Werewolf Katsuki who lives in the woods behind Izuku’s house, and one day when Izuku is walking through the woods to get home from school (because it’s a shortcut), Izuku gets attacked and bitten by another wolf from Katsuki’s pack – he passes out from loss of blood, and when he
wakes up it’s to a warm sensation on his skin. It takes him a moment to realize that someone – no, /a werewolf/, is licking his wound. Izuku’s head is foggy, but his eyes blink open, meeting an intense, red gaze. Izuku holds the wolf’s stare until he passes out again, thinking
he’s going to die. Except, he doesn’t die, because he wakes up in his bed, and it’s dark out, so he knows a good amount of time has passed. Izuku shuffles out of his bed, checks the time to find it’s a little past 2AM. He’s half convinced the entire experience was a dream, but
when he lifts his shirt he finds that the wound is still there, now in much better condition. Izuku pokes softly at the skin, wincing as he makes his way to the window, searching for those red eyes. That wolf...the one who saved him...Izuku wanted to thank him, wanted to ask him
why. Izuku sighs, eyes trained out the window, a yawn making its way past his lips. Izuku takes a seat in his desk chair and waits, eventually falling asleep and waking to his alarm in the morning. He spends the entire day thinking about those red eyes, and when school finally
ends, Izuku takes his usual shortcut through the forest. Maybe he should be scared considering the fact that he’d almost /died/, but he’s too interested in the mysterious wolf who saved his life. Izuku makes his way through the forest, but there’s no sign of the wolf, or /any/
wolf. If not for the wound on Izuku’s stomach, he’d think he made the whole thing up. Everyday, Izuku walks through the woods, hoping he’ll see the wolf, and everyday, he meets nothing but disappointment. Sometimes, if Izuku looks out his window in the middle of the night, he
thinks he catches glimpses of those shining red eyes, but at this point, he’s not sure if it’s real or his imagination playing tricks on him. Eventually, he stops spending so much time obsessing over the wolf, though he doesn’t entirely let it go.
(Gotta clock in for work now but stay tuned for horny werewolf Kacchan)
Fast forward a few years – Izuku’s sixteen and in his first year of high school. He’s walking through the woods on his way home from school just like every other day. Comes home to a note on the fridge from his mom telling him she picked up a night shift. He grabs a cup of
water and makes his way to his room, eyes widening as he swings the door open to reveal a naked boy curled into a ball on his bed. At the sound of the door opening, the boy’s eyes shoot to Izuku, the cup of water falling from Izuku’s grasp as his gaze meets intense red eyes.
They’re the same eyes from all those years ago – there’s no way Izuku could ever forget. They’d been a recurring part of Izuku’s dreams ever since that day when he was a kid. Izuku’s mouth falls open, and he attempts to form words, but what the heck are you supposed to say when
the wolf who saved your life when you were a kid suddenly shows up in your room as a naked boy?! Izuku is at a loss. Before he can help it, his eyes drift to Katsuki’s crotch, mouth forming a small “o” at the size of the boy’s cock. /Wow/. Izuku lets out a breath and takes a
tentative step forward. He holds his hand out in what he hopes to be a non threatening gesture. “Are you...are you okay?” Izuku asks, hand hovering over the boy’s head. Blonde hair nudges into his hand, and then a body is slamming into Izuku’s, jumping from the bed so quickly
that Izuku barely has a chance to process it until his back is slamming against the wall, the boy’s face nuzzling into Izuku’s neck. Izuku’s heart stutters, something stirring low in his stomach. “Wha-what are you doing,” Izuku struggles to ask. Katsuki licks a strip down his
neck and murmurs “Deku” into his skin. Izuku blinks, trying to make sense of the strange name the boy had given him. “That’s—I’m Izuku,” Izuku says, but the boy shakes his head. “Deku,” he repeats, nibbling softly at his neck. “Saw it on your journal,” the boy says, and /oh/.
Izuku swallows, sucking in a deep breath. “You saved me,” he manages to get out after a soft whimper, the boy’s sharp teeth digging lightly into his skin. “W-What’s your name?”
“Kahmmggh,” the boy breaths, cutting off with a moan as his cock grinds against Izuku’s leg. Izuku’s heart beats rapidly in his chest, and he resists the urge to meet Ka...

“Kacchan,” Izuku says, and the boy—/Kacchan/ pauses, eyes meeting Izuku’s for a brief moment before
his mouth returns to lick at Izuku’s neck.

Izuku’s cock twitches, straining in his pants as Katsuki continues to rut against him, breathing heavily against Izuku and sucking marks into his skin.

Somewhere in Izuku’s mind, he registers the fact that letting a naked boy he
found in his room grind against him is a bad idea, but he lets that thought get lost in the fog, choosing to focus instead on the needy noises Kacchan keeps making. “D-Do you want—mmmnhhm, ah—me to take off my clothes?”

What the heck is he doing?! Offering to take off his
clothes for some wolf who saved his life when he was a kid, some wolf who’s apparently also a /human/, and a horny human at that. A voice in Izuku’s head yells at him to push Kacchan away, but when hands go to pull his shirt over his head, that voice fades to the back of his
mind. Kacchan tosses Izuku’s shirt to the floor, hands exploring up his chest. Izuku is weak to Kacchan’s touch, skin tingling as his hands move to undo his belt. Kacchan lets out a small growl, biting into Izuku’s shoulder – not hard enough to draw blood, but hard enough to
sting. Izuku groans, hips bucking into Kacchan as he struggles with the button on his pants. Kacchan licks at the skin he’d just bitten, and Izuku has to hold back a whimper as he finally gets his zipper down and shuffles out of his pants, cock hard in his black boxer briefs.
Kacchan drops to his knees suddenly, burying his face against Izuku’s crotch, and holy hell if that isn’t the hottest thing Izuku’s ever experienced. (Not that he has much to compare it to – the furthest Izuku had gotten with someone before now was kissing!)
Izuku moans as Kacchan’s cheek rubs against his erection, and then a tongue darts out to lick at him through his underwear. “Y-You can take them off,” Izuku says, cock throbbing in anticipation. He wants to feel Kacchan’s tongue against him without the barrier.
Kacchan grunts an acknowledgment, hands grabbing the hem of Izuku’s boxers and pulling them down. Izuku steps out of them with a shaky breath, now completely naked in front of this boy he’d basically just met. What was it about Kacchan that made Izuku throw common sense to the
wind? Maybe it was the fact that he’d spent years glancing out his window in the hopes that he would find red eyes – and now, after all that time, here he is. Izuku hadn’t expected the wolf who saved his life to also be a human who apparently wanted to fuck him, but Izuku
finds it’s a pleasant surprise.

Kacchan licks the tip of Izuku’s cock, causing him to throw his head back against the wall, his wince turning into a moan as Kacchan’s tongue slides across his length.

“O-Oh,” Izuku breaths, trying to keep his thoughts coherent.
“Feels good, mm, /a-ahhhhh/.”

Kacchan’s lips wrap around Izuku’s cock, taking him in easily. Izuku’s hips jerk without his permission, and Kacchan lets out a quiet growl, glaring up at Izuku.

“S-Sorry,” Izuku stutters, heart beating ridiculously fast.
Kacchan’s cheeks hollow around him, tongue swirling as he sucks Izuku’s cock.

“Aaah....haah, K-Kacchan, oh god.” Izuku is reduced to soft groans as Kacchan takes him in further. Izuku can feel himself getting close, and he attempts to tell Kacchan as much.

“Mmm, I’m—ah-haah—“
“Kacchan, m’close, /o-oooohhh/.”

Kacchan’s head bobs up and down, making no movement to pull off, and with a humiliated, pleasured moan, Izuku cums inside Kacchan’s mouth.

Kacchan swallows around him, and Izuku nearly loses the ability to stand on two feet.
Oh god. Izuku’s cheeks flush an embarrassed red. He’d lasted, what, thirty seconds? His shame sends flames of heat up his spine, but embarrassment quickly morphs into arousal as he watches Kacchan lick his lips, nudging his head against Izuku’s hip in an oddly affectionate way.
Izuku’s heart is slowly returning to a normal pace – or, as normal as it can be considering the circumstances – but just as his breathing evens out, Kacchan jerks up, hands grabbing Izuku’s wrists and dragging him forward, towards the bed. Izuku’s eyes widen, but he lets himself
be dragged. “...Kacchan?” Izuku tries, but the only response he gets is Kacchan tossing him onto the bed. Kacchan then climbs over him, lips finding skin as he sucks a mark into Izuku’s next, and then another, and then—

“Kacchan, st—/ah/—Kacchan, not so high, my mom might see.”
Kacchan pauses, blinking up at Izuku for a moment before he pulls away. Izuku’s about to tell him he doesn’t have to stop when suddenly there’s a finger rubbing at his hole.

“Ka—“ Izuku lets out a pained yelp as Kacchan attempts to shove the finger inside.
Kacchan pulls back immediately, eyebrows furrowing together in concern. Izuku’s heart dips into his stomach, and before he can help it, he holds out a hand. Kacchan rubs his head into it, and Izuku says, “We need, um, lube...for that. Just...wait one second.”
Izuku shifts further up the bed, grabbing the bottle of lube that he keeps in his nightstand drawer. He opens the bottle as Kacchan watches, slicking up one of his fingers and then bringing it to his hole and slowly slipping it inside in a demonstration. “See?” Izuku says,
making a show of moving the finger around. “It’s a lot easier like this, and um...it feels better, too.”

Kacchan watches with an intense gaze, and Izuku’s skin burns, his cock hardening against his stomach. Izuku lets out a deep, shaky breath as he pulls his finger out and
asks, “Do you wanna—“

Izuku doesn’t get a chance to finish that sentence, because Kacchan is pouncing on him, taking the bottle of lube from Izuku’s grasp and coating his fingers with it, just as Izuku had done. Izuku swallows, the realization of what’s about to happen hitting
him. He’s really about to lose his virginity. To a...a werewolf. Izuku’s eyes shift down to the scar on his stomach, the one reminder through the years that his near death experience wasn’t something he simply dreamed up. Distracted, Izuku doesn’t notice notice Kacchan move
until there are lips pressing against his stomach, kissing the scar Izuku had been staring at. Izuku lets out a quiet gasp, and Kacchan’s tongue darts out, licking at the skin in a way that could only be described as gentle. Izuku’s heart stutters as Kacchan pulls away, his hands
grabbing Izuku’s legs and spreading them apart. Izuku’s eyes stay on the boy as his finger presses against Izuku’s hole, pushing gently inside.

“Mmmmhh,” Izuku hums, earning a pleased grunt from Kacchan as he curls the finger inside Izuku’s ass, experimentally moving around.
“Feels good,” Izuku murmurs, cock now fully erect.

Kacchan lets out another grunt, and then he’s shoving a second finger inside, thrusting them both to the knuckle. Izuku lets his eyes flutter shut, hands resting above his head. He feels...oddly relaxed, considering.
Kacchan’s movements increase in speed, reducing Izuku to a breathy thrum.

“Kacchan,” Izuku rasps, and then again, “Ka-/ah/-Kacchan.”

Katsuki lowers his head to place a kiss to Izuku’s hard cock, and Izuku’s heart nearly leaps out of his chest.
“You can—ngghhh—put another—oh god—put another finger in,” Izuku struggles to get out, eyes opening.

Kacchan kisses the skin just below Izuku’s hip bone and adds a third finger, a groan escaping Izuku at the stretch. It’s not that Izuku’s never fingered himself before,
it’s just, he’s only ever gone up to two fingers, and oh god, Kacchan’s cock is /much/ bigger than the three fingers in his ass, and what if he can’t take it, what if—

Kacchan’s fingers assault Izuku’s ass with a rough thrust, the boy growling as he pumps his fingers inside
Izuku, once again lowering his head to Izuku’s crotch. Kacchan licks and sucks on Izuku’s skin as he stretches him open with his fingers, and Izuku finds that he’s too blissed out to worry about the size of Kacchan’s cock. Kacchan’s taking such good care of him – Izuku doesn’t
care if it hurts. He wants to take good care of Kacchan, too. Wants Kacchan to feel as good as he feels.

Kacchan continues to fuck Izuku open with his fingers, and he barely notices when a fourth finger slips inside along with the others, his hole fuller than it’s ever been,
but...it’s not enough, Izuku realizes. He wants /more/. Needs more.

“Kacchan,” Izuku breaths, “I want—“ a blush colors his cheeks and he avoids Kacchan’s eyes. “I want to feel you inside me.”

Kacchan’s teeth suddenly sink into Izuku’s skin, and Izuku lets out a yelp,
Kacchan’s fingers pulling out as he lifts his head lines up his cock with Izuku’s entrance, hungry eyes scanning over Izuku.

Izuku’s legs get pushed up, resting against Kacchan’s shoulders as he pushes slowly inside, a moan escaping Izuku.
Kacchan’s so /big/, but it’s /perfect/. It’s exactly what Izuku wants, so full and warm. Kacchan pushes in until his thighs touch Izuku’s ass, and then’s he’s pulling out just as slow, repeating the process a few times, groaning as he fills Izuku up with his cock.
“You can—mmmhhh—go faster.”

Kacchan lets out a grunt, hands moving to grip Izuku’s wrists as he jerks his hips in a quick thrust.

“Oh god, yeah, like tha—“ Izuku gets cut off with another thrust, hand clenching into fists as waves of pleasure turn is brain to fog.
“Kacchan mmfff,” Izuku moans, more pressure getting applied to Izuku’s wrists as Kacchan fucks him with a relentless pace. His cock throbs against his stomach, red and leaking. Kacchan’s grip around his wrists his almost painful, but Izuku finds he kind of likes it like that.
Kacchan’s groaning and panting, thrusts becoming erratic and animalistic. Izuku is reduced to strangled moans as Kacchan’s cock slams against his prostate repeatedly. He feels tears well in his eyes, because it’s so good it hurts. Izuku’s never been this stimulated before,
never been so close to cumming without his cock being touched. But oh god, he’s so close, and Kacchan’s so beautiful, and—

“NgghhhHHHH,” Izuku cries, cum shooting onto his stomach.

Kacchan lets out a feral growl and fucks Izuku harder, a few tears rolling down Izuku’s cheek,
overly stimulated. But /oh/, Kacchan looks so good, fucking into Izuku like he /needs/ him.

“Kacchan,” Izuku murmurs through a whimper, and two thrusts later, Kacchan is spilling into him, thrusts slowing as he shoves his cum further into Izuku’s ass.
Izuku whines, and Kacchan grunts, slowly pulling his cock from Izuku’s ass. Cum drips from his hole as Kacchan collapses onto his chest, Izuku letting out a soft yelp. “Ka—mmnfff,” Izuku cuts off, Kacchan nuzzling his head into Izuku’s neck, tongue lapping at his skin.
Izuku’s lets out a contented sigh as his eyes flutter shut, exhaustion settling in. He feels so warm with Kacchan on top of him, and he feels his eyes blinking shut, feels his arms wrap around Kacchan as the boy continues to lick him, tongue straying to Izuku’s face and
nipping at his cheek. Izuku hums contentedly, Kacchan’s head eventually settling into his chest.

***

Izuku’s jolts awake to a knock on his door. “Izuku, I’m home,” comes his mom’s voice from the other side of the door, and Izuku’s eyes widen in a panic, Kacchan growling
on top of him at the disturbance, attempting to nuzzle his head in Izuku’s armpit.

“Kacchan,” Izuku whispers with force, nudging Kacchan’s head with his finger. Kacchan snarls and sinks deeper into Izuku, clearly not wanting to be disturbed. “Kacchan,” Izuku tries again.
“My mom is home—I need to—AH, KACCHAN, no, /not right now/,” Izuku squeaks as Kacchan’s teeth dig into his shoulder and bite down not so gently.

“Izuku, is everything alright in there?” He hears his mom ask, and oh god, his door doesn’t have a lock, what if she opens the door,
how the hell is he supposed to explain this to her?

/Hey mom, meet Kacchan, he’s actually a werewolf. I almost died when I was a kid and I never told you about it, but don’t worry, Kacchan saved my life! Oh, why am I naked? Kacchan just showed up in my room and fucked me./
Yeah, Izuku doesn’t think that would go down well.

He pushes Kacchan off him with force, the boy growling in response as he’s rolled onto his side, glaring at Izuku. “What the fuck?!” Kacchan says, and oh god, that voice. So he’s talking now, apparently.
But Izuku doesn’t have time for that now!

“I’m fine!” Izuku yells at the door. “I’m just...changing. One second.”

Kacchan’s nose flares, glare deepening. Izuku glares back, because two can play at that game.

“Kacchan, can you just—“ Izuku looks around his room, eyes
landing on his closet. “Can you wait in the closet? Please?”

Kacchan huffs, but he moves from Izuku’s bed, slipping quietly into the closet and allowing Izuku a moment to breath out a sigh of relief before he makes his way to his dresser and tugs on clean pair of clothes.
“Hey,” Izuku greets when he opens the door, a yawn making it’s way past his lips. “Sorry, I—um, I fell asleep while doing homework.”

Izuku waves him off with a smile. “You remembered to eat dinner, right?”

“Um.” Izuku’s stomach growls. “Yeah...” He lies, “but uh, I’m
still kind of hungry. I think I’ll grab a snack and go back to studying....”

And by studying, he means dealing with the werewolf currently hiding in his closet.

“I’ll be in the living room for another hour or so,” Izuku tells him. “Don’t stay up too late, alright? I know it’s
not a school night, but still.”

Izuku smiles weakly. “I know, I know,” he says, and then he’s slipping past his mom and making his way to the kitchen, heating up left overs from last nights dinner.

Izuku’s stomach flutters with butterflies as he watches the food spin in the
microwave, absently tapping his fingers against the counter.

When the microwave beeps, Izuku lets out a sigh and heads back to his room, cautiously pushing his door open.

He’d half expected to come back to Kacchan sprawled out on his bed, but he’s relieved to find that the
boy had stayed put in the closet as Izuku had asked.

“Kacchan,” Izuku says softly, making his way to the closet and sliding the door open. Kacchan is sitting in the corner, holding one of Izuku’s sweaters to his face.

Izuku tries, he /really tries/ not to get turned on by the
sight, but there’s something about the possessive way Kacchan is clinging to Izuku’s sweater that has his cock twitching in his sweatpants. Izuku groans internally – he already came twice today, can’t his dick just chill the heck out?
Kacchan leaps up as soon as his eyes meet Izuku’s, tumbling onto him and pushing them both toward the bed, Izuku nearly dropping their dinner in the process.

“Kacchan!” Izuku squeaks, and Kacchan leans forward, crashing their mouths together.

“Ngghh,” Izuku groans, melting
into the kiss before common sense reaches up to him and he pushes Kacchan away.

Kacchan gives him a look that’s something between a scowl and a pout, and Izuku’s heart flops.

“I brought dinner...” Izuku says, holding up the container.
Kacchan sniffs, and then he’s snatching the bowl from Izuku and digging in with mouth, absolutely no manners.

“Kacchan, hey, /Kacchan/, that’s my dinner, too!”

Kacchan huffs out and grabs the utensil the Izuku holds out for him, the two of them spending the next
few minutes eating in silence.

“So...” Izuku starts after Kacchan has licked the container clean. “...Thanks for, uh, saving my life. When I was a kid.”

Kacchan blinks at him, and for a second Izuku thinks he isn’t going to get a response, but then the boy is grinning,
mischievous in a way that makes Izuku’s stomach stir.

“What? Not gonna thank me for the orgasms?”

Izuku’s eyes widen, and he splutters, cheeks reddening. “Oh my god.”
(Wow, this thread got a lot of attention today! Thanks so much for all the likes and RTs, I’m so glad you guys are liking this! I’m off to work but I’ll continue this later. ALSO: are you guys interested in this becoming a longer, plot driven thread, or should I wrap it up?)
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