Best Ass In Equestria

by MassDriver

Rating: mature
Tags: Other, Sex, Gilda, Human, Anthro, My Little Pony: Friendship is Magic, Rainbow Dash
Length: 3747

Gilda and Rainbow Dash both know that human guys have the best, tightest asses. But which of their boyfriends has the VERY best one?

After a double date in Canterlot, Gilda and Rainbow Dash are walking home with their human boyfriends. But even on a friendly outing, old rivalries still simmer... and the fliers find themselves unable to agree: which of their boyfriends has the best ass?

For a couple of muscular well-hung futas, it's an important question... and after they almost come to blows, they come up with a better idea. How about they prove to each other which ass is best, with a night of hard pounding and boytoy-swapping?

(Rainbow Dash and her boyfriend are from Beneath Her Wings by Problem Grippin. Gilda and her boyfriend are from Gilda the Girlfriend, by me.)

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

I've also set up a Ko-fi! If you want to support my work but you're not looking for a commission, it's a great way to leave a tip!

Contains: Futa on Male, light muscle worship

Cover art is derpibooru 505939, drawn by ss2sonic and colored by zeeveegee. Used without permission.

Published 2017-01-12 03:10:01 UTC
Last updated 2017-01-12 03:10:01 UTC

Hot Competition

"Right, but you've got, like, actual skills," said Anon. He stopped walking, standing under a streetlight on the Canterlot sidewalk, and turned around to look at Al. "Lawyering and such."

"Don't be modest!" said Al, giving Anon an encouraging slap on the back. "You're the representative of a whole species!"

Anon scoffed. "Sure," he said. "I'm the main event in Twilight's traveling zoo. She pays me to be a human and go on trips with her." He laughed ruefully at himself. "You've gotten yourself a real job, and I'm just sucking at the government's teat."

Talons curled around Anon's shoulder, squeezing like a vice. Just enough force to hurt... and not an ounce more. Just like always. "You've been sucking on someone else's teats?" asked Gilda, leaning her beak close to his ear.

"Figure of speech," said Anon. "Your body is all the nourishment I need." Gilda's talons uncurled, and Anon spun around to face her.

"Ooh," said Rainbow Dash. "Gilda, you feed him with your boobs? Kinky."

"Not like we haven't tried it," said Al, slipping his hand around the rigid muscle of RD's torso.

"Hmm, which is better?" mused Anon. Like Al, he embraced his partner, wrapping his hand around Gilda and curling his fingers around her powerful glutes. "Horse milk or bird milk?"

"This shit again," snarked Gilda, rolling her eyes. "You know I'm not just a bird, right?" She turned to Dash. "This dweeb's dating a magical beast and he doesn't even know it."

"Well, my dweeb knows exactly what he's got," said Dash. She put her arm around Al, pulling him closer. "He's got the fastest flier in Equestria, and in exchange... I get the tightest ass in Equestria."

Gilda straightened her body and stepped towards Rainbow Dash, throwing off Anon's embrace. "Excuse me?" she said, raising her wings slightly. "Am I hearing you right, Rainbow Crash?"

"Yeah, you heard me," said Dash, with a confident smile on her face. "If you want to race me, Gil, I'm ready anytime."

"Not that, Dash," said Gilda. "You think your human has the tightest ass?" The griffon palmed her boyfriend's ass, clawing at it possessively with her talons.

"Let me guess," said Dash. "You think yours does?" In one smooth motion, she whipped his body around, picked him up by his waist, and bent him over, pointing his butt at Gilda's appraising eyes. Dash's fingers sunk into the crack of Al's ass, poking at him through the seat of his pants. "It's great that you love your little guy,” said Dash (and a visible twitch of discomfort darkened Gilda's features at the mention of the word “love”), “But his ass can not be tighter than Al's. I mean, for one thing, you must have loosened him up during that whole period where you were... you know... huge."

Rainbow Dash set Al down and held her arms outstretched, miming the width that Gilda's body had once attained. The griffon's body had shrunk considerably since she and her boyfriend had had their heart-to-heart, back down to just under eight feet. Over the past few weeks, she'd been slowly rediscovering the benefits of being almost normal-sized, like fitting through doorways and being fully clothed. Her shorts still hugged her bulging crotch tightly, leaving little to the imagination, but she wasn't busting out of them anymore.

At the mention of him being "loosened up," Anon crossed his arms. "My ass is fine," he said, avoiding eye contact with anyone. Gilda chuckled.

"It is?" asked Al. "Because I saw how big she got, and..." he whistled. "I mean, Dash almost kills me with her mare meat, I can only imagine what you-"

"It's fine," Anon interjected. "I mean, yes, medicine was involved, but... long story short, it's fine."

"Not as fine as yours, Al," said Dash. She came up behind Al and ground her crotch into his ass. All the talk of human asses had given her some serious wood, and she was eager to share it. "Sorry Gil," she said, working her hard-on up and down the crack of Al's ass, "But you're gonna have to settle for second place. Just like old times, huh?"

Gilda stomped her foot - she could still shake the earth when she wanted to - and stared down her beak at Dash. "If you're gonna make this personal," she said, "You better be prepared to back it up."

Rainbow Dash stepped out from behind Al and gently pushed him aside, staring confidently up at Gilda and subtly flexing. Gilda had the height advantage, but Dash cut a pretty imposing figure herself - she was pure muscle, a fact that her clothes could do only so much to conceal. Her arms were thick with muscle, her legs even more so, and if this dispute came to blows, it wouldn't be easy to pick a winner.

"Woah, woah!" said Anon. "Are you two going to fight over us? That is, uh..."

"Totally unnecessary," said Al.

"...Incredibly hot," said Anon, at exactly the same time.

Dash let her tensed body relax. "He's right," she said, breaking into a smile.

"Which one?" said Gilda. "I mean, they both have a point, Dash."

"We don't need to fight," said Rainbow Dash. "Fighting wouldn't settle our argument."

"Right," said Al. "We don't need to 'settle' who has the tightest ass."

"Now, hang on," said Dash, raising her eyebrows suggestively. "I didn't say that."

"I mean, what's the difference?" said Rainbow Dash, as she ran her fingers along the inside of Al's waistband. "Both of you boys were going to go home and get fucked. Only difference is, now we're all doing it together. Even more awesome, right?"

Al and Anon were bent over the side of Al's bed, side-by-side, with their respective girlfriends behind them. Rainbow Dash and Gilda had originally wanted them to be on opposite sides, presumably so that the girls could stare intensely into each other's eyes while they fucked their boyfriends. But Al and Anon had vetoed that arrangement.

Stiff dicks in hand, the girls stripped their boys, working their pants down, exposing the bare asses that they prized so highly. "Mmmnh," muttered Dash as she stared at Al, squeezing an asscheek in one hand. "Love that body, babe. I notice Gilda's boy isn't so toned."

Gilda spread her talons along Anon's asscheek, pressing an indent into his exposed flesh. "I like my boys a little soft, Dashie," she said. "More cushion for the pushin', you know?"

"Also, if I may... I distinctly recall -" Anon was about to point out that Al's physique was due to a magic potion, but he went silent as the palm of Gilda's hand covered his mouth.

"We've been talking all night, treasure," said Gilda. She pressed her shaft into the crack of Anon's ass, and he moaned into her hand as he felt its heat on his skin. "I think it's time our bodies did the talking. But if your mouth wants to say something like, 'fuck me, Gilda, please fuck me...' I'll allow it."

Gilda worked her hips back and forth, hotdogging Anon's ass, opening his cheeks wider as she worked herself deeper. Precum began to splatter onto his back as Gilda worked herself up, and the teasing made Anon lose himself. He was following Gilda's script now, begging in a breathy whisper to be fucked.

"Damn, Gilda," said Rainbow Dash, "You still know how to make a guy beg for it, don't you?" She pressed her fingers into Al's hips, massaging him with slow movements of her hands, and split his asscheeks with the tip of her cock. "This isn't the first time we've watched each other plow boy-butts," she said, "But it is the first time we've done it to boyfriends, instead of one-night stands. Kind of a milestone." She smacked his ass, and he shuddered.

Dash pressed the tip of her cock into Al's pucker, drooling pre onto the quivering ring. "I'm workin' with twenty inches over here, Gil," she said, turning her head towards the griffon. "Yourself?"

"Funny thing," said Gilda, "That's what I was at, last time I measured. Used to be bigger, 'course... but my boy's ass is so tight, it still feels amazing in there." She centered herself in Anon's butt, parking her dripping tip at his entrance.

Dash chuckled. "Glad to hear it. And since our equipment is the same size, this'll be a nice, fair contest. I know we've both got plenty of stamina, so whoever comes first must be inside the tightest butt, right?"

"Makes sense to me," said Dash. "Yo Al, you ready for me?"

"So ready, Mamacita," said Al.

"Love ya, babe," said Dash. "All right, Gilda! Three, two, one, go."

Dash and Gilda were both girls who liked to play rough, but they had learned to be gentle with their boyfriends. They'd gotten to know the bodies of their lovers, and come to understand that tenderness, and going slow, could be just as rewarding as a rough, sweaty fuck.

But this wasn't a night of romance. This was a competition. The girls grabbed their boys' hips and thrust with all their strength, pounding at their backdoors with irresistible force. They both plunged deep on the first stroke, and the men cried out in unison, groaning as their asses were forced open. But the girls didn't give them so much as a moment to adjust; they pulled back out and thrust back in, as their red-faced boyfriends gasped for breath.

As the battered buttholes of Al and Anon adjusted to the meaty invaders, the girls worked themselves into a rhythm, building speed as they went. This was no test of stamina; they were trying to get themselves off quick, to prove that their boy's butt was a tighter, better cocksleeve. So they fucked fast, in long, hard strokes, running their medial rings in and out of their boys' holes, bumping roughly against their prostates with each thrust. The guys, leaning on the bedside, were struggling to stay upright on knees and shoulders that felt like jelly.

“B-babe,” groaned Al, “You're really givin' it to me...”

Dash reached forward and ran her fingers through his hair. “You're doing great,” she said. “Let me know if it's too much, okay?”

“No, this is...” Al grunted and flexed his shoulders. “This is nothing. And... you gotta win this thing, right, angel?”

“No fuckin' way,” said Anon, through gritted teeth. “Gilda, I'm not dating a second place ass-rammer. Fuck me... twice as hard, baby.”

“Seriously?” asked Gilda, one eyebrow raised.

“No, no,” said Anon. “I would die. I just-” His body quivered, and he heaved some heavy breaths. “Oh fuck, fuck, Gilda, I'm coming! Urgh – go on without me!” He gripped the bed and groaned, spilling ropes of cum onto the bedsheets.

“Right behind ya, babe,” said Gilda, still hammering his slackened body. “'Bout to flood your butt with my bird seed.”

“I am not losing to you,” grunted Dash, thrusting deep into Al. “Get ready, papi. Gonna fill that tight little ass.”

“I'm ready,” said Al. “I'm ready, fill me up.”

Dash dug her fingers into Al's hips and went deep. Al felt a throb go through his walls, and Dash yelled his name as her balls tightened and her load rose through her shaft. Then a squawk overpowered Dash's outcry, and Gilda was coming, filling Anon's backside with thick, hot jets of jizz at the same time Dash was filling Al's.

Al's climax hit at about the same moment – his human load was leaving his shaft just as his ass was absorbing a decidedly inhuman load from his girlfriend's fat cock. Both humans were ready to receive belly-bulging loads from their girlfriends, and the ladies didn't disappoint; after the first few shots of cum, there was visible growth in their midsections. Shot by shot, the girls fattened up their boys, until they were both lifted off the bed by their growing bellies.

Finally their climaxes wound down, and they both milked the last of their cum into the overfilled ass of their respective dude. Then they pulled out, and the guys groaned in unison as they were left empty – but still very, very full.

“All right, that was a squeaker,” said Rainbow Dash, plopping her ass on the bed next to Al, “But the win goes to Team Al's Ass. I started coming just before you squawked.”

“Woah, woah,” said Gilda, raising a hand. “First of all, that wasn't a 'squawk,' it was a noble cry of sexual dominance. And second, I was coming before I made any sound.”

“So you won't admit you lost,” said Dash. “I shoulda known.”

Al groaned – not just from the fullness in his sloshing belly or the lingering ache in his ass, but from annoyance. “So this didn't settle anything,” he said flatly.

“Well yeah,” said Anon, rolling over onto his back. “I could have told you this wouldn't change anybody's mind. You two already know what your own boyfriend's ass feels like. This exercise didn't provide any new information.”

“Damn, babe, you're smart,” said Gilda. She reached down to rub his bulging belly, and he moaned softly as the talons caressed his skin. “So what you're saying is... the two of us need to switch off?”

“Oh, are you kidding me?” muttered Al. But the girls weren't listening – Gilda and Dash were already starting to nod at each other.

“You'd be okay with that, Gil?” asked Rainbow Dash. “You seem a little... possessive when it comes to Anon, ya know?”

“Oh, I know he's mine,” said Gilda, softly curving her talons around Anon's cock and balls. “And I don't mind sharing him with you, Dash.” With her other hand, she gently punched Dash in the shoulder. “Sharin' guys with you was half the fun, back in the day.”

Al turned himself over and stared up at Dash. “I don't know about this... you filled me up pretty good, Mamacita.”

Dash leaned over Al, pressing her cock against his, knocking their ballsacks together. Overshadowing him, as always, with her size. Al felt his cock, soft from the recent climax, begin to rise again. RD could always do this to him – her perfectly toned body and her big hard cock had so much power over him, making him spring back up for another round, even when his ass was ravaged and his gut was filled with cum. “Come on,” said Dash, “Do it for me, babe?”

Al stared up at Dash, looking past her rippling chest and her round, firm tits, up at her smiling face. His cum-bloated belly made it hard to sit up, but he pulled himself towards Dash, hooking his hands under her toned ass and drawing his face up to her boobs. “For you, Dashie...” he whispered, and he flicked his tongue out, licking at the pegasus' dark blue nipple. “For you.” He pressed his mouth against her right tit, suckling at her nipple and scraping at it gently with his teeth. His hand caressed her abs, feeling the contours of the powerful muscle just beneath her skin. Dash held him close, running her hand through his hair.

“And I bet you like this idea just fine, you fuckin' slut,” said Gilda. She placed her arms under Anon's torso and lifted him up. Due to her height, Anon's head only came up to her abs, and her heavy tits rested on the top of his head.

“I'm a slut for you,” said Anon. “But if my big, strong girl wants to share my body with her friend...” He stopped to nuzzle his head against Gilda's abs, rubbing the umber fur and breathing in her scent. “Mmm... my body's all yours, girl. You can use it, share it... whatever your heart desires.”

Gilda's cock, slick and half-hard, grew back into a full erection as she pressed it against him. “You are so good to me,” she whispered. She lowered him onto the bed, and looked over at Rainbow Dash. “Be careful with him, Dash.”

“I'll treat him good,” said Dash with a smirk, setting Al back down on the bed. “Just as soft and gentle as I am with my own little guy.” The girls switched places, and placed their hands on the bare hips of their friends' boyfriends. Al and Anon lay face-up, locking eyes nervously with the women who were about to fuck them. “Well,” she said, staring down at Anon. “Ready for a wild ride? I don't wanna come between you and Gilda, dude, but this is gonna be unforgettable.”

“It's your man who's gonna be begging for another boyfriend swap,” said Gilda. “Once he gets a load of griffin meat up his back door.” She pressed her tip against Al's pucker. “Let's not waste any time, Dashie. I wanna see you fuck my boyfriend's ass in three, two, one... go.”

Dash fumbled to get her dick in position by the end of the three-count, bumping the flared tip of her cock against Anon's asshole. Anon groaned and rolled his head back – and then it snapped forward as Dash rammed her way into his backdoor. “Fuck!” he yelled, beating his arms against the bed. “You... you don't... nnnh... hold back, huh?”

“Junior speedsters never hold back,” said Gilda. She'd burrowed more than half of her shaft into Al, who was breathing deep, his cum-filled belly rising and falling with each desperate breath. “Al here knows what I'm talking about. He is loving this thick meat I'm feeding his asshole. And... fuck, he is pretty fucking tight, Dash. I can see why you thought he'd measure up...”

“Your boy's no slouch either,” said Rainbow Dash. She slid herself in and out of Anon's cum-slicked hole, moving faster and faster. “Human ass is just insane, Gil. This guy's for sure the second-tightest ass I've ever been in.”

“Second?” growled Gilda, matching Dash's pace, spearing Al so deep that she could see the outline of her cock in his belly. “This is a top-tier ass, Rainbow Crash, but my boy still takes the gold medal.” She glared down at Anon. “You ain't going easy on her, are you, babe? I want you to squeeze her cock the way you squeeze mine.”

“...Trying...” grunted Anon.

“How about you, Al?” asked Dash. Without slowing the pace of her thrusts, she looked over at her boyfriend. “You keepin' that ass nice and tight for my buddy Gilda?” Al nodded weakly. “That's my man,” said Dash proudly. “You're a good sport and a damn good fuck. Love ya, babe.”

“Pfft,” scoffed Gilda, staring down in Al's eyes. “Maybe your ass would be tighter if Dashie wasn't so soft on ya, little man. The bedroom's not the place for that mushy stuff. Lemme – urgh – lemme show ya how a girl claims a man's ass.” She went deeper, hilting her twenty inches inside him, and his jaw went slack as a helpless moan crawled out of his throat.

“Oh, you think you can claim my boy's butthole, Gil?” challenged Dash. “Sorry kid,” she said, turning her face down to Anon, “But Gilda just made it personal.” She rammed herself home, sinking every inch into Anon, then back out and all the way back in. The girls turned away from the boys at met each others' eyes, making furious, unbroken eye contact as they thrust faster and faster, savaging the asses in front of them with decades' worth of competitive vigor. Al and Anon gasped brokenly, unable to form words as their bodies quaked from the impacts, trying to beg for mercy as Dash and Gilda went to town on them. The girls barely noticed when the guys came, their stiff cocks splattering the underside of the girls' tits with their hot human loads. But the climax made their asses tense and constrict, tightening around the fat shifts inside them, and Dash and Gilda both felt their balls tighten as orgasm rose up within them.

“Fuck,” grunted Gilda. “This... fuckin'... ass...” She sunk her talons into Al's asscheeks. “I'm gonna blow, Dash! Gonna fill your boy with a big... hot... load...”

“Me too, Gil,” hissed Dash through gritted teeth. “I know you like to see your little soft boy all big and bloated... gonna pump his ass up!”

The girls came, and this time it was clear from the beginning that they'd hit their climax at the same time. Their cocks gushed with cum, in an outpouring no less intense than their last. From the first instant, Al and Anon could feel their bellies growing, swelling, groaning with the rapid, unrelenting inrush of jizz. Dash pulled out first, fearful of breaking her best friend's boytoy, and cum dribbled from Anon's ass as she made her exit. Gilda, seeing Al's eyes start to roll back in his head, pulled out and let the rest of her climax hit the carpet.

Over the next minute or so, Al and Anon's vision cleared, and their hearing slowly returned - and Gilda and Rainbow Dash were still arguing about whose ass was tighter.

“Oh my god,” said Al. “Can you two give it a rest? Just accept that this is never going to be settled.”

“Yeah,” Anon agreed. “You both have boyfriends you-” he seemed to trip over his words, but recovered: “...care about, and each of you at least thinks your boyfriend has the tightest ass on the planet. Just be happy with that.”

This didn't seem to satisfy either of the girls, but they put on thoughtful faces as they considered his words. Finally, a smile dawned on Dash's face. “You know, he has a point. We're a couple of fat-cocked girls, and we've got out tight-bottomed boyfriends right in front of us...”

“Yeah, I see what ya mean,” said Gilda. “We can argue anytime. But there's something else we could be doing that's much more fun...”

“Again?” yelped Al.

“Oh yeah,” said Dash, as the girls approached their respective boyfriends. “And again, and again, and again...”

Author's Note

This story was a commission! If you want one of your own, see my commission policy and prices here. I can also be reached at massdriver77 {at} gmail {dot} com, or on Discord at MassDriver#3858.

I've also set up a Ko-fi! If you want to support my work but you're not looking for a commission, it's a great way to leave a tip!