Body Heat [NSFW]

This one goes out to Hotshott with a big happy birthday!! <3 I hope you enjoy!

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"Kacchan, please," Izuku choked out between chattering teeth, his fingertips numb where they clung to his sodden arms. "Let's just wait until morning."

"You wanna stay out here for the entire night? You'll fuckin' freeze to death, dumbass."

"M-Maybe we can find shelter somewhere," he suggested, sniffing hard. "Under some trees?"

"Just... Fucking follow me, alright?"

Izuku stumbled on his rapidly numbing feet but followed all the same, always at Katsuki's back, just as he always had been. Children playing in the park, teenagers duking it out to become the best, and pro-heroes climbing the charts – he'd always been a step behind, trying to catch up.

"Look," Katsuki grabbed him by the arm, dragging him off through the trees, hurrying toward some blur in the distance. "It's a fuckin' house."

Izuku wondered if maybe Katsuki was seeing things, if maybe it was some kind of mirage brought on by their exhaustion and the frozen rain, but as they drew closer he saw a dark shape take form through grey torrents.

"Bit shitty," Katsuki snorted, yanking the front door open without bothering to knock. "Probably leaky as fuck."

The house was only two rooms – a tiny cottage in the middle of the empty woods, maybe a home for woodcutters at some point in its long lifetime. The wood was old and creaky, cracked through in places and moldy in others, but other than a few stray drips it was still a roof over their heads.

Izuku shivered all the same, soaked through to the bone by the sudden downpour. They hadn't expected it to get dark so quickly as they made their way through the thick forest, let alone expected the change in weather. It was meant to be spring, but the sudden storm was colder than the middle of winter, and Izuku had been woefully unprepared.

It was supposed to be a simple little stake-out, watching a criminal base and taking notes on their activities. Turning into an all-out war had not been in the job description, but after a grueling fight they'd managed to come out on top. They'd brushed the police off, when they offered the heroes a ride back home – it was still daylight, after all, and they should really stay and make sure no one else showed up to the building that had so recently been demolished – exploded, was probably more accurate.

Who was to know that they'd get themselves lost in the dark forest and wander in circles for hours trying to find their way to the road?

Okay, they probably should have thought of it when they decided to go straight through the woods rather than follow the pointless twisting and turning of the road, but it was too late for that now.

"Take your clothes off," Katsuki instructed, as he rummaged through empty kitchen cupboards, hunting for any kind of supplies that might help them out. "You'll freeze if you sit around in wet clothes."

"B-But- I don't h-have-"

"You'd rather freeze to death than let me see your junk?" Katsuki asked stubbornly, stripping his shirt over his head. "I'm taking mine off too, asshole. Nudity is better than hypothermia. Keep your damn wet boxers on if you're so concerned, just be prepared to lose your dick to frostbite."

Izuku nodded, swallowing hard, and with trembling hands he peeled away his heavy, drenched layers.

Katsuki finally gave up on the cupboards with their rusted hinges and rotting wood, conceding that the place had been stripped bare when the occupants left. With a sigh he shed his pants, contemplating their surroundings.

"Go up there," Katsuki instructed, nodding toward a little wooden ladder that led up to a loft. "Check if it's dry, and see if there's anything up there we can pilfer."

"Okay, Kacchan," he mumbled, his sodden boxers still clinging to his legs. "What about you?"

"I'm assuming this is a bathroom," he waved toward a little door, hanging off its hinges. "If it is, I'm gonna take a piss. If not, I'll see what it is."

"Okay."

They parted ways, and Izuku climbed up the ladder, shoving wet hair back from his face to investigate. It was dark and dusty - even darker than downstairs, though he'd never have thought that possible - and he paused for a moment to let his eyes adjust – praying that they would adjust, at some point.

Sure enough, he soon began to discern shapes, and he climbed a little further to look. He could hear dripping again, though maybe not as much as in the kitchen and living area, and he couldn't seem to find an actual source as he crawled around on all fours.

When the dripping stopped, he felt his cheeks flush, realising far too late that it was Katsuki he could hear, not the rain getting through. On the plus side, that meant the room might be dryer than the downstairs area had been, but on the downside, it meant he'd been listening to Katsuki pee, and that wasn't a great feeling.

"Oh," he blurted out, when he forced open an old closet. "Really?"

As old and worn as it clearly was, he was still surprised and a little pleased to find a musty-smelling futon folded away, as if someone were planning to return at any minute. He dragged it out without bothering to wait for Katsuki, finding a few holes here and there, but somehow no bugs, only the tiniest hint of mold along one seam, and no villain waiting to jump out at them from the darkness.

That last one was probably less concerning than it needed to be.

"Kacchan," he called, when he heard the crooked door creak open below him. "I found a futon."

"Haaah?"

"I don't know," he shrugged, watching Katsuki's face pop up at the bottom of the ladder. "It was just in the closet. I think it's dry up here."

"Move your ass over, I'm coming up."

Izuku shuffled over to one side, making room for Katsuki to join him, and together they stared dumbfounded at the soft bedding. When Katsuki reached into the closet, rifling around with much more courage than Izuku had contained, he managed to unearth a worn out blanket, shaking it out with a breathy little huff of laughter.

"I guess you get to be comfortable and cold, while I get to be warm and in pain."

"Kacchan," Izuku said softly, "Come on."

"Yeah, yeah. Don't start with me, nerd."

He set the blanket aside, grabbing one end of the futon to help Izuku lay it out, and pulled a face as he threw the single blanket over the top.

"We never speak of this again," Katsuki said sternly, as he shed his underwear in the darkness. "Take your damn shorts off, I'm not sharing a bed with your swamp ass."

A little braver in the darkness, Izuku nodded, casting them off and letting his cold dick hang free. He couldn't really see Katsuki's, with the lack of light, so he could only hope Katsuki couldn't see his either.

"Should we hang our clothes up?" he asked quietly. "Maybe they'll dry a little."

"Ugh," Katsuki huffed. "Yeah, probably."

One by one they climbed back down the ladder, careful not to look at each other as they gathered their things and hunted down places to hang them. Cupboard doors became the prevailing option, hooked over the top and jammed closed to hold, and Izuku felt himself blush when his stomach rumbled.

"I didn't bring food," Katsuki answered, before Izuku could even open his mouth. "There's a pump in the bathroom if you want water."

"Thanks."

Izuku ducked past him, closing the little bathroom door and searching carefully through the darkness. He relieved himself first, when he found the hole in the ground surrounded by a little wooden platform, washed his hands as best as he could with a hand-powered tap and no soap, and then stuck his head under the tap to drink. It wouldn't fill his stomach, by any means, but hydration and hunger was miles better than dehydration and hunger.

"Alright, nerd," Katsuki called, when he opened the door again. "Get your ass up here."

Izuku nodded, even though Katsuki wasn't looking, and began his slow climb to the top. His hands were still burning with cold, and frankly he was willing to do anything, at this point, to make sure he wouldn't lose his fingers by morning.

"C'mere," Katsuki instructed, pulling the blanket aside, next to where he already lay. "Don't make this weird."

"It is weird," Izuku complained. "We haven't shared a bed since we were six, and never naked. I know we need to, but that doesn't mean it isn't weird."

"Point taken," Katsuki scoffed. "Whatever. Get under the blanket."

Izuku crawled in beside him, tucking the blanket around him, and when his hand brushed Katsuki's side lightly he opened his mouth to apologise.

"What the fuck," Katsuki demanded, before he could manage the words. "You're a fuckin' icicle."

"I told you I was cold," Izuku pouted. "What am I supposed to do about it?"

"Fucking idiot," Katsuki growled. "How are you gonna fight if you lose your fingers?"

"It's not my fault."

To Izuku's disbelief, he felt a slightly less cold arm wrap around him, dragging him in close, and Izuku went as stiff as a board, dead still in Katsuki's grip.

"Fuckin' relax. Gotta conserve body heat and shit."

"I don't have any to conserve."

"Exactly. Idiot."

Slowly and awkwardly, Izuku let himself relax a little, softening into Katsuki's grip and draping an arm over him lightly. To his surprise, Katsuki didn't complain, holding him closer and letting him share what little warmth he provided.

"Still cold," Izuku grumbled, ducking his head to press his nose to Katsuki's shoulder, stealing the tiny spark of warmth in his torso. "So damn cold."

Katsuki sighed faintly, picking up the hem of the blanket and pulling it over their heads, bearing down on them with a comforting weight. Izuku's breath bounced back off Katsuki's shoulder, warming his face a little, and he hummed contentedly as he slowly regained a little feeling in his extremities. He still shivered, still clung to Katsuki desperately, but he no longer feared his fingertips falling off at any second.

When their hips brushed together, he felt his cheeks burn red, unable to keep the thoughts from flooding his mind: Was Katsuki hard in front of him, or was he just huge? Shouldn't he have shrunk in the cold? How could he possibly be so big that it still felt huge even in the cold??

"Oi," Katsuki growled. "Either cut it out or use your mouth like a big boy."

Izuku realised far too late that his thigh was rubbing between Katsuki's legs, exploring the area, trying to determine exactly what was going on between his legs. He stammered over nonsensical words, unable to form a coherent sentence, and even in the dark he could see Katsuki smirk.

"What, you wanna fuck?" he sneered. "Newsflash, dumbass, I didn't bring lube when I left my clothes and food behind."

"N-No! Of course not!" he forced out in a hurry, starting to wiggle away but halted by Katsuki's massive biceps. "Don't tease me, Kacchan!"

"You think I don't know?" Katsuki continued, his tone eerily calm. "You think I don't see your ass perving at me every damn day of our lives? You've been doing it since high school, I'm not an idiot."

"S-Sorry. I just- You-"

"I'm hot, I fuckin' know," Katsuki snorted, shifting his hand down to grip at Izuku's ass. "Your nerdy little ass is finally starting to look alright too."

"Um, th-thank you?"

"We're grown adults," Katsuki pointed out. "If we wanna screw around a little to heat things up in here, no one is gonna stop us."

"Y-You would really c-consider that?"

"If you want," he shrugged. "Wouldn't suggest it if I was gonna turn around and say no."

"Y-Yeah," Izuku nodded swallowing hard. "What do you want me to do? Suck you off?"

Katsuki rolled onto his back, dragging Izuku on top, and they both shivered when a burst of cold air invaded their blanket cave.

"That won't get you warm," he pointed out. "How 'bout you see if you can get us both off like this?"

When Izuku shifted his hand, Katsuki grabbed it, dragging it back up to their shoulders.

"Hump me like a desperate little whore," he smirked. "Get your blood flowing."

Izuku nodded, shifting his knees to get some balance and leverage, and as he shifted his weight, dragging their cocks against each other, his breath caught.

"Little virgin," Katsuki teased, tangling a hand in damp green curls. "Too much already?"

"So are you," Izuku huffed, starting a slow rhythm up and down against Katsuki's crotch. "I know you, Kacchan. There's no way you've had sex yet."

"That's none of your damn business, now, is it?"

"I know the answer, I'm not asking for one."

When he got the hang of the motion, Izuku began to move a little faster, and when Katsuki stopped teasing he knew he was doing something right. Feeling bold, he leaned his weight on one elbow, shifting his other hand to Katsuki's chest.

Red eyes watched him cautiously, but made no move to stop him, back arching a little to press tighter into Izuku's motions. Izuku's hand stroked along the smooth curve of Katsuki's pecs until his thumb and finger encircled the pert nipple, pinching just lightly, and Katsuki moaned.

"You like that?" Izuku teased. "Who would have guessed?"

"Shut it," Katsuki huffed, writhing when Izuku pinched harder in response. "Fuck!"

Izuku grinned, humping a little quicker as he dropped his head, biting lightly at the other nipple to hear Katsuki moan. Katsuki was definitely hard, and had been for a while, from what Izuku could tell. It was good to know that they'd both been affected by their naked snuggle, rather than just Izuku with his stupid childhood crush.

"Kacchan," he moaned, lapping at his nipples. "Feels good, Kacchan."

"Keep going," Katsuki answered breathlessly, nodding. "Make me cum."

The thought hit Izuku all at once, and his pace stuttered, slowing off a little. Katsuki loosed a cute little whine at the lack of stimulation, and Izuku thumbed over his nipples in apology.

"Kacchan, we have nothing to clean up with," he pointed out. "No towels. Not even any water, really."

"Fuuuuck," he moaned, throwing his head back. "God damn it."

"You want me to swallow it?"

The room fell silent, the words somehow so surprising that even Katsuki didn't have a stubborn retort for them.

"Really?"

"Yeah."

"Fuck yeah."

Izuku slid down further under the blankets, quietly pleased by how toasty warm it was becoming with their motions, his feet no longer numb even when he accidentally poked his toe out the bottom of the blankets.

Katsuki shifted a little, sticking his head back out the top and curling over slightly, giving Izuku more room to move beneath the covers, and when Izuku wrapped his fist around Katsuki's swollen shaft he heard a little gasp come from up above.

"Feel good?" he grinned, sticking his tongue out and lapping at the tip, feeling Katsuki's thighs tense in front of him. "You gonna be able to hold it?"

"Shut up, nerd."

"Is this your first time, Kacchan?" he asked knowingly, taking another long lick and tasting precum on the skin. "So really, you're the virgin here."

"Shut up."

"Make me."

Katsuki bucked his hips forward knowingly, and Izuku giggled, wrapping his lips around just the head and sucking lightly. Katsuki moaned again, trying to thrust in, but Izuku held him off with ease. He sank a little lower at his own pace, swallowing Katsuki down, and Katsuki finally calmed down, forcing himself to stay still and let Izuku do the work.

"Fuck," Katsuki hissed, tangling his fingers in Izuku's hair. "More, Deku."

Izuku didn't bother to respond, other than upping his pace a little, sliding back and forth along Katsuki's shaft and swishing his tongue from side to side. He could feel it throbbing, could feel Katsuki breathing hard, and when the grip on his hair faltered, he knew.

He sank in deep, moving his hand away to swallow him right to the base, and with a long moan Katsuki came. He shot bursts of hot fluid down Izuku's throat, and while he'd normally be a little put off by the feeling, he kind of liked the warmth it filled him with. When the fluid stopped, he licked off the last of the droplets, amused by Katsuki's little whine when he touched the sensitive tip.

Smirking, he popped up to see Katsuki's exhausted face, giggling at the way Katsuki punched him limply.

"Don't look at me like that, nerd," he grumbled. "Uh, are you warmer now?"

"Yeah, a bit, but I'm super hard," he grinned, ducking his head to Katsuki's shoulder again. "You warm?"

"Yeah," he nodded, gently pushing Izuku's head away to duck under the blankets. "Okay, one sec."

Izuku was honestly a little surprised when Katsuki went straight to his crotch, licking a long stripe down his cock, and he moaned when the hot tongue flicked back and forth, teasing him. Katsuki seemed satisfied when he heard the sound, rewarding him with a swirl around the tip, continuing when the little whimpers fought their way out of his mouth.

"Good," Katsuki praised, a little awkwardly. "Let me hear it."

Something about the way he said it made Izuku moan again, and Katsuki licked a little harder, finally taking the head into his mouth.

He was a little rougher than Izuku, more demanding with his tongue and his touch, sucking a little harder and occasionally grazing him lightly with threatening teeth. Everything about it, though, was so damn hot, and it was all Izuku could do to hold himself back, to keep from coming then and there and splashing it all over Katsuki's pretty face.

"More, Kacchan," he insisted, struggling for air to choke the words out.

Katsuki responded by looping an arm around to his ass, digging his nails in just a little, giving Izuku a sharp little sting that loosed a desperate, strangled sound from his throat. He tangled both his hands in Katsuki's hair, desperately tugging him deeper before he could think better of it, but Katsuki moved with his touch, taking him in like it was no big deal.

"Kacchan, you're the best," he gasped. "Holy shit."

"Damn right I am," Katsuki chuckled, popping off for just long enough to tease before he sank back down again.

"Gonna cum, Kacchan, oh christ, I'm gonna cum so hard."

Katsuki's only answer this time was a hard swallow, his tongue pressed against the bottom of Izuku's cock, tip flicking in tiny motions at the base. Izuku couldn't hold it any longer, a dam bursting inside him that sent a flood of cum down Katsuki's throat, and he was both concerned and a little proud of himself when Katsuki spluttered.

Determined as always, Katsuki forced it down, and Izuku realised too late that he was stroking tenderly at blond spikes. Katsuki didn't complain, though, didn't shove him away, just paused for a moment to gather himself before he gently pulled away from the touch and shimmied back up to meet Izuku's eyes.

"Warm?"

"Yeah," Izuku grinned, shifting his hand to sit on the small of Katsuki's back. "Stay close, we want to keep this warmth all night."

"Whatever, nerd."

He didn't complain when Izuku tucked the blanket right up to their chins, even accepted the touch when Izuku tangled their legs together, holding him just as tight in return.

"Go to sleep, it'll be a long walk in the morning," Katsuki mumbled, eyes already closed. "Easy, with daylight, but long still."

"Yeah," Izuku nodded. "Get some rest, Kacchan."

Limbs entwined, they drifted off in a hurry, and Izuku was pretty sure he wore a smile on his face every minute of the long, cold night.

When morning came, light slipping through the worn wooden walls and casting stripes of gold and grey on the blanket, Izuku hummed contentedly. He woke slowly, with Katsuki's head against his, his face full of soft hair that had gone flat on one side, where it lay squished against the futon.

"Morning, Kacchan," he smiled, when red eyes flickered open to meet his. "Sleep okay?"

"Could have been worse," he nodded, stretching out and shivering when the cold air hit him, "Fuck, it's gonna be cold as shit."

"Yeah," Izuku giggled. "But I can always warm you up again tonight."

Against all odds, Katsuki laughed at the suggestion, reaching up to push messy curls back from Izuku's face.

"In my bed, this time," he suggested. "It's a lot more comfortable."

"Is your apartment heated?"

"Of course it's fuckin' heated, nerd, I'm a fuckin' pro-hero and you think I wouldn't have a damn heater?"

"Okay, I'm sold," Izuku giggled. "But for now we should probably get going. Our clothes are gonna be cold too."

"Think anyone would be mad if we kept the blanket?" he asked, pulling a face. "We could keep it around us while we walk."

"Well it doesn't seem like anyone else is using it. We could always bring it back later."

"Yeah. Maybe leave some canned food behind."

Izuku's stomach growled, and Katsuki's immediately followed suit, dragging giggles from Izuku's lips.

"Alright," Katsuki yawned, sitting up and braving the chills. "Fuck it, let's run."

"Back to the hotel?"

"Yeah," Katsuki nodded, heading for the ladder and hunting down his clothes in the kitchen. "We'll get changed, grab something to eat, debrief with the agency, and stay here one more night to get a good night's sleep, then tomorrow we can come leave some blankets and food here, for the next people who get lost."

"You really are a hero," Izuku grinned, following him down through the house. "I'm proud of you, Kacchan!"

"Whatever. We're doing it in fuckin' daylight next time."

"Sounds good to me!"

With their damp, ice-cold clothes pulled back on, and the warm blanket wrapped around their shoulders, Izuku leaned into Katsuki's side for warmth. The sun was already high above them, its light and warmth barely permeating the thick canopy of trees, and in their awkwardly linked position, they began to jog down the shallow slope of the hill.

"Hey Kacchan?"

"What, nerd?"

"What if we don't find our way back?"

"We've got all day, we'll find a road at the very least."

"And then?"

"And then quirks."

"We'd better get running, then," Izuku grinned. "You're gonna need to work up some sweat."

"Race you, nerd."