Work Text:
Dragons were vile, violent creatures that set fire abalze to anything. His mother had warned him about them, about the dangers they pose to man-kind. How they are superior to their inferior human mortality, and Izuku listened. Soaked up every warning, every story, every tragedy that happened to those who encountered these horrifying creatures. He heeded every caution, treaded every warning on eggshells, all in order to play it safe and to never meet one in his life. Or so he hoped. But now, as a strangled moan escaped his throat, he thinks those warnings were what put him here in the first place.
"Hah..." Izuku whined as a forked tongue dragged up his throat. Despite changing into human form, Katsuki still kept many draconic features from his dragon form. And he put those features to good use, as that same forked tongue applied enough pressure on his neck to make him squirm, tilting his head further back for the dragon to get a better taste.
He was doomed to begin with, truly. The second he went into that forest, he knew there was no turning back. He didn't heed the warnings, didn't listen to his mother's words of danger. Instead, seeked out those sharp claws and jagged teeth, wanting to see this horrific creature once, just once to satisfy his curiosity. And Before he knew it, he was in far too deep to escape. For there was something more terrifying than a dragon's wrath, and that was a dragon's love.
"Kacchan!" Izuku screamed as Katsuki bit down on his collarbone, hands slowly moving down his waist and beneath the fabric of his trousers. They drag over his skin, colloused and scarred. Evident of many tireless battles and hardships, yet they felt so gentle over Izuku's skin. Izuku bucked his hips when Katsuki's palm found his cock, grasping at it and slowly dragging it up and down. It felt rough, too much on his oversensitive skin as the dragon smeared pre-cum all over his tip using his thumb. His other hand yanking Izuku's hips down when the adventurer buckled into his hold, smirking at the way Izuku withered underneath him high and needy.
"Deku." Katsuki breathed beside his ear, before kissing the area right beneath it. Izuku had wanted to run, truly this was all too much, he didn't know how to deal with what the dragon had to give. But when Katsuki captured his mouth in a kiss, fevered and teeth, he found himself signing into it and his body relax underneath Katsuki's hold. The villagers had warned Izuku of the cruelty of the dragons, but they have never told him anything about their compassion.
"K-kacchan... please..." Izuku can feel himself slowly crumble under the seams as the hand stroking his cock picks up its pace. So much so that he couldn't stop the moan escaping his throat as he willed the familiar heat in his stomach down.
"I didn't even touch you," Katsuki taunted, a wild grin on his face. It was moments like these that Izuku were reminded of how cruel dragons could truly be, and as if to further Izuku's train of thought, Katsuki stopped his movement on the adventurer's cock, taking his hand out of his trousers. Then with one swift move, flipped Izuku on his stomach and took down the remaining clothing.
"K-kacchan!" Izuku shrieked when he felt cold wind slap onto his bare skin with something wet dragging over his hole. He gripped tight onto the warm pelts below him and suppressed a whine as Katsuki licked his tongue around the rim of his ass. It felt weird, strangely satisfying yet not enough. When the tongue breached his opening, he let out a mumble of words as Katsuki started dragging the organ in and out.
He was leaking, drops of white dropping, no doubt staining the pelts below. Katsuki kneaded his thighs, both hands gently messaging the tense flesh, encouraging the adventurer to calm down and relax into his hold. Izuku complied, sighing heavily through his nose as he leaned more into Katsuki's face. Trying to stop his hips from falling down where Katsuki is holding them.
When the dragon deemed his hole wet enough, he came off with one last drag of his rim. With little time to recover from the stimulation, Izuku shrieked when a finger pressed into his ass, up until the first knuckle. He shook from the tightness of it as Katsuki leaned his body forward to plant a kiss behind his neck.
"Relax.." Katsuki coerced, gently easing his fingers further into him as he prepared kisses all over his back, trying to soothe his discomfort.
"Kacchan I-"
"Breathe, I'm here." Katsuki reassured, slowly inserting a second finger when he felt Izuku loosen up. His fingers felt tight, appendages worming their way into his inner walls as Izuku struggled to catch his breath. At this point, he could barely hold his hips up himself, and Katsuki had to support him by holding his hips for him. As a third finger joined with the others, Izuku found himself moaning when they hit a certain spot inside him. The spot had his vision white and his mind cloud with haze. The only sound he could hear was the barely concealed excitement in Katsuki's voice when he growled.
"Found it."
It was like a switch flipped on, every movement of Katsuki's fingers didn't feel so foreign anymore. Instead they felt good, pleasurable even. Izuku was nearing his limit when once again, Katsuki stopped his movements and pulled his fingers out. Izuku couldn't stop the whine of disappointment that escaped his throat.
"Patience nerd." The dragon rolled his eyes, but soon shut Izuku up when he flipped him back on his back so that he was face to face with the crimson eyes, unable to look away. There was something poking up his ass, dragging along his crack as it's aligned right where his hole was. Izuku sucked in a shaky breath when Katsuki pushed in, his cock sliding past his rim and meeting his inner walls.
"Hah..." Izuku cried, feeling his hole stretch and burn. The pleasure from before slowly fading, replaced by pain as tears caught in his eyes. Katsuki kissed them away, placing one hand lovingly on the side of his face, and the other rubbing smooth circles on his waist.
"It's okay, you're doing great."
Izuku nodded, the pain still there but not as jarring as before. Katsuki continued to kiss his neck, moving down to lick his chest and sucking on his buds. A great distraction as pleasure slowly crept back into Izuku's senses. He moaned out loud when Katsuki teased one of his nipples with his tongue, flicking the bud back and forth, then swirling it. All the while, slowly inching himself deeper and deeper into Izuku.
Izuku shuddered when Katsuki finally bottomed out, adjusting to the weight of his cock inside him. The pain of the stretch was a faraway thing now, the tip of Katsuki's cock pressed directly onto his prostate. Sending him squirming and involuntarily bucking up his hips.
"Eager aren't we?" Katsuki smirked as he started to thrust himself into the heat of Izuku's ass. Slow and torturous, grinding his hips up and down. Izuku felt himself groan when Katsuki laughed, smiling a wicked grin down at him, dragging the tip of his cock slowly across his prostate. The pressure of the grind was too much and too little at the same time. The heat slowly pooled in Izuku's stomach as he desperately tried to buck himself up and down to get Katsuki to do the same. But Katsuki just grabbed his hips and slammed them down.
"No so fast Deku," He chuckled. Kissing the adventurer as Izuku cried in frustration. "Be a little more patient-"
"Kaccha-"
"Can you do that for me nerd?"
The words die on his tongue, when those crimson eyes meet his own emerald ones. Beautiful, red, and gentle. Unlike the mean demeanor he put on just now, Katsuki was looking down at him like he was the most precious thing in the world. Out of his will, Izuku felt the answer leaving his mouth before he could think.
"Okay."
And Katsuki was grinding on him again, slow and steady. Izuku moans at the pressure, his back arching involuntarily when he is pressed against. Katsuki grabs his waist, keeping his back arched. From this angle, Izuku could feel Katsuki go deeper, grind deeper into him as he all but wails the dragon's name. The heat in his stomach builds again for the fourth time, and he clenches on Katsuki's cock hard as he is pushed further and further to his climax.
But Katsuki grabs the base of his cock, index finger and thumb holding him, squeezing lightly. The climax doesn't come, instead the heat only builds further and further and Izuku sobs. Oversensitive and denied of his climax, Izuku cries into the pelts as Katsuki intertwined his free hand with his.
"Beautiful," the dragon compliments. Grunting as he picked up his pace, thrusting faster into Izuku. The adventurer beneath his keens, head turning from left to right as he tried to fight off the onslaught of overwhelming pleasure. It's only when Katsuki feels himself getting close does he kiss Izuku again, deep and passionate. Overpowering Izuku's cries as he licked his lips and sucked on his tongue.
Izuku accepted the kiss desperately, hands tightening on Katsuki's own as Katsuki set an unrelenting pace, thrusting into him with newfound vigor and strength. The dragon let go of his cock, and Izuku feels it twitch alive as the heat comes crashing down, painting both their stomachs in streaks of white as he shouts Katsuki's name, back arched and toes curled while Katsuki helped ride him out of his orgasm.
"Fuck." The dragon cursed, as he too, felt himself getting closer. With one last thrust, he releases inside of Izuku and bites hard onto his shoulder. Hearing the adventurer yell out underneath him, from both pain and relief. Izuku shivered, the aftermath of his orgasm still granting him the high he hadn't come down from. The cloudy mind helped numbing out most of the pain as Katsuki pulled out and released his jaw. With a jumbled mind, Izuku could faintly make out the cool sensation where Katsuki had bitten him. Waves of healing magic spread over his body, lulling him to sleep as Katsuki kissed him one last time.
"Sleep nerd."