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The first time it happens is an accident, mostly.
It's really not his fault either, Ezreal has never fucked a vampire before – and certainly never dated one – he's not really sure quite how they affect each other, and Kayn had been just as clueless. It was a happy accident when they found out he's delicious and almost impossible for Kayn to drain dry.
So, obviously, it's just as much of an accident when they realize that Ezreal can, in fact, mesmerize the absolute fuck out of Kayn.
Mostly.
He wasn't even trying to do it, not really at least. He doesn't really like mesmerizing people in general, it feels icky – especially since he's adorable and everyone is perfectly happy to fuck him without it. Sometimes he uses it to get out of tickets, sure. And that one time when they said they didn't have the shoes in his size but he just knew they were in the back and maybe gave it a little juice to get them to check...
So yeah, it's not like it was on purpose.
He just really didn't want to get off the couch, but he wanted the carton of ice cream from the fridge, and Kayn was sitting one cushion closer anyway, so really it just made sense for him to ask... and to give extra sad puppy eyes when Kayn scoffed... really extra sad puppy eyes.
It's not like he knew that Kayn would go under like a rock in a pond, getting to his feet almost mechanically and coming back ten seconds later with the ice cream and a glazed look on his face.
Needless to say, they'd had a whole boring discussion about boundaries after that, which is rich considering that Ezreal wakes up at least three nights awake with Kayn snoring away, buried in his neck like he's the world's juiciest teething ring.
(Though, to be fair, Kayn often wakes up with a cock in him, so maybe they're even.)
But that's neither here nor there.
Here and now is a lot more delicate, maybe, because Kayn came home with murder in his eyes and his shoulders to his ears – clearly not a great day at work. Lately he's been dealing with this literal troll at work who keeps doing a whole bunch of stuff that Ezreal half listened to but agreed at appropriate times and he's sure it's horrible judging by Kayn's face.
His very pretty face. The one that's scowling right now when it should be smiling and happy to see Ezreal, because he's pretty and makes everyone's day better.
“Dealing with what's-his-face again?” Ezreal asks, shifting to sprawl on the couch in a way that leaves room for Kayn to crawl between his thighs if he wants.
“I'm gonna drain him dry,” Kayn grunts as he heads straight for the fridge to snag the bottle of extra-red wine. “Except that he'd probably taste like the fuckin' swamp he crawled out of.”
Ezreal is pretty sure that's the kind of talk that would get Kayn sent to HR... again.
“Mmmm, sounds like you've had a rough day,” Ezreal coos, splaying his knees a little wider and letting his head tip back against the arm of the couch to expose his throat. “Maybe I can help with that?”
Finally the man picks up a hint and looks up from where he's got a long fang sunk into the cork of the bottle – because he's a heathen who never bothers to use a damn wine cork.
“Oh yeah?” He wiggles his fang free of the cork and sets the bottle back on the counter, rounding the edge to pad across the living room. “You're gonna let me take out my frustrations on you, huh?”
“Not quite,” Ezreal laughs, reaching up to snag Kayn's hand once he's close enough, pulling him in until he's forced to settle a knee between Ezreal's thighs with one hand braced on the arm of the couch. “But I think I can help you forget all about it for a while...”
He tests the waters with a little flick of his will as he holds Kayn's eyes – not enough to snare him, more like a gentle knock on the door of his mind.
Kayn tenses for a moment, his mind recoiling before he softens all at once, swaying forward with a nod. “Yeah... all your problems now.”
Ezreal grins at him as Kayn's body goes lax, pulling him down to settle fully between his thighs.
He's wrong, they're not Ezreal's problems now – they just cease to exist, like everything in the world except Ezreal himself. There's not a thought in those eyes as they stare down at him in utterly thoughtless bliss – usually glittering red, now glazed and shifting toward the same shade of blue that Ezreal knows his own must be glowing. He's pretty like this, a big bad scary creature of the night as docile as a puppy between Ezreal's legs.
“Are you hungry?” he asks, reaching up to push a finger into Kayn's mouth, tracing the edge of a sharp fang. Kayn nods his head, and Ezreal smiles at him. “No you're not.”
“M'not.” Kayn mumbles around his finger, nodding again as his eyes slip to half mast.
“You wanna be good for me though, right?”
Another nod, and Ezreal feels his grin growing until his own sharp canines are exposed.
“Yeah, I knew you were a good boy deep down.” He pushes his fingers further into Kayn's mouth, shivering at the way his throat stays relaxed, then pulls them out to smear spit across his cheek. “You don't wanna fight, huh?”
Kayn blinks at him, slow and sleepy, pressing into the slick hand that pets him. He's so sweet like this, in a way that he never would let himself be otherwise. The rush of power it gives Ezreal is intoxicating despite the fact that he hasn't even started to feed yet.
“You wanna suck my cock?” he purrs, dragging a finger across Kayn's bottom lip. “I'll let you.”
Normally that would earn him a scoff or a sneer – but now Kayn only whimpers, nodding as he crawls down Ezreal's body to nuzzle the front of his shorts.
“Go on,” Ezreal coos as he pets at Kayn's hair. “Be a good hole for me.”
Kayn hooks his fingers into the waistband and pulls them down, not wasting a second before he's taking Ezreal down to the root and settling in there with a happy little hum. It's such a surreal clash with their usual frenzied fucking that Ezreal can't help but laugh at his happy crescent eyes.
“Look at you, you love this don't you?” He pushes Kayn's bangs out of his face, stroking a thumb across his lips where they're full and pretty. “You're gonna be so annoyed when you come up, huh?”
Kayn hums again, settling deeper into it with a half-choked sigh.
“You want me to fuck the bad day right out of your throat?” Ezreal asks, hitching his hips up to earn himself a pretty little gurgle, “I bet you do.”
Kayn nods around him again, so sweet and suggestible... so Ezreal decides he'll do him a favor. He weaves his fingers through Kayn's bangs, palms the back of his head, and fucks up into his throat with a cheerful command, “Don't gag.”
Kayn doesn't gag. But he does drool and drool , all wet and messy and cute as Ezreal fucks right into that blissfully empty head of his. He would like to think that Kayn's throat is going to be all bruised and his voice nice and raspy later – but he's not sure if his cock is actually hitting the back of Kayn's throat or not, it's hard to tell when the whole wet heat of him feels so good in general. Still, he doesn't need to have a massive cock like some of the incubi rely on (it'd be all unwieldy and make his pants fit funny anyway), he just needs to know how to work with what he's got.
And what he's got is a vampire utterly at his mercy, and enough magic to impregnate half the city.
“Come for me,” he demands, just to feel the way Kayn's whole body tightens as he ruins his pants on command.
Maybe a little too tight. Now there's a fang in his dick.
“Don't bite me!” Ezreal squawks, jamming fingers in his mouth to hinge open Kayn's jaw as he shudders through his orgasm. “Kayn!”
Kayn blinks at him, blank and glossy, and opens his mouth. There's blood on his tongue – blood from Ezreal's cock, again – and a wet spot on his pants... but he can't say it's not an enticing picture.
“Okay, fine,” Ezreal sighs, because his life is difficult, and starts stroking his cock as he shuffles them around to hover over Kayn. “Just because you're asking so nicely.”
He paints Kayn up like a modern art masterpiece, dripping across his face and into his mouth (and eyes, yikes, that's gonna sting), then sits back with a gusty sigh to admire his work.
One debauched vampire, dazed and dripping and smiling serenely through it all. Two orgasms between them... a bit low if he does say so himself, and he does, because he's the local orgasm expert. He's still a bit peckish, and Kayn is probably still in need of some of Ezreal's patented stress relief.
Not to mention he's looking a little hungry too...
“Do you want dinner?” Ezreal asks him as he taps against the artery on the inside of his own thigh. Kayn nods, beginning to salivate like a dog – which on the one hand is kinda hilarious, but Ezreal is starting to miss his... Kayn-ness. “You may suck.”
Kayn dives for him teeth-first without even a single snarky remark, fangs sinking in and blooming exquisite pleasure up Ezreal's spine. This is his favorite part – Kayn feeding on him always feels like getting fucked from the inside out on some weird cellular level, like all his guts are being pulled out of him in a neverending slide, then replaced with the softer backwash of venom that sends sparkling crawlies through his whole body.
Except Kayn is being all clean and polite about it, which is weird. And his eyes are all glowing blue where they're locked onto Ezreal's, which is even weirder. Ugh.
He heaves a sigh and drops his control over Kayn, fixing a smirk on his face as he watches the glow recede and awareness spark back into Kayn's eyes.
Dark brows furrow for a moment as Kayn squints and winces and muffles a question into Ezreal's thigh – then he seems to come into awareness of his position and slides his fangs out with a schlick.
“What the fuck?” he sputters, wiping at his face and eyes – oopsie. “In my eyes, Ez? Really?”
“You didn't close them!” Ezreal defends himself, not bothering to close his legs where he's still hard and slimy and bloody. “How was I supposed to know you have zero self preservation instincts?”
“Gee, I dunno,” Kayn grunts, smearing and blinking through the watering. “Maybe because you're a predator whose fun party trick is to remove them?”
Okay, fair, but! …Hmph.
“But did you have a good time?” Ezreal asks, reaching to cup the sticky mess of Kayn's pants. “Cause it looks like you did... and I even got you dinner!”
“You tried to fuck my throat and then demanded I cum without even touching my cock,” Kayn scoffs, like that's not a pretty good gift – ungrateful. “Don't tell me you're already done for the night-”
“First of all, 'tried'?” Ezreal huffs-
“You're not choking me on that-”
“Don't talk about my dick like that, you never complain when it's in you-”
“You're an incubus , Ez-” Kayn laughs as he gestures at his dick (double rude). “-you could make me cum with a toothpick-”
“Okay but-”
“And you didn't even fuck me-” Kayn continues – and now maybe Ezreal is beginning to regret dropping control of him so soon. “-I thought you were gonna make me forget all about my day, not give me a tickle in my throat and three sips of a snack.”
It's so obviously bait. Kayn's got his stupidest awfulest most obnoxious smirk on. And his stupid eyebrows are arched in a challenge and he's just the worst. Ugh.
Ezreal lunges at him anyway, knocking him from the couch to the floor in a snarling heap, tearing at his stupid cum-splattered pants as they go down.
“I'll show you -” he snarls, sinking claws and teeth into Kayn as he tries to wrestle him onto his back, one hand slicking with cum and pushing in.
Kayn has the audacity to laugh, high and stuttering as Ezreal pushes fingers inside him, but laugh all the same – so, naturally, Ezreal has to end him.
He's not going to mesmerize him again, but that's not the only trick he's got up his sleeve – and not even the most fun. Instead he finds that thread of arousal in Kayn, a steady flickering fire, and gleefully pours every bit of magic he can spare into it.
“ HNNGG- ”
Which might have been... just a tad much.
“ Ez- ” Kayn wheezes out, arching like a live wire as he clamps down hard on Ezreal fingers and immediately splatters his own stomach again. “What the fuck-”
He's sweating and cursing, writhing under Ezreal frantically, rolling his hips and whining when the fingers inside him pull out – much more fun than when he's all docile.
“Don't worry, Kayn,” Ezreal chirps at him as he lines himself up, “I've got a toothpick that'll fix you.”
He thinks Kayn laughs at that – or maybe it's some sort of sobbed wheeze, it's kinda hard to tell when he's pushing his cock in and setting a frantic pace to rearrange Kayn's guts. Or rearrange his psyche at least, because if you can only choose between reliably scrambling the prostate or the brain chemicals... pick the brain chemicals.
Kayn seems to agree, judging by the way his eyes roll back in his head and his cock leaks steadily onto his own stomach. It’s less like when he’s just horny-oozing and more like a constant orgasm, which Ezreal didn’t even know he could make someone do… neat!
“You're so pretty like this,” Ezreal coos at him, “Much better than when you're a doll.”
“ Ffff- ” Kayn mouths uselessly into the air, probably trying to scowl. Cute.
He deserves a reward.
“Oh, you wanted more than a tiny snack too, right?” Ezreal purrs at him before sinking his fangs into his own tongue. “Don't worry sweetheart, I've got you.”
Kayn moans like a whore as the blood and spit hits his mouth, making even more of a mess of himself up his chest and clamping like a vice.
“Oh you like that, huh?” Ez snickers through his own stuttering thrusts and trembling muscles. He's starting to wobble, but it's fine. He doesn't even need to be inside Kayn to get his way... but this fucking business is hard work, he doesn't know how people without sex magic do it. He tugs harder on the hold he's got on Kayn's current of arousal. “Ask me for more.”
“Fuck off - ” Kayn gasps through grit teeth, shivering and glaring, eyes burning like hellfire.
“Aww, that's not nice.” Ezreal tsks and leans lower, sinking his teeth deeper into his own tongue until it drips steadily between them into Kayn's open mouth. “And I'm being so nice to you.”
Kayn laps like a dog at each splash, panting and whining at the tiny amount of blood – until he gets a feral sort of gleam in his eyes.
And then the world goes topsy-turvy and Ezreal finds himself on the floor with a tongue in his mouth, licking blood out of every crevice.
Somehow, his cock is still inside Kayn, who seems to have forgotten that fact in his chase for more blood. Which is fine, because honestly Ezreal was getting kinda tired, and it's hard to get off when he's burning all his own magic driving Kayn dick-crazy. If a half-feral vampire wants to ride his cock, who is Ezreal to stop him?
So he slumps onto his back and sticks out his tongue, letting Kayn gnaw on him like a chew toy. It's fine. It lets him focus on his own pleasure now – which is his favorite thing to do – and it's not long before Kayn's writhing chase for blood has Ezreal spilling inside him with a whimper and starfishing flat on the floor with a wheeze.
Kayn pauses his dog-like efforts to discover blood in Ezreal's tonsils long enough to blink at him in disbelief. “You're done already?”
“Wha- you- ” Ezreal huffs, swatting weakly at the bastard straddling his hips. “I gave you like a billion! I used up all my juice making you spill your juice all over!”
“Gross.” Kayn cringes – which, rude, after Ezreal gave up all his magic guts to make that mess.
“You suck-”
“Literally,” Kayn interjects, because he's the worst.
“And I'm tired,” Ezreal continues, because it's Kayn's turn to take care of him now. “Cum on me and rub it in.”
Kayn has the audacity to roll his eyes, like it's a hardship and not something that Ezreal is absolutely certain gets him going.
Like it doesn't take less than a minute for him to jerk off onto Ezreal's chest, clenching around where Ezreal is still buried in him.
“Gross,” he mutters again as he rubs the mess up onto Ezreal's throat, but he's got that crooked fangy smile on his face. “Your dinner is worse than mine.”
“Is not,” Ezreal scoffs, already feeling invigorated with each smear into his skin. “At least mine dries clear.”
Kayn raises a skeptical eyebrow at the milky-crusty-slimy smear between the two of them – half of it tinged pink. “Uh-huh.”
“Shut up and thank me for making your day better.”
A huff of laughter against his cheek, then cold sticky lips.
“Thanks for getting my mind off work, Ez.”
“You're welcome.” He turns to steal a kiss, sanguine and unhurried. “Next time I'm gonna mind control you into rubbing my feet all night though.”
Kayn nips at him in retaliation, eyeing the wreck of his sweatpants and mess on his stomach.
“Next time I'm hitting the bottle of extra-red and keeping my sunglasses on.”