Leaving the fairly secluded bench behind, Rumble stepped out into the center of the room in pursuit of Rainbow. When he did look around, realizing that everypony could see him fully erect, his cock glistening with his cum and Fleet’s fluids, he found he didn’t really mind.

“Rumble, they’re watching~!” Rainbow teased, looking back at Rumble. She was testing him, and was pleasantly surprised as he didn’t shy away. "Don’t you wanna go back behind the lockers where they can't really see us?

With his view no longer partially obscured by lockers, Rumble could see that Thunder was having sex with High Winds, who had apparently come in from the showers a few moments ago, judging by her damp two-toned cobalt-blue mane and greyish-gold coat. Thunder was laying with his back on a towel on the floor, High Winds mounted on him griffin-style, and she was riding his brother’s dick with as much gusto as Fleet had his. He also noticed that Misty was sitting on his muzzle and, judging by her expression, he likely had his tongue doing some rather nice things inside her marehood.

Didn’t Thunder cum in her earlier? Does that mean he’s eating his own...oh wow.

He turned back to Rainbow, shaking his head. “Hey, I just saw Soarin fuck Spitfire and cum inside her, and they didn’t care. I’m watching my brother eating his own cum out of his marefriend while fucking another mare, and they don’t care. So why should I care if anypony can see me satisfy you?” Rumble asked, amazed at his own bold words even as he spoke them.

“Now you’re gettin’ it…” Rainbow said, smiling proudly, “...it’s OK to enjoy yourself with us, and it's OK to watch others enjoy themselves, too, if everypony’s OK with it. Now, c’mon. Put it in me. I was keeping it nice and warm for ya while you filled Fleet up.”

Deciding to have a taste before he mounted her, Rumble stuck his muzzle under her flagged tail, licking along her slit and getting quite a mouthful of her arousal. He found her pussy tasted much like it smelled – dewy, with a hint of watermelon, as well as slightly salty and musky – but lacked that distinctly intense, deeply musky undertone of a mare in heat that Fleet’s did. Overall, he had to say he liked it, if not quite as much as a fertile mare’s flavor.

“C’mon, Rumble, you got your taste, now quit teasing…” Rainbow whined, winking her clit to the rebellious stallion and swaying her hips, “...I want you to—OOF.”

Instead of letting Rainbow finish her sentence, Rumble responded by rearing up and mounting her. She gave a soft grunt at the sudden weight on her back, locking her legs in place and extending her wings out for balance. “That’s it, kid...now stick it in…” Rainbow said, feeling Rumble’s flare tapping all over her rump, seeking her entrance, “...down…right…AH...riiiiight there…”

Sure enough, after only missing a couple times, Rumble’s flare pressed softly to Rainbow’s marehood, and all it would take would be a gentle thrust from either to put it in her. Moments later, Rainbow took the initiative, pressing back into him, feeling her arousal-slick lower lips easily part for him. As he felt her wink, he slid in effortlessly another couple inches, getting quite a contented groan from Rainbow as she was entered.

Wow, she may not be in heat, but damn is she tight! It almost feels like I'm in Fleet's throat again!

"G-hah, gosh you're tight..." Rumble said, getting a grin from Rainbow as she looked back at him, their hips working in tandem to draw him deeper into her slippery and pleasantly constricting depths.

"Well, you're pretty...big...too..." Rainbow said, though Rumble could tell she wasn't complaining. Instead, it was ecstasy for Rainbow to finally feel him inside after watching him bring such pleasure to her marefriend. To finally get a feel for the cock that made Fleet cum twice already, instead having to suffice with her hoof meanwhile.

Feeling a sudden surge of pleasure as his medial ring passed into her warmth, Rumble humped his hips forwards involuntarily, getting a soft moan from Rainbow as he felt his flare impact something. "I-is that your..." Rumble asked, feeling her squeeze down in reaction.

"Y-yeah, you're aaaall the way in me now. I'm a bit smaller than other mares in there," Rainbow huffed as, with a couple inches still outside her, she felt Rumble's flare kiss her tightly-closed cervix. Rainbow gave a little whimper as he bumped her furthest barrier, that strange yet so instinctively right feeling of her stallion bottoming out in her sending a thrill through her. "N-nope, you're definitely not tiny at all..."

After a short time of silence, Rainbow softly squirmed this way or that, seemingly testing how moving Rumble's horsecock around in her felt. Rumble enjoyed it too, getting a feel for the tighter mare's innards squeezing so nicely around his shaft, until she finally gave a soft, and rather adorable, squeal and her hips jerked back towards him. "A-are you OK?" Rumble asked, though given the fact she'd pulled him deeper into her instead of away from her hinted at how she was feeling.

"Ohmigosh yes! As much as you're stretching me, I think your ring found my G-spot already!" Rainbow practically cheered, slowly rocking her hips, keeping his flare bumping her cervix, and his ring rubbing that bundle of nerves within her that made her see stars each time it brushed over it.

Rumble had been holding still while Rainbow was rocking on him, save the occasional involuntary twitch of his cock inside her or gentle hump when it felt too good not to, instead enjoying the slow sliding and squeezes of her tightness over him, the feeling of her clit winking slowly as he allowed her to treat him like a living dildo.

"Well, what're you waiting for, Rumble? Give it to her hard!" Fleet said, meanwhile using a dildo she'd seemingly recovered from her nearby locker and putting it to good use. She held it in her wing as she slid it into herself again while watching her marefriend getting fucked, very much liking the feeling of how the flare of it compressed Rumble's cum deeper in her while spreading her open again, giving a pleased, shuddering exhale at the feeling of a womb full of stallion cum.

"Y-yeah, fuck me! I want it hard and fast...and don't you dare even think about not cumming in me."

Rumble took the mares' words to heart. He wasn't as eager as he had been the previous times, both because Rainbow wasn’t in heat, and because he'd cum twice already. Still, the pleasure was encouragement enough for him to rock his hips, and the lust-filled sounds coming from Rainbow only encouraged him to earn more.

"Ah...Rumble, you're so fucking awesome...faster!" Rainbow huffed out as he was kissing her between her wings now, the erect limbs quivering slightly with each thrust he gave into her welcoming body. She felt so full each time he entered her, then almost cried out at the emptiness that followed, only for that hollow to so swiftly be replaced with its natural partner once more.

"T-thanks, you feel great too," Rumble gasped back, although he couldn't help but feel that was an understatement. Rainbow was squeezing down on him like a pro, her extra-tight muscles clenching with almost as much dexterity as a wing, seemingly targeting all his most sensitive parts all at once. "H-holy shit, how are you doing that?"

"Lotsa p-practice with toys. F-Fleet keeps me busy, insatiable m-minx." Rainbow said, giving an amused chuckle, and getting a huff from Fleet in return.

"You're one to talk. You're the one wanting to mount and fuck me with a strapon every night, not to mention what you do to my wings!" Fleet said with a laugh, giving a grunt as she hilted herself with the rather sizable dildo she was playing with. "Not that I'm complaining..."

Wow, I'd love to see Rainbow fucking her like that!

"H-hah, much as I make you c-cum, I d-don't think you would," Rainbow said, before giving a moan of her own as Rumble hilted himself in her again and just as quickly pulled out, only to repeat with an even deeper penetrating thrust this time, "S-speaking of making you cum, c'mere, I think I can h-help you with that."

"Mmm, don't mind if you do," Fleet purred, getting up from the bench, dildo still hilted and clenched tightly in her marehood as she moved in front of Rainbow. Rumble watched as Rainbow took the base of the toy in her mouth, gripping it softly in her teeth as she pulled it out of her marefriend, her glistening fluids as well as a bit of his own off-white cum clinging to it.

Rumble’s next thrust drove Rainbow forwards, ramming the toy back into Fleet. Rumble couldn't believe how sexy that was, getting an overhead view as Rainbow licked away at her marefriend's vulva and clit while the toy was hilted in her. "Mmm, f-fuck me Rainbow..." Fleet moaned out, pushing her hips back as Rumble’s next thrust drove the toy into her again.

Rumble sped his pace up, getting a pleased groan from Rainbow as she arched her back and leaned back into him, taking him to her limit once more as her clit winked on his balls, pushing back as though somehow, impossibly, trying to take even more of him in.

As he kept up the pleasurable motions of rocking his hips into Rainbow, Rumble looked around the room again. His brother was mounted on High Winds' back now, thrusting away like a stallion possessed. And then their eyes met. His first instinct was to look away, but he saw a competitive glint in Thunder's eyes. He watched as he gave a rough hump into his mare, earning a long moan from High Winds, and gave Rumble a smirk.

Sensing the unspoken challenge, Rumble moved his hips so his medial ring ground over Rainbow's clit repeatedly, before eventually getting a pleasured cry from her as she shoved her hips back against him again.

Never thought watching my brother having sex would be so hot! And being watched making Rainbow moan, too...I’ve never felt this turned on before!

He watched as Rainbow slid the dong back in and out of Fleetfoot quickly, watching her wings trembling in pleasure as her marefriend pleasured her.

Deciding to up the pace again, Rumble felt his endurance beginning to falter, feeling a tightness growing in his pelvis as his throbs and spurts of precum into Rainbow's pussy grew more rapid. Judging by how often Rainbow was squeezing on him, how much wetter she was getting, how much her clit was winking and how deep she was keeping him, he figured she was getting pretty close too.

After a dozen more thrusts, Rumble felt himself flaring up again, the pressure behind his cock becoming almost unbearable, but he held it off. Looking back to Thunderlane, he could see his eyes were closed and he was pounding away at High, clearly nearing his own point of no return. As he watched his brother's hips lurch forward one last time, seeing his head jerking back, he realized he was watching his brother cumming inside his second partner of the night.

Ah...wow, that's really...

Seeing his brother claiming another mare was too much for Rumble, his hips jerking rapidly inside Rainbow as he felt her tense up. "Oh fuck yeeees!" Rainbow yelped, before Rumble heard her cry out in pleasure as she clamped down on his rapidly and rhythmically thrusting member, as that extra stimulation sent her over. Rumble sensed his own end abruptly approaching as he felt Rainbow milking him for his load.

Oh gods she's squeezing so tight...I can't...gotta...

"R-Rainbow...I'm gonna...gotta..." Rumble said as he rammed his hips into Rainbow as hard as he could, "...f-fuck...you're..." Rumble felt the end of her passage pressed firmly to his fully-swollen flare, plugging her walls to contain his load inside her, and finally it was too much.

"Yes-yes-yes-yes...d-do it in m-me..." Rainbow squealed.

Rumble reached down and bit Rainbow's crest as he burst inside her, feeling pump after pump of his cum washing into her womb, given how firmly he was pressed to her cervix. He felt swells of intense pleasure rush through him as he held deep in that kneading, warm mare-pussy, his cock throbbing rapidly as he shot his wad, doing his best to give his all to her too.

"O-oh s-shit...so waaaarm!" Rainbow cried out, the toy having fallen out of her mouth as Rumble started cumming inside her, her whole focus on that utterly fulfilling sensation of accomplishing her most base urges as a mare. She felt herself squeezing down involuntarily on Rumble's spurting cock from his base to his thickly-swollen flare, milking everything she could from him and feeling his thick, warm semen washing far inside her.

Rumble's hips kept gently thrusting on reflex, wanting to eek out the last of vestiges of pleasure he could as he felt himself rapidly reaching empty much faster than with Fleet, his last little spurts entering Rainbow before his final throbs were dry. His hips stilled as he rested his head on Rainbow's withers, both their chests heaving as they brought in much needed oxygen. "H-holy...shit..." Rumble huffed out when he'd recovered enough of his faculties to do so, still feeling Rainbow's passage gently rippling over him in aftershocks, "...so...so...good..."

"Mmmhm, I know I am. You weren't so bad either, stud," Rainbow said, squirming her hips, squeezing down as she enjoyed the feeling of Rumble's softening, yet still flared, cock still inside her. Her own orgasm had tapered off as his had finished, the outright grabbing contractions inside her reducing to gentle squeezes and ripples.

As Rumble grew too soft and soon slid out of her with a loud, wet schick, Rainbow let out a little whimper at the lost feeling of fullness, though not entirely so. As Rainbow squeezed down again without Rumble inside her, she could still feel all the cum he'd deposited inside her, a soothing sensation coming from her deepest animal mind at being cum inside like that. "Damn, you filled me up good."

"Hah, don't I know it. Those potions don't mess around, and neither does this young stud," Fleet replied with a chuckle, rubbing over her own belly as she felt the little bit of Rumble still left deep within her, compressed into her deepest depths by the dildo. "He really inseminates to impregnate, don't ya?"

Rumble blushed, still coming to grips with everything that had happened. He felt an instinctive pride at his performance, his animal mind thinking he'd bred at least one of the mares, even if he knew it wasn't so. As he glanced around the room, a sudden whinny caught his attention.

Rumble looked over just as Soarin hilted into Spitfire, giving a whinny of passion as he burst inside her again. Seeing how she was quivering, she'd probably finished not long before or after him. He could see Soarin’s balls twitching, what little of his shaft was still outside her twitching rhythmically as he came deep in her.

"Well, there he pops again. Wonder how much he's still got left in him after two shots..." Rainbow said, looking at Rumble, "...wonder how much you have left in you, too." As she heard a huff, Rainbow then looked to Fleet, finding her fucking herself hard with the toy while watching Soarin's nuts throb as he pumped his marefriend full of his sperm again.

Fleet was panting, her whole body quivering, before she let out a quiet yell as she tensed up. Rumble watched as Fleet's clit winked while she was spread with the blue silicone, her hips twitching and pussy visibly squeezing, the toy moving slightly with each contraction of her pussy around it.

Finally, with a contented sigh, Fleet relaxed and rested the back of her head on the bench, her chin facing the ceiling and ears folded back, a look of bliss on her face. As her eyes flittered open a few seconds later, she looked over at Rainbow and, without a word, Rainbow came to her and kissed her, a hoof gently caressing her cheek as they shared their affections.

All of the stimulation, from watching Soarin cumming inside Spitfire for the second time, to seeing Fleet cumming again, smelling her fertile scent intensifying as she had, had Rumble partially hard again in no time. As their kiss ended with a quiet click, Fleet's eyes met his, then quickly trailed down, seeing his partial erection hanging proudly. "Hah-wow, ready to go again, huh?" Fleet half-breathed, half-said, a tired smile accompanying it, "Yeah, I can go again. But first, I think I need to get you warmed up the rest of the way." Fleet stood, coming over to where Rumble had sat on the floor, before laying down beside him.

How is she still going? How am I still going? I heard mares in heat are crazy horny, but wow! I guess it helps that she's got a Wonderbolt's stamina too...

Rumble gave a soft gasp as he felt Fleet's muzzle at his balls, her nose gently lifting his heavy balls as she nuzzled his sack. Soon, though, she took one into her mouth, Rumble feeling a tingle of pleasure as his flagging body was coaxed to arousal once more. He was starting to feel tired, like he usually would after his first or second orgasm alone, but he knew he could go at least one more time. He felt his cock hardening again as Fleet moved on to his other testis, giving it equal attention to the first, before pulling off of it with a quiet pop.

As she gave Rumble's shaft a long, languorous lick along the bottom of his shaft from base to flare, Rumble still felt pleasure, still felt the desire to mount this mare in heat and give her another load into her warm pussy, but it was much more muted now after cumming three times already. His erection rose slower this time, needing more licks and kisses to get it up again. His stamina was waning even despite the potion, but he didn't want to leave Fleet unsatisfied, nor did he want to lose the opportunity to feel the pleasure of fucking her again while she was still in heat.

Rumble gave a soft gasp as he felt Fleet take his member into her muzzle again and slowly bob her head, swirling her tongue on his flare as Rainbow took Fleet's previous place at his balls, and soon he found himself fully erect again. Fleet slowly pulled her muzzle off of him with a satisfying pop, giving him a little smile, and stood before him.

Fleet flagged her tail and winked her clit at Rumble again, welcoming him to mount her just as he had mounted Rainbow, to mate her like their feral ancestors had. Her tail twitched as she flagged it just a bit higher, her clit winking as she intentionally kept it out for an extended time. Rumble watched as a drop of her fluids rolled down her lips, pausing for a moment on her clit, before dripping to the ground. "C'mon stud, how about one lap? Think you can do that for me?"

Author's Note

One last hurrah, Rumble. Think you've got it in you?