Even when he's facing away with his eye closed, even when the cacophony of groans and churrs around him (from him) has melted together, even when Leo's too lost in his own haze to pick out their individual scents, he can tell who's fucking him, and where.

Each cock that slides inside him is shaped slightly different from the last, and at this point Leo's so wrung-out and sensitive he feels the difference instantly. He can identify them by their taste as well, and soon enough he'll probably be able to tell apart the different sprays of come that whoever's currently out of the spit-roast rotation spills over his skin.

They fuck differently too. Mikey likes to spank Leo and play with his cock as he fucks, letting his playful spirit turn a little vicious. Raph is gruff and brisk, leaving bruises and bloody bite marks if he's not careful. Donnie's long, slender fingers are constantly in motion, forever drifting over Leo's body as they find new ones to undo it.

And Leo...Leo would like to pretend that he doesn't find himself arching into their touch, swallowing back moans until they eventually tear free. He'd like to pretend that he can just lie here, safely separate from everything around him, finding inner peace the way that he does so easily in the dojo.

But he can't. His biology won't let him.

"It's nothing to be ashamed of," Donnie had said all those years ago, when this had first started happening. They'd been thirteen years old, crippled by sweats and shaking and terrible dreams, dreams that were terrible in how wonderful they were.

He'd used the word "heat," talking about old instincts and residue from the mutation and so many other things no one had wanted to think about. He'd worked out something with Splinter's herbs and his own chemicals, something to help tame the urges if not quell them. They suffered through a few months of awkwardness, and everything was fine.

Only the heats kept coming back stronger, year after year. And then Splinter was gone, and Leo was sure he'd been making mistakes brewing the herbs, even when he followed Sensei's instructions to the letter.

Because it didn't seem to have any impact at all this year. They were all waking up from dreams that left them unable to make eye contact. Leo was aching everywhere, feeling sweaty and shaking and unusually anxious.

His brothers were...weird towards Leo, in a way they'd never been before. Giving him funny looks, brushing up against him for no reason and then jumping away like they'd been burned, popping woodies every time they sparred.

Leo had first considered the unthinkable after Donnie had nearly bitten April for patting Leo on the arm during a mission. He'd settled on it after Mikey and Raph had nearly strangled each other in an argument he's pretty sure started over who got to hand him a dish of peas at dinner.

He'd made a plan of it. He'd given some excuse to their friends, said they would be cutting off contact for a few days. He'd agreed to Donnie's enema, even thought it sucked. He'd even had them all take goddamn STD tests.

The only position he would agree too was over a secure bench Raph and Donnie installed in Donnie's room (they own they used the least, except for Splinter's, and there was no way in hell Leo was doing this there). He had this image of himself kneeling like a penitent, or in meditation, being cleansed even as he was defiled.

He told them to strap him down, even though he probably could have gotten out of the restraints easily (at least before the heat turned his brain to spaghetti) because he didn't want to feel les responsible for this. He could just lie there, let his brothers spend their desires, and then when they were done he'd get up and they'd never talk about this again.

"Sweet," Raph groans, nibbling at his neck. "So fuckin' sweet for us, babe." He reaches down to tug at Leo's trembling cock, and Leo lets himself make a long, soft sigh.

No plan survives contact with the enemy, his father had once said. But the enemy wasn't supposed to be his brothers, wasn't supposed to be his own body. He wasn't supposed to feel himself losing control like this. Wasn't supposed to enjoy it.

"So good for us," Donnie whispers, nudging his cock further between Leo's lips. It tastes so good; Leo's drenched in the sweetness, can't help himself. He hadn't intended to use his mouth at all, but now he's lapping and sucking to the best of his ability.

"Ya gettin' full, Fearless?" Raph purrs, running his hands down Leo's straining sides. "Nice and full of our come?" Oh God, yes, he is. They've been going at this for hours, way longer than any human can manage. He can't keep track of anybody's orgasms, but the leather underneath him is drenched, and his insides feels....stuffed.

Now that he thinks about it, he's exhausted, too, and sore is hell. But that strange, unnatural part of him the heat seems to have awakened relishes this feeling of being battered, used, worn out. He knows he shouldn't feel that way--it's not right for him, not Leonardo, the proud warrior, the leader, the jonin.

Knowing that doesn't stop a lifetime of self-control from disintegrating as his brother speaks. Leo pushes up with the last of his strength, swallowing up Raph's cock, drinking in his touch and his words.

"Yeah, you do," Donnie whispers, linking hands with Raph as they press against Leo's bridges. "Like being filled. You want to get filled with our babies, sweet thing? Wouldn't that be nice?"

Babies. That's been coming up a lot lately. They keep talking about how pretty he'll look when he's round and pregnant, how wonderfully plush he'll be. How he'll be so hungry they'll have to feed him as they fuck him, bathing his growing eggs in fresh layers of seed as they slip food between his lips.

It's a crazy callback to all the times they called him mother hen, and he tries not to consider the possibility that these desires, these fantasies, have always been lurking under their scales. Because then he'd have to confront the possibility that these things might be living under his scales as well.

Leo thinks about holding baby Miwa in his arms, cradling child Mikey, hell, even that stupid Parasitica egg. Remembers rocking his brothers to sleep when he was small and he was smaller, learning to speak as he babbled lullabies while they waited for Sensei to come home from scavenging and harvesting algae.

He always felt so warm then, so content, like all was right in the world. He imagines a child of his own swelling beneath his scutes, impossible as that is.

Like most of the things that he's feeling right now, it's insane, twisted, perverted. Like most of the thing he's feeling right now, it makes him want feel hard and horny and desperate with need all at once.

"Fill me." The words are muffled, but he knows they understand, knows from the way Donnie moans in his mouth as the words ripple along his length. Precome dribbles along Leo's tongue and he is so hungry for it.

"You'll swell up like a blueberry," and Mikey's here, now, kneeling by Leo's side and pressing soft kisses along his heaving shoulders. "We'll find the time to kiss every bit of new skin you get. We'll put you somewhere safe and soft where no one will ever hurt you." His voice trembles a little as he whispers, "We'll never lose you again."

He wants to sob at that. They've seen him nearly die so often, his brothers. His precious, precious brothers. And the fact that he would do it all over again to keep them safe doesn't make the guilt of almost leaving them time and again any less painful.

"Shhh..." Mikey whispers, touching himself as he bends to kiss under Leo's eyes. "Hush, it's all right. You're home now. You're gonna be such a pretty mama."

Raph lets out a loud churr at the words, and Leo gasps as his brother's hands reach down to fondle his cock and tail. He starts up a steady pace and Leo jerks, restraints creaking softly. His head is spinning with words like mama and pretty, words he should be disgusted, insulted by. He isn't.

"That's it," Mikey says. "That's what you need. Our perfect little mama. C'mon, sweetheart, show us how much you like it. How you need to carry our babies."

It's those words that pull him over the edge, and his brothers soon follow, all of them, wrapping Leo in a pearly white baptism. The world stutters under the white of their pleasure, their voices ringing so loudly he thinks his head might explode and all the fear and self-loathing might spill out, a perfect release.

From a distance he feels his brother's cocks slip out of him. No one reenters his aching hole, and he doesn't know whether to whine or feel relieved at that.

"We need to stop," Donnie says.

"Do we--"

"He's gonna get dehydrated, Raph." Donnie lets out a little giggle. "I didn't know we were gonna be at this so long." He brushes a hand down the back of his Leo's head. "You really are something, darling."

Then someone's pushing a plug upside him. Leo gasps, clenching around the intrusion.

"S'okay, Fearless," Raph murmurs, reaching over to undo the buckles. "Just keeping you nice and full, give our seed a time to settle." He seems to have calmed down a little--they all have, at least for the moment.

Donnie scoops him up and they carry him out of the bedroom, towards the living room. He's settled face-down onto the couch, eyes drifting over his skin. Leo blushes, feeling ridiculously self-conscious now that they're out of the safe shadows of the bedroom.

Someone dabs at his rear and he stiffens, pressing his face into the couch. "Cold...."

"It's okay," Donnie murmurs, rubbing Leo's thigh soothingly. "Just cleaning you up, trying to bring down the soreness." He rubs a bit more and it does start feeling better, actually. Nice and cool on his heat-ravaged flesh.

Donnie clucks his tongue, and Leo can tell he's spotted some of the bruises. "You guys are so rough."

"I'm fine," Leo mutters, driven by the old instinct to not seem lesser, weaker, capable of feeling pain. But then more words slip out of it. "It...it's good. I like it."

"Ya see?" Raph says happily. "Fearless knows what he needs." Leo hopes that's right.

"I've got some water," Mikey says, and then he's being helped upright. And they're looking at him, staring him in the face for the first time, really, since this all started. Their faces are flushed, their eyes are bright, and the weight of their gazes are too much to bear. Leo looks away quickly.

"Hey." Donnie reaches out and takes his chin, forcing Leo to meet their eyes again. "Don't hide." He smiles, and Leo is vividly aware about how those gapped teeth had felt sinking into his shoulder. "We want to see that cute face."

Leo bites his lip. "Leaders aren't cute," he says, so quiet he thinks he might be able to get away with them not hearing.

He doesn't. "But mamas can be," Mikey says, leaning forward to kiss Leo softly on the lips, brushing a soft hand over his stomach. Then Donnie kisses him, and Raph, both of them touching his plastron the way Mikey did.

It's the first time any of them have kissed him. He's still trying to wrap his brain around that when Mikey holds out the water. Leo sips carefully, trying to keep his hand and heart steady.

"You know," he says quietly. "I don't think I can actually be a, a mama."

"Maybe not right away," Mikey says. "I mean, we're working with crazy science stuff. We are crazy science stuff. Who knows?" He shoots a glance at Donnie, who shrugs.

"And it'd probably go easier if we start doin' this outside of normal heat cycles," Raph mutters, suddenly looking nervous.

Leo blinks. "Is that what you want?"

They all look at him. "Is that what you want?" Mikey asks carefully.

"I..." He thinks about what's it like to feel cared for, treasured. He turns the terror and wonder of submission over in his mind. "I don't know." He does, he thinks, he's just not brave enough to say it.

"Okay," Donnie says quietly. They sit and watch him drink in silence. With each sips he can feel their scents growing stronger again, feel the old aches creeping back. The heat's not finished yet, and he can admit to himself he's glad for that.

When he's done, Donnie stands up, and Leo doesn't ask questions as they walk back to the bedroom. Mikey walks besides him, tracing a hand over Leo's hip, palming his ass. "Would be nice, wouldn't it? One little egg for each of us. A loyal kid like you, a loud kid like Raph, a sappy kid like Donnie, a turtlely awesome one like me."

Leo rolls his eyes, trying to ignore how the word loyal makes his heart flicker. "I don't think I could deal with more of you guys."

"Oh, you'd love it," Raph chides. "Havin' a whole little army to boss around? That's one of your dreams come true right there." They all laugh at that.

They pass into the bedroom, but instead of heading to the bench Leo finds himself being guided to the bed instead. He looks around, confused. "I thought..."

"Not that you're not hot as fuck bent over that thing, but we wanted to try lookin' at ya," Raph explains, giving him a little push.

"That good?" Mikey asks. They're still looking at him, but their gazes don't feel quite as alarming as they did before. Still, he thinks he might need something else.

"Can you, um...." He turns, awkwardly stretching his hands behind his back and pushing his wrists together.

They don't need anything more than that, thankfully. Donnie finds some rope in the corner and they bind him before carefully pushing him onto the pillows. Raph and Donnie pushing up against him, devouring him with hungry kisses, while Mikey carefully pushes Leo's legs apart to pull the plug free.

"C'mon, mama," he purrs, carefully fishing out the plug and tossing it aside. "Let your daddies take care of you." And even with the heat swimming back over him, Leo wants to say something about how ridiculously cheesy that is, but Mikey's lips crush against his and he can't say anything at all.

He falls back and lets his family give him what he needs.