The sun beats down from above, brushing warm hands over Leo's scales and skin. He squirms in his restraints, trying and failing not to feel like he's caught in a massive spotlight. The bark of the stump scrapes against his skin--against his cock, still sensitive and exposed, a bit of ribbon tied around the length to prevent him from pulling it back in. 
He knows they chose this spot on purpose. He'd been led blindfolded through the woods for what felt like hours, Usagi's hand firm on his arm, Raph's warm and possessive on his ass. They'd bickered about which spot was bright enough before finally settling on one that left Leo feeling drenched in light, even if his vision was still shrouded in darkness. 
The way they've got him strung up, his ass is sticking slightly into the air, giving any passerby a real good look at the massive plug Raph had brought from home. It forces his tail up out of the way, leaving him so damn exposed Leo swears the sun is touching his inner walls. 
Their combined skill with ropes has left Leo unable to wriggle so much as an inch to the left or the right. He could get free, maybe, but only without some pretty extreme self-injury, and then they'd just need to follow the blood trail. 
And--and the thought of being chased through the woods, pursued, hunted, of being pinned down no matter how hard he tries to struggle and punished brutally for his efforts...well. It makes his already aching cock swell a little, his chin digging into bark as Leo bows his head. 
Raph and Usagi had left after tying him down, with Raph delivering a final smack to the plug, "To make sure it don't fall outta that loose little hole a'yers." Then they'd strolled off together, arm in arm for all Leo knows, talking and laughing like two friends on holiday. Leaving Leo tied down here, abandoned, trapped, and so, so visible. 
In the city his senses are fine-tuned; he could navigate from one end or Manhattan to the other blindfolded. But he's off-balance here, senses distorted by the smell of earth and plants, by the distant chitter of animals, by the hum of the wind in the trees and the constant distraction of the sunlight. 
Not to mention the ropes, the pressure, his aching cock, the faint scent of his own arousal clogging the air. Not to mention the gag in his mouth, so large that it keeps drool clustering at the corners of his mouth and forces him to keep his mouth relaxed, loose, ready. 
Leo doesn't know how close they are to the road. Anyone could come along and see him, a lone wanderer or a peasant on his way to market, an arrogant samurai, a noble in procession, a whole pack of warriors. 
They'd draw closer, curious, and they'd snicker to themselves at the ridiculous sight, maybe, and they'd want. And then there wouldn't be anything or anyone stopping them from putting those wants into action. 
He's not in any danger. He's pretty sure he's not, anyway. They're probably close enough to watch and smirk at him, and isn't that a fascinating mental picture...but seriously. They're close by. Right? 
Leo presses his chin to the bark, takes another deep breath. He's doing his best to steady himself, to meditate, and so far it's not going very well. Ninja aren't meant to be trapped in the daylight like this, aren't meant to feel so seen, and it's got him all at off balance. 
Steady, he tells himself, taking rough breaths through his nose. Steady-- 
Predictably, that's when he hears something break in the woods. He can't even tell himself it's probably just a squirrel or something before he hears another break, and another, the unmistakable sound of someone crunching carelessly through greenery. 
The others had been quiet as shadows when they left. Boisterous and used to the city as he is, Raph knows how to be silent in the forest. And Usagi may be a samurai who hates the idea of melting into the dark, but even he knows the value of stealth at times, and he's certainly grateful enough for this. 
Leo can feel eyes on him, burning into his skin, and he flushes. His traitorous cock stiffens at the attention, at the weight of his own helplessness. Crunch crunch crunch echoes around his head, almost painfully loud in his ears. 
He listens more closely, and--yes, now he can hear two sets of feet. Neither of them is loud enough to shake their earth, and there's no hissing or styling of feathers. It could be Raph and Usagi--unless it isn't. Or unless they're watching nearby, fascinated by whoever's being drawn to Leo like a moth to a flame. 
They've talked about that before, haven't they? Passing Leo around at inns, letting strangers touch instead of simply looking. Discussing much they could make from his ass and mouth, or what it would be like to sell him to a brothel and visit him later. See him debauched, helpless, used by strangers. 
Shadows looming over him, blocking out the light a little, although Leo is pretty sure that his assets are still very well lit. A snort of derision, too low and quick for Leo to calculate how it is. He wriggles again, a last-ditch effort to get free, and there's another voice letting out a low whistle of admiration. 
Leo twists his head in a futile attempt to get the blindfold off, growling through the gag, and-- 
Smack! He jumps as two hands come on his backside, one grabbing each cheek and squeezing painfully hard. They let go, only to come down with another smack, this one jarring the plug. Leo lets out a soft whimper, heart skittering in his chest. 
Smack. Smack. Smack. The spanking keeps up, moving so quickly and brutally Leo doesn't even have time to count the fingers. His ass grows painfully warm, and no doubt as red as his face. They hurt his tail again and again, yank and twist it until he's crying out with something he can't convince himself is simply pain.  
His cock is swelling between his legs, and every once in a while they hit that too, leaving his head spinning with the pain. There's no time to breathe, to recover; he's pretty sure there are more than two hands hitting him right now, striking him what feels like everywhere at once so that all Leo can do is jerk about helplessly. Smack. Smack. Smack-smack-smack. 
They stop and start a few times, just because they can. Some of their blows are so hard it drives Leo's chin deep into wood--he's going to be picking Splinter out of his scales for ages. Sharp nails rake across his buttocks and he lets out a tortured whine, unable to keep an overwhelmed tear from spilling down his cheek. 
The rustling of cloth behind him is the only warning that things are about to change. One minute there are hands coming down on his rear, and the next his plug is being abruptly, painful out, with a cock shoving abruptly into his hole. Leo's slick enough from the morning's debauchery and relatively well stretched, but he's given no time to adjust, and it hurts like fuck. 
He groans, shuddering helplessly, and whoever's currently up his ass lets out a soft sigh. They reach down to tug on the ribbon, pulling at the raw and aching surface of his cock in time with their steady thrusts. 
They're slow, painfully slow, and Leo can't help but churr with need, thrusting his hips back before he can stop himself. He receives a condescending pat on the ass for his efforts, followed by another painful squeeze. 
Another hand grabs his other butt cheek, and Leo can feel them pulling his cheeks part. He realizes what's happening right before a finger thrusts into his hole, rough and greedy, digging, digging, searching--he whimpers as it brushes that tender place inside him, knees quivering against the grass. 
They're not using his mouth, then. Smart. With all they've put him through so far, he's in a mood to bite first and ask questions later. Only--only they've never done this before, and he doesn't know whether it's fear or exhilaration that sends his nerves buzzing at the idea. 
They're the sound of someone spitting, and then there are more fingers, slicker now, pulling and stretching. Leo moans in pleasure pain, eyelids fluttering behind the blindfold as his poor cock desperately ruts against the stump. Somebody pulls hard on the ribbon around his cock and he lets out a choked sob, head going light. 
Whoever's currently fucking him picks up the pace just a little, hands brushing down Leo's trembling sides. The touch is so light, so gentle, and maybe that means it's Usagi, but perhaps it's just a stranger taking pity on the wanton little thing. 
The second cock takes its time sliding inside, at least, nudging and pushing at his stretched inner walls. Leo feels like he's being unfurled like a flower, the last of his defenses being offered up to the daylight with an ease that should probably be embarrassing. 
But Leo can't really bring himself to care about that, because suddenly the cock slides home and he's full, stuffed in a way he's never been before. They've both pressed up against his spot now, sending his veins screaming with a terrifying want. He churrs desperately, pitifully, humping the wood like a beast and not even caring how badly his dick is going to be scraped up by the end of this. 
Then they start to move, one going in and the other going out, and--well. Leo can't help himself, and the ribbon proves less than helpful. He comes all over the stump, seed spilling down his shaking thighs as a drawn-out wail tears free. 
They don't stop to acknowledge that. On the contrary, it's like a starting gun: they're slamming in and in like pistons, rocking Leo back and forth so that his oversensitive cock feels like it's been dragged over nails. He’s twisting and wriggling like a slut in a desperate attempt to get free, get more. 
It's the speed he so desperately craves, spiced with the casual brutality of strangers. They don't bend to kiss or even bite him, just keep thrusting away like they're playing with a piece of meat. 
The gentle hands on his side have turned into a crushing grip, while more fingers rake across the back of his neck, his thighs, his poor throbbing ass. His stomach is scraping painfully against the top of the stump and his cock is getting hard again, helped along by rough and eager hands. 
He starts sobbing around the second orgasm, and they don't care. They just keep going, ravaging Leo until it feels like they're leaving a permanent imprint in his body. He's going to feel them inside him every time he sits or stands for the rest of his life, and that prospect should feel as ridiculously good as it does. 
Leo's so gone at the end he can't even tell which one comes first. He just knows that one soon follows the other, their pleasure burning through his guts. The sensation is enough to drag him through one more nightmarish orgasm, so terrible and beautiful the world flickers back for a second. 
From a distance he can feel them pulling out one by one, leaving the seed to dribble down his thighs and stain the grass. Leo lies stiff and limp against the stone, eyes closed, trembling like a leaf in the wind. The sunlight is almost comforting now, a bit of warmth to keep him together. 
The ropes come off one by one and he's hoisted into someone's arms, reaching out to cling on for dear life. "Easy," Raph says, and Leo almost sobs with relief
(he knew they were there, but he didn’t know they were there, and everything huts and he loves them so much and–) Fuck it, he sobs anyway, and Usagi bends to gently kiss the tears away.
"You did so well, Leonardo," he says, tugging off the gag, the ribbon, and finally the blindfold. Leo blinks up at them, sparks dancing before his eyes as he adjusts to the light. 
"Let's take ya to the springs, getcha clean," Raph murmurs, hoisting Leo up. "You did good, bro. You did good." 
"We never left," Usagi says firmly. "You understand?" 
"Mmph." Leo nods, snuggling up closer to his brother. He rests his head on the crook of Raph's shoulder and lets his eyes drift shut.