporting your back becomes a wall. Dash releases you, allowing the ass-fat to smother you on both sides, before she clenches against, making your surrounding tight.

Clench. Release.

Clench. Release.

"How does it feel, Spike?" Rainbow asks, looking down at your pitiful form. "To know that this giant, beautiful mare has you caught in-between her ass. That her cheeks are like mountains to you, and she's using them to crush you with every clench I do." She giggles. "Once clench is nothing to me, just a simple sensation. But to you? It must be like a furry blue world closing in on you."

There's a primal tone to her voice, making you go lustful. Dash may have easily dwarfed your size with her ass alone, but even then, she required your presence to get off, and you were going to use that you benefit "Nice try, Dash, but your ass is still tiny even at this size. Maybe if I were in-between the cheek of Rarity..."

"What does Rarity have on me!" Rainbow clenches her ass the hardest thus far, and there isn't an inch of space between you or either of her asscheeks. You enjoy being smothered in the flesh. "So what if she's got an hour-glass figure, with a rack and ass bigger than mine! It should all feel the same to you!"

You push your claws into her left cheek and your feet into her right, separating them by a few inches, granting some fresh air into the stuffiness of your area. "Bigger is always better! If this was Rarity, she could have me between her cheeks and go on the day without knowing where I was."

Rainbow squeeze her ass even harder, your claws and feet sinking into the flesh, but you kept holding her best efforts back. "If Rarity went jogging, then that would be paradise to me! Her big, white cheeks, clamping around my body—her fur rubbing against my scales..."

"That's it!" Rainbow cries, and just like that, her ass relaxes. You fall along her crack, body sticking to the back of her panties. Before you can collect yourself, a pair of giant blue fingers does it for you, pulling you out from their owners crack. The world blurs around you, and before you know it, you're presented before a large, angry, cyan face. "You think Rarity is so much better than me, huh?!"

You bounce your head left and right. The grip she had on you was beginning to hurt, the expression of anger even stronger on her face, so you didn't know how much longer you could still play this game and live. "Just in the tits and ass department—at least for size!"

"So bigger is always better, huh!" Rainbow hovers you between the bridge of her nose, each of her monolithic size eyes looking up at your tiny form. "So you're telling me, that if you were between Rarity's cheeks, your cock would be bigger than it is now?"

"More than likely," you say, grinning despite your fear. "Because Rarity wouldn't be so insecure as to shrink me, and she would have plenty fat on her ass to accommodate my normal sized cock. Face it, Rainbow: Rarity could get me off better than you ever could."

"Oh yeah?" she says, a giant grin stretching her lips down below. It was scary to see the same action you had done only twenty times as bigger—that, and the possibility that those lips could take you easily into their cavern. "You sure a mare as posh as Raritywould ever take a dragonlike you?"

Ouch. She's playing your game now.

"A scaly dragon that never leaves his room," Rainbow begins, walking around the room with you still pinched between her fingers. The whole movement is jarring, and you flinch a great many of times. "Doing the bare minimum and then retreating. You're good, Spike, but you haven't improved yourself to be good enough for her."

Damn it. She'd been reading your insecurity as well.

"Hard to get off on a mare that won't put out, huh?" Rainbow says, making your head dip in thought. She then moves the hand you're on to behind her back, presenting you to the strap of her black bra; it stretches on across the expanse of her furry blue back. "Well, this mare is willing to do something for you: so long as you hold onto that clasp."

You're confused by both the change in altitude and attitude, but your second head takes control as the sound of a possible reward. You do as you are told, both of your claws reaching and holding the clasp to her bra. The blue fingers let go of you, causing your lower body to swing to her back; the impact is almost explosive on your cock.

"That's better!" Dash says, returning both of her hands. "Now I can finally get stuff done!"

You begin to worry as the giant strides forward. Each step makes Dash's body shake, knocking your body left and right, as your claws struggle to hold onto the fabric. "Uh, Dash! What exactly are you going to do!?"

"You told me about your wish," Rainbow booms, the only thing as loud to your ears is the giant strides below, "and I'm going to be the mare that makes it come true. Rarity may have me beat in some places, but she ain't the one helping you to beat your meat."

You gulp as she stops before a wardrobe.

"You may be tiny, but I could still feel your cock every time it pressed into my ass cheek," she giggles as she pulls back a drawer—the simple movement tossing you about like a rag doll along her back. "It feels even harder now that you're holding onto the bra that keeps my boobs together. You know, Spike, if I didn't know any better, I would think your second head has a bit of thing for me."

You gulp, lowering your head.

"I wonder—does your first head feel the same way?"

You're silent. Dash shuffles through the clothes of her drawer, clueless to both the plights you had about this mare. She was dedicated and funny, motivating yet disciplined, and her looks were to kill for—her ass and breast excluded. She had such an addictive personality that it got someone like you to leave your room to accompany her on daily jogs, and even though her ass was tiny, its perkiness was perfect in your eyes.

You wonder if you two could ever be an item, and then, Rainbow Dash begins to slide her panties down her endless legs. Your mouth goes agape as the furry cheeks down below jiggle, filling out into the air in the joy of fully being exposed.

Your 'joy' reaches full mast in exposure as well.

"D-Dash!" you squeak out, feeling her body lurch forward as her panties reach her feet. She swipes them off, and then, raises them into the air with her index finger. "What are...what are you doing?!"

"Making your dream come true, of course!" Rainbow says as she stands fully back up. "Your favorite pair is exposed down below, why not steal a look while it lasts." She then laughs. "Unless you truly think my ass is unattractive?"

Damn it. Dash is playing with both your feelings and your cock. You look down, past the expanse of her back, which coerces near the bottom, and her ass stands on full display. They're utterly massive even this height, each cheek round to perfection with just the right layer of fur, looking plush enough to jump upon. You'd like to feel them jiggle around you once more—and it seems like you were about to get your wish.

"Why are you doing this, Dash?" you say as loud as you can, looking up the back of her head. Strands of rainbow hang above your head, though her blue neck and ear are exposed. "No pony goes this far to get revenge for a joke."

"They do," Rainbow says, looking over her shoulder and down at you. Any anger or excitement has faded from her face, only a fragile expression taking their place. "When it's the pony they like making fun of em."

"The pony they like?" you repeat in a low voice, piecing it together. The nagging to go jogging, trying to get you to the gym to impress Rarity, the openness about herself that allowed you to joke around in the first place. Then it became clear from the very start. "You like...me?"

"Of course I do, you big dumbo!" she lifts a finger with the panties over her shoulder, its long black expanse right next to you. A musk comes from them, Rainbow's musk, and you can make out a wetness near its center. "I wouldn't have ruined a good pair of panties if it wasn't because I have the dragon I like so close to me."

"I...I don't know what to say, Rainbow," you say, your mind blank for words, so you go to your heart instead. "I mean...I really like you too. A lot." You shake your head, adjusting your grip on her bra. This is all so weird, but that's no excuse for you not to express how you feel. "My heart has always taken me in the direction of Rarity, so much that I haven't considered anyone else. But, when I'm around you, I always feel so warm and wanted..."

You look down, but you're too lost to the world to focus on her asscheeks.

"Give me a day," you hear her whisper, causing you to look up at the back of her head. "Keep this size and let me have you for a day, and you'll be mine even when tomorrow comes around. I know I can win that heart and second head of yours from Rarity."

You chuckle, knowing only someone like Rainbow could think along those lines. With Rarity, you felt you had to be on your A-Game, but with Rainbow, you could be yourself around her, letting everything that you thought and felt be heard by her ears, and she would do the same for you.

You and Rainbow understood each other's twisted humor. You essentially just got each other. She was no Rarity, but maybe, she was good enough. No: Rainbow was better than what you deserved, yet here she was, offering you her giant and caring body.

"Alright," you say. "I'm yours for a day. I'm not sure you'll be able to steal my heart from Rarity, but if anyone could, it would be you, Dash."

"All right!" Dash claps her hands, the sound almost making you go deaf, but seeing such raw excitement puts you in a forgiving mode. Then, you feel her body sway as she lifts both her legs. You look down to see tight black shorts being pulled up. "Time to make our wishes come true!"

"D-Dash!" you yell, feeling your forearms beginning to burn from holding on for so long. "Starting to get tired here! Think you can stop moving around so much, maybe even pick me up again?"

She laughs. "No can do, partner! You're mine to do with as I please for the day, remember?"

Your claw slips, dangling like the rest of your body, as your other claw begins to slip. "D-Dash! I'm going to fall!"

"I know!" she says. "That why I made you hold on to the first place—you're not getting to second base quite yet, amigo."

You went to scream something back to just screaming out of fear instead. Your claw had slipped, and you were now falling downward, feeling a current of wind cut into you as you fell, seeing the floor lurk vistas below. You couldn't believe that this is how you're going to die, because of Dash much less—it didn't make sense.

You see the hand that had carried you down below, and you sigh, thinking that she meant to catch you. Nothing could be further from the truth when her fingers instead went to the back of her shorts, pulling the waistband back a few inches, and you could see into the darkness her blue furry cheeks.

Dash meant to catch you with her ass, and there was nothing you could do about it. You fell and your fell, her shorts, and her cheeks growing larger and larger, and before you knew it, you slipped past the waistband and into the darkness. The cheeks jumped upon your impact, jiggling back into place while sucking your body into their crack.

You pant, glad to be alive, but knowing to act fast before you are trapped. You crawl upward, ticking the fur of Dash's asscrack as you do so, trying to reach the light just past the band of her shorts. You're just a few feet away, placing your feet on top of each of her cheeks, reaching out towards the light.

"Nice try, buddy!" Just like that, the giant blue fingers retreat upward, the band snapping against her lower back. The sudden movement causes you to tumble into the darkness, but luckily for you, your fall is absorbed by each of her cheeks. "Now, I know you think being tiny precludes you from jogging." She giggles in the distant, and you feel her cheeks jiggle slightly in response. "Luckily, your big sis Rainbow Dash is going to take you along with her."

You feel her body shift as she beings to walk. You look to either side of you, through the thick darkness at her thick thighs, seeing them stride with every step she took. Worst (or perhaps best) yet, since she had on no panties, the fur of her ass kept you stuck in her crack, the cheeks filling around with every jiggle.

Being in Rainbow's shorts is both torture and pleasure, depending on what head you ask.

You feel the larger body bend over, its cheeks filling out into the shorts as your pressed more inward. You come face to face with her blue ponut, gulping as it winks at your movement. You're pulled back to a safer place between the cheeks when your host stands straight again.

"Running shoes, check." You see a faint outline outside the shorts, and before you can begin to ponder, it smacks a cheek—both of them smacking into you as her ass begins to shake. "Little dragon trapped between my cheeks, check." You hear a door open and birds beginning to sing—how fucking cliche. "Time for my morning jog with no underwear?"

You sigh. Rainbow giggles.

"Let's just see if the clapping my tiny ass is to much for him."

And just like that, your host begins to run, and the cheeks of her ass engulf you completely.

You cry, knowing there's still a full day ahead with the giant mare.