Archive of Our Own ^beta

Like any proper dragon of his calibre, Katsuki knew how to cultivate a hoard.

As a young wyrm, he had excelled in his education. He knew that a dragon’s hoard-sense manifested as a tingle along the spine that intensified the longer their treasure remained uncollected, causing extreme agitation, possessive outbursts and itchy scales. He knew that a dragon whose hoard was threatened would react with a snarl and spout flame as a warning, and they would escalate to ultraviolence should the threat remain or—Ancalagon forbid—their treasure be stolen.

He knew that hoards appeared in all shapes and sizes and that they differed from dragon to dragon. Some dragons hoarded classic treasures like gold or jewels; others hoarded more mundane objects like toadstools or ballet slippers. Sometimes mated pairs developed joint hoards if their treasures happened to coincide. Katsuki’s sire and dam, for example, hoarded stitchery and clothing respectively.

Even metaphysical concepts like freedom and strength could be hoarded. Katsuki had heard the legends of the Wandering Drake and the Warrior Drakon all his life, and had long admired their tenacity in the pursuit of their respective treasures.

Other dragons still had stranger hoards. One of Katsuki’s mentors hoarded cats and everything related to them—cat statues, cat toys, actual living, breathing cats—you name it, the bastard probably had it. Another mentor of Katsuki’s hoarded sex toys in every shade of purple, for fuck’s sake, which just served to demonstrate the endless possibilities of treasures amongst dragonkind.

Yes, Katsuki knew everything there was to know about hoards theoretically, but he’d never felt the pull to create one himself.

Until now.

There’s something glimmering at the entrance to Katsuki’s cave.

Reptilian eyes narrow in predatory curiosity as a tiny green something flits its way into the mouth of the cave, gamely examining everything from the detailed stone carvings to the faceted gemstones studding the walls, enchanted to illuminate the space with a gentle glow.

Katsuki may not have a hoard yet, but any dragon worth their salt likes a bit of glitter in their dwelling. Besides being beautiful, there’s something extremely soothing about shiny things. After a millennia of hoarding, the lust for gold and gems has probably been encoded into the dragon genome.

The little thing flutters infinitesimally closer, and Katsuki can finally see that it’s a fairy. A male, he thinks. The fairy’s delicate gossamer wings shimmer green and gold under the enchanted lamplight, and Katsuki suddenly—finally—feels a tingle crawling down his spine. Greed burns low in the dragon’s belly as the gorgeous creature runs his tiny fingers over an intricate tapestry, clearly fascinated. Katsuki blinks and his world realigns.

This? This little fairy is to be Katsuki’s treasure? He’s…

…perfect.

If there is one thing that the Fair Folk are known for, it is their propensity for mischief. Izuku, however, finds his curiosity to be a far more dangerous beast.

It always seems to lead him into trouble.

Izuku peers into the darkened cave, his moss green eyes alight with wonder. “It certainly smells like magic…but there is something strange about it,” he murmurs to himself. He inhales again, catching the familiar taste of ozone on his tongue. And is that… “Caramel?” Izuku brightens. Well then, that decides it. He certainly can’t ignore something sweet; he has to explore this cave!

When he flies past the entrance, his eyes widen in sheer delight. How lovely! The cave is far more spacious than it had appeared from the outside and is softly lit by large, glowing gems. Izuku zooms to the nearest one to examine it. “Oh, what a well-executed enchantment!” he exclaims. “A perpetual loop that feeds off ambient magic…does it—yes, there, brightens and dims with a trigger, clever.”

Usually, Izuku would pick apart an interesting piece of magic until he understood every component, but this time, he abandons the gem in favor of exploring the rest of the cave. The base magic structure of the enchantment doesn’t taste of caramel; clearly, it was performed by someone other than the inhabitant.

He darts over to the bas-relief carvings of various magical beings on the other side of the narrow cave entrance, iridescent wings fluttering gleefully as he takes in every minute detail. Beneath his skin, his magic writhes, wanting nothing more than to burst forth and follow the golden spiderweb that is the traces of magic left on the stone surface. It’s pretty, and it smells so good.

Shaking with excitement, Izuku spins away from the stone carvings to continue exploring and immediately catches sight of a large tapestry of a forest scene deep inside the cave, exquisite in both detail and beauty. With an awestruck gasp, he flies over to the tapestry so fast, he practically teleports. “Amazing,” he breathes, “it looks so real!” The glimmer of magic threaded through the woven fibers shimmers brighter than spun gold, and is a million times more entrancing. Izuku cannot resist the impulse to touch it.

From the darkness comes a sudden hiss. “The fuck are you doing here, huh?” Before Izuku can even think to scream, a great big paw reaches out of the shadows and snatches up the tiny fairy.

“Tiny li’l things like you should know better than to creep into a dragon’s nest. Some might think you’re after their damn hoard.” The dragon’s forked tongue flickers in and out, tasting the air. Izuku is frozen in petrified silence under that cool, reptilian gaze. “You’re hardly a mouthful, but I think I shall keep you, little fairy.”

That proclamation makes Izuku unfreeze. “Keep me? I categorically refuse to be kept by an overgrown lizard.” He cringes when the dragon’s nostrils flare angrily, releasing a plume of smoke. Stupid, stupid, stupid. How could Izuku be so stupid? Back-talking to a dragon is a death sentence!

“Snarky little bastard, arentcha?” the dragon hisses. It sends a shudder of pure fear down Izuku’s spine to see those crimson eyes darken with ravenous hunger. He struggles against the dragon’s solid grip, but, like fighting against cold iron, it is utterly futile. Ugh. Magic it is… even though Izuku isn’t so certain that Blackwhip will be an effective weapon against magic-resistant scales.

The scarlet dragon watches him gasp for breath, amused. He says in a low rumble, “I understand now. Such a precious, feisty little thing you are—you’ll be worth every last bite.”

Oh no. “Are you going to eat me?” Izuku squeaks, holding his magic at the ready.

The dragon bares his fangs in a wide and predatory grin. “Oh, definitely. I’m gonna eat. You. Up.” With a flick of a razor-sharp claw, Izuku’s spider silk gown is torn to pieces. The tiny fairy shrieks in terror, beating his wings uselessly as the dragon lifts him towards that gaping, toothy maw. This cannot be the end! He simply refuses to lie down and die!

Izuku squeezes his eyes shut and gathers his magic thickly under his skin, preparing for the most opportune moment to wrench the dragon’s jaw open and make his escape. The dragon’s breath washes hotly over his nude body, engulfing him in falsely comforting warmth. Izuku braces himself, holding his breath for those dagger-like fangs to near so he can use them as anchor points for Blackwhip.

All of Izuku’s expectations shatter when instead of being torn to pieces by serrated teeth, a large, forked tongue slithers over him, coating his entire body with gooey dragon spit. “Oh!” Izuku cries out. His lashes flutter against the unexpected pleasure of that slick, strong muscle winding around him and lapping at his balls.

“You taste good, little fairy,” the dragon hisses, pleased. He gives Izuku’s nude form another considering lick, paying special attention to his stirring cock. Izuku moans, holding onto the talon barred across his chest for dear life, and parts his thighs just enough for that prehensile tongue to slip through. The dragon takes advantage of the opportunity with an eager growl that vibrates through Izuku’s entire body, bringing his erection to full strength. His eyes roll back in his skull with pleasure when that forked tongue undulates against his groin as it slides up the cleft of his ass.

When Izuku has gone nearly dizzy from sensation, the dragon finally pulls away, swiping that absolutely indecent tongue against his sharp white fangs in satisfaction. “Mm, yeah, fuckin’ incredible. But you’ll taste even better covered in my scent, precious. I’m gonna make you mine.”

“‘M not your precious, I’m Izuku,” gasps the dazed fairy.

The dragon’s predatory grin gleams in the enchanted lamplight as he carries the tiny being to his nest at the back of the cave and lays him down in the center of the soft, plush fabrics. “Precious, Izuku, same difference. All that should matter to you now is that you’re my fuckin’ treasure. I’m gonna write ‘Property of Katsuki’ all over your ass.”

What, literally? wonders Izuku. He tries to ignore the twitch his cock gives at the thought and pries open his eyes to look up at the dragon—Katsuki, apparently. His jaw drops when he sees the dragon’s scales part beneath his belly and out slips a ginormous, bulging cock from his slit, already dark red and glistening with arousal. “Oh my—oh, yes,” Izuku breathes.

The dragon shuffles forward and lowers himself over Izuku, bringing the leaking, tapered head of his cock closer to the tiny fairy. Heat coils in Izuku’s stomach as he follows a dribble of precum down the ridged underside of the dragon’s shaft, utterly transfixed. The cock is large enough that he’s certain his fingers won’t touch if he wraps himself around it.

“Good, Izuku,” Katsuki purrs, giving a little thrust so that his dick sways even closer. “Stay right where you are, precious, an’ lemme—” His voice breaks on a raspy groan when his cockhead finally makes contact with the fairy, daubing him liberally with hot precum. Izuku moans sweetly as it draws a slick line from his belly to his throat, utterly intoxicated by the heady scent of musk and pulsing heat. He hurriedly splays himself across the blankets, ignoring the mild discomfort of his pinned wings in favor of inviting the dragon closer. “Again!” he cries.

“Don’t gotta tell me twice, precious,” Katsuki growls. Eagerly, he slides the entirety of his huge, swollen shaft across the fairy’s tiny body. Izuku groans as the ribbed underside bumps back and forth against him, stimulating his own smaller cock with every stroke and making him feel like he’ll suffocate from its incredible weight. Pleasure curls through his veins, sending his limbs aquiver around that slick, solid length and oh, Izuku could die happy from being rubbed raw to the point of oversensitivity all over. It is a sensation unlike anything he has ever felt before; already, he cannot see himself living without it.

A glob of precum splashes on Izuku’s face and spills straight to the back of his throat, making him choke as the dragon continues humping him from head to toe. Coughing repeatedly, Izuku fastidiously wipes away the precum from his features and glares at the giant dick while he licks his hands clean. His skin is buzzing with delightful rawness and the delicious taste of musk, salt, and caramel-tinged magic tingles pleasantly on his tongue, but the fairy decides that enough is enough. It’s time for a little payback.

When Katsuki draws back with a rumbling groan, Izuku seizes his chance to strike. In the blink of an eye, black tendrils lash themselves around the dragon’s cock, twining around each other to form a series of neat loops that accentuate the shaft’s grooves and ridges. “Hah?” Katsuki snaps in surprise as Izuku hauls himself out from under him and launches himself into the air.

“You almost drowned me!” Izuku scolds as he lands on Katsuki’s tip and promptly slips on the slick surface. The dragon makes as if to catch him, but Izuku hisses at him and regains his balance with a single flap of his wings. The jerky motion pulls on the tendrils roped around Katsuki’s dick and scatters sparks across the deep red, swollen flesh. “Fuuuuuuck! What is that shit?” Katsuki hisses as he humps into the air, closing his eyes and mindlessly scoring his claws against the stone floor in pleasure.

This time, Izuku is ready for the motion. He smiles smugly and tugs on his magic again. “I call it Blackwhip.”

“Whatever it is, do it again.” The pure lust in the dragon’s rough voice makes Izuku shiver with need. Still, he’s not about to let Katsuki take charge again! He lets himself slide down the front of the massive cock, releasing Blackwhip at the last second to grab the raised edge of the glans. The dragon spits out a curse when Izuku notches his knees firmly around the slippery head and squeezes, then lets out a raspy chuckle. “Heh, I see where this is going. Gonna punish me for making you breathless? Use my fat fuckin’ cock as a sleeve for that tiny fairy dick?”

“No, what gave you that idea?” Izuku’s sarcastic response makes Katsuki snicker, but the fairy is no longer paying attention to their conversation. He licks his lips hungrily and grinds his much smaller length against the soft skin of Katsuki’s crown, smearing it in the clear fluid leaking from the slit until his entire groin is coated in slippery, unnatural warmth. By the gods, he’s about to fuck a dragon!

A knot of arousal tightens in Izuku’s belly as he humps across the divot of the dragon’s flared slit until he’s breathless and on the verge of losing his mind. Unable to tease himself any longer, he rocks back and plunges his cock straight into Katsuki’s urethra in one swift motion. The hot, wet channel twitches sweetly around him in welcome and it feels indescribably good. He hunches over the cockhead with a lusty groan, fluttering his wings weakly.

“Having fun, precious?” Katsuki’s rumbling croon penetrates the hazy pleasure clouding Izuku’s mind. “Uh-huh,” he pants, pressing an open-mouthed kiss to Katsuki’s throbbing shaft that quickly turns into laving at his skin for more of that musky, salty taste. The dragon gently scrapes a claw down Izuku’s spine, careful not to snag his gossamer wings, before tapping the fairy’s ass with that padded finger. “Gonna be hard to punish me with that pinprick dick of yours. But I want to see you try, so hurry up already.”

Izuku’s eyes drop to where he’s penetrating the dragon’s urethra. Izuku has a stockier build than most fae—and magic—due to his mother’s imp heritage, and it is certainly evident in the stoutness of his cock. Even so, his girth barely fills the dragon’s slit. Katsuki looks down at him clinging to his glans, amused, and nonchalantly sits back on his haunches. “Go on,” he chuffs indulgently. “Fuck me like you mean it, Izuku.”

And ooh, that riles Izuku up something good. He narrows his eyes at the dragon, wanting nothing more than to wipe that reptilian smirk from his face. His magic responds to his annoyance and writhes under his skin.

Oh.

Now there’s an idea.

Izuku eyes the dragon’s slit speculatively, dipping his tiny fingers past its flared rim. No, he decides, even if he were to shove his entire arm inside, Katsuki would still likely not feel much. Oh, shit. Lust punches Izuku in the gut, leaving him breathless as the sheer magnitude of their size difference truly dawns on him. The sharp inhale he hears from Katsuki plus the hot precum that wells up around Izuku’s dick and drips down his balls proves that the dragon noticed it too.

Already, the silken heat of Katsuki’s urethra is nearly overwhelming, but Izuku is stubbornly determined that he won’t be the only one receiving pleasure from this encounter. He grips the ridge behind Katsuki’s glans and flutters his wings experimentally; to his delight, he finds he has enough leverage to make a proper thrust. He flashes the dragon a mischievous grin. “Ready?”

Katsuki snorts, releasing a puff of smoke. “Finally figured out how to use your dick, huh? ‘Bout time.”

“Oh, I know how to fuck,” Izuku chirps. “I just had to figure out how to fuck you.”

The dragon’s deep, throaty chuckle resonates in Izuku’s bones. “By all means,” he smirks, “show me what that tiny dick of yours can do.”

Izuku draws his magic to the surface with a flex of his fingers, and more tendrils of Blackwhip appear in a shower of sparks. Katsuki hisses as it sparks across his sensitive flesh. “Oi, watch what you’re doing with that, little fairy,” he scolds, but Izuku can see the lust burning in his crimson eyes. He grins impishly, feeling that giant cock twitch around his own. “I’m not tiny, Katsuki, you’re just freakishly large.”

“Tiny as fuck,” the dragon reiterates.

“Are you sure about that?” Izuku teases back. He doesn’t give Katsuki an opportunity to respond before he carefully threads a strand of Blackwhip into the dragon’s massive cock. When this results in a thick spurt of precum and an earthshaking groan, Izuku eagerly feeds a few more thin tendrils past his own dick into the gape of the dragon’s urethra.

The foreign feeling of something pressing him open and sliding down his dick makes Katsuki’s pupils narrow in reptilian hunger. None of his former lovers had ever tried something so daring, but the dragon finds the sensation incredibly erotic. Part of Katsuki wants to be furious that he’d never discovered this unreal pleasure on his own, but another part of him roars with pride that it’s his precious treasure who has introduced it to him. Lovely, wonderful, precious Izuku—how perfect he is! No gold nor jewel nor robe of silk could compare to the pleasure of Izuku breathing on Katsuki’s glans as he splits his cock slit wide.

Tendrils of Blackwhip tease the sensitive walls of Katsuki’s urethra as they sink deep inside. The dragon roars with pleasure when Izuku makes the bands around the outside of his shaft pulse and tighten while the strands inside his cock writhe and spark as they meld into a single, thick tendril. It’s too much. “Fuck me,” Katsuki hisses, falling forward onto his shaking forelimbs.

“W-with pleasure,” Izuku stutters before fluttering his wings purposefully. When his cock slides out from Katsuki’s slit, Blackwhip follows; when he sinks back inside, so too does Blackwhip. The easy back-and-forth motion gains speed the more Izuku grows accustomed to fucking his dragon’s cock.

With every stroke into that blissfully warm, wet hole, Izuku’s pleasure rises and his grip on his magic loosens. Blackwhip seems to take on a mind of its own. A tiny black strand pins Izuku’s shaft against the smooth wall of Katsuki’s urethra, making his thighs tremble and his vision blur from the sweet pressure. The fairy quickens his pace with an eager grunt.

Meanwhile, the rest of the thick tendril curls and coils as it wriggles its way deeper into the dragon’s large cock, expanding to fill the gaping emptiness until Katsuki bucks into its mad thrusts with a grateful hiss. The violent motion almost sends Izuku flying. Quickly, he tugs on his magic and secures his hips flush to the dragon’s flared, reddened slit, simultaneously tightening the bands wrapped around the giant cock and making them spark in reprimand.

Overwhelmed with pleasure, Katsuki lets out a weak roar and thrashes his tail across the ground. He barely has enough presence of mind to hold back a tongue of flame when the little fairy squeezes his glans harshly between his thighs and rubs his tiny dick around the oversensitive edges of Katsuki’s fucked-open slit in between thrusts. Embers fall from the dragon’s nostrils into the nest where they are quickly smothered by the fireproof runes embroidered on the fabric.

A gush of abnormally hot precum leaks out around Izuku’s tiny cock despite the thick tendril coring out Katsuki’s shaft. He smothers a gasp against the dragon’s flushed skin and desperately rocks into the large, twitching hole, wanting nothing more than to be drenched in Katsuki’s cum. He’s intoxicated by the pure, musky scent and slick heat of his dragon’s pleasure, and he can only imagine how much more incredible it will be once he brings him to orgasm.

With a high-pitched whine, Katsuki mindlessly scrabbles his claws against the ground and bucks into the punishing squeeze of his Blackwhip binds. Izuku’s frenzied thrusts are mirrored by his magic; each stroke that fully buries the fairy’s tiny dick inside Katsuki’s cockhead also plunges that thick, pulsating tendril deep into the dragon’s swollen cock, stuffing him full all the way to his base. His urethra feels raw, fucked out, and blissfully oversensitive in a way he has never felt before. Every jolt and spark of his fairy’s magic inside and out brings him closer to the brink.

Despite the overwhelming pleasure he’s in, Katsuki willfully resists the urge to blink. He has no desire to take his eyes off of that tiny, freckled face, all flushed and twisted in desire, clinging to his dick and mouthing desperately at his sensitive flesh. Suddenly, Izuku shudders and lets out a guttural cry, and there’s a spurt of tingling warmth dripping into his urethra. The sparking, pulsing tendrils of Blackwhip disappear entirely, leaving the dragon empty and buzzing with oversensitivity. White hot arousal crashes over Katsuki like a riptide and drags him to the floor. His precious treasure came inside his cock.

Electricity buzzes down Katsuki’s spine, narrowing his world to shades of lust, greed, and greengreengreen.

my treasure my hoard my precious little Izuku, you’re minemineMINE

The dragon’s roar splits the air as his forelimbs buckle in pleasure, forcing him to fall snout-first into the rumpled nest. With one shaking paw, he cradles his precious treasure to his cockhead while the muscles in his groin contract powerfully in a long, satisfying orgasm. Hot cum rushes up and out of his raw, oversensitive slit, completely covering Izuku in his seed and scent and finally, finally marking the tiny fairy as his.

It takes a few long moments for Katsuki to come down from his high and regain his breath. Then, he carefully peels an exhausted Izuku off his softening dick to let it retract and raises him to his snout. This time, the tiny fairy immediately melts into the gentle rasp of the dragon’s tongue, grinning tiredly and luxuriating in the sensation of being licked clean all over.

Once he’s finished, Katsuki gently noses at Izuku’s bare, chafed pink skin. His nostrils flare in satisfaction at their combined scents. “You’re mine now, precious. My Izuku.” Blinking slowly, the little fairy hums in agreement and curls up in the center of Katsuki’s paw, tucking his hands beneath his head as a pillow. As if the sweet sight was not enough to tug on the dragon’s heartstrings, Izuku mumbles sleepily, “You’re mine too… Katsuki.” His gorgeous emerald eyes finally close as he drifts off to sleep.

Katsuki grins. The instant the fairy snarked back at him, the dragon knew his instincts hadn’t steered him wrong. Izuku is the best damn treasure he could have ever asked for, and was well worth the wait. Katsuki is going to treasure his precious hoard for the rest of their lives.