#kaeya reader insert

Sometimes, you’ve gotta do what you’ve gotta do; for yourself, and at some points, for others. A period of financial hardship recently fell upon your family, and though it’s mostly been resolved by now, the lingering fear that it could happen again has surmounted in you taking a rather. . . Foolish deal. Like most citizens of Mondstadt, you’ve been wary of the Fatui’s presence in the nation. They seem to be up to nefarious things that people like you aren’t privy to, and the prying eyes that sit deep behind their masks always unnerve you as you pass them by. Today, however, you were actually approached by one of them, —one who promised you a small fortune for a devious act.

Initially, you were quick to turn her away. Mora wasn’t worth working with the likes of the Fatui, you thought. . . But sometimes, moral sacrifices have to be made. You thought back to your scrambling family, uncertain of where their next meal would be coming from, thought back to the sleepless nights you spent doing odd jobs around the city that nobody else would touch just to be able to afford a few basic necessities. And then, against your better judgment, you accepted her conditions as long as she promised to keep you anonymous from her allies and request nothing of you ever again going forward.

A part of you wonders, even now that you’re trapped in the thick of it, if she’ll truly hold up her end of the bargain. You can only hope she’ll have enough decency to be true to her word.

With uncertain hands, you rummage about Kaeya’s personal office. All it took was a few minutes of begging and a few mustered up tears for you to be let in, —told that Kaeya was currently returning from a mission and would be back soon enough. You kept up the act; played the guards like a fiddle, and had to admit that there was a certain thrill in doing so that you hadn’t expected to enjoy so much. Sniffling, you thanked them profusely for their kindness, (for their stupidity,) and sat alone in the room until you were sure they’d gone on their ways.

That’s when the search began. Maybe there’s a method to Kaeya’s madness, but you certainly don’t get it. Then again, you’re not exactly sure what you’re supposed to be looking for either. It’s possible that the woman had simply approached you to test your limits, see if you’d be willing to commit an act of betrayal against your nation. . . When you think about it like that, it makes you want to run away from it all, offer apologies in advance for something you haven't even officially done yet.

But it’s too late to turn back now, and if the worst comes to pass again, you’ll need the Mora you’ve been promised. At the end of the day, your obligations are first to your family; not to Mondstadt as a whole. So, you continue forth with your rummaging, flicking through useless papers that would likely be of no interest to your commissioner. There were no specific instructions, but the last thing you’d want is to go through all this trouble only to be told that your efforts were in vain. As such, you’re left rifling through documents and letters, stationary items, and other miscellaneous things. Nothing that you would personally consider to be of note, —but maybe the Fatui will have some use for one of Kaeya’s personal letters to someone unnamed about the sweet taste of wine in the fall.

Frustration takes hold, your heart hammering like a drum in your chest as you try to listen for footsteps in the hall. The last thing you need from this is to be caught snooping around in the Cavalry Captain’s office.

With that in mind, —it seems you've jinxed yourself. In your attempt to be swift, you open a drawer much too quickly, and its contents spill out onto the floor. A glass bottle shatters, and with it, your nerves fry themselves into a dish unsuitable for even the wild animals of the forests. The distinct, metallic scent of blood fills your nose, and you reach up, thinking that the fear has left you with a nosebleed. However, you quickly realize. . . That’s not the case.

Rather, the pool of red liquid at your feet emanates the strong odor. You’re no wine connoisseur by any means, —but you’ve never smelled one that reeks of blood. That can’t possibly be normal. . . Right?

You bend down, dabbing the tips of your middle and index fingers into the substance. It clings much too well, feels thinly viscous when you rub it against your thumb, and it stinks of iron. 

“Lovely, isn’t it?”

You flinch so hard that every cell in your body seems to retract at the sound of Kaeya’s voice suddenly piping up from the corner. He stands nonchalantly, arms crossed over his chest, and that characteristic smirk clinging to the edges of his lips. In long, confident strides, he approaches you from the opposite side of the office, reaching out for you. His lithe fingers wrap around your wrist, —both soft, yet firm in grip.

When he brings your fingers to his mouth, you're stunned by the display he makes of licking the pads of them clean. The red liquid stains his tongue before he swallows it down, sucking on your digits for just a moment in what you can only assume is a gesture of good measure. You're too shocked to even think about pulling away.

"Ah," Kaeya clicks his newly cleaned tongue, "it seems we've run into a bit of a problem here, no?"

You swallow roughly, uncertain of what to say or do. You've been caught red-handed, very literally so, and you're at a loss as to where to go from here. A part of you wonders if turning on the waterworks will play out in your favor with Kaeya the way it did with the guards. Somehow, you doubt it. . .

"I'm sorry," spills past your lips before you have the chance to think it through. "I'm really sorry, just please—"

"You're sorry you got caught," Kaeya interrupts, but he doesn't sound particularly upset by it.

He speaks as if making little more than a casual observation.

"I'm sure you've got a tale to tell," he continues, "probably something sad, —a little sob story about your finances sinking into nothingness and a member of the Fatui approaching you with an offer you just couldn't refuse."

You swallow again, and his grip on your wrist tightens ever so slightly. Kaeya can tell by the look in your eyes that he's hit the nail on the head.

"Don't look so surprised," he scoffs, "—you're hardly special. I've met you ten, twenty times before. It always ends the same."

He's said so little, but has eluded to so much, and Kaeya loves the way your hand quivers in his hold.

The knight leans closer to whisper to you, warm tufts of breath fanning against the burning shell of your ear: "I will say though. . . You're the prettiest thief I've ever caught in my office."

He takes note of the way you inhale sharply at his compliment, interpreting it as a thank you.

"Now it's just a matter of how to punish you," Kaeya states. "I could always hand you over to someone else and have them deal with you, but where's the fun in that?"

Fun? Celestia knows that's the last thing on your mind right now as Kaeya's fingers tighten around your wrist again, further cementing his silent point of having no intentions of letting you go any time soon.

"That stuff on the floor," you say in a voice barely above a whimper, "—is it blood?"

He laughs. It's straight from the chest, so genuine and raw that it sends shivers up the length of your spine. To you, this is anything but funny. To him, it seems that he's more amused by you than anything else.

"You couldn't figure that out from the scent?" He questions. "Of course it is. But don't look so frightened. It's not from a human; it's the blood of a boar."

It’s as if he thought that anecdote would make having a bottle of the stuff in his office any easier to swallow, no matter where it originated. 

"And you just. . . Drink it?" You question.

"That's what Vampires do," he nods. "We drink blood. It's in our nature, one might say."

Vampires?

You've long heard rumors about them across Teyvat, but had always chalked them up to superstition and the imagination of parents trying to keep their children in line. Every once in a while, you'd catch wind of a forest animal found somewhere off outside the city with its body drained of blood, —but again, you'd chalk that up to little more than gossip and idle chatter.

"It's been quite a while since I've dranken straight from a human, though."

He could practically smell the surge of anxiety that rippled through your body like the evening tide to the jutting rocks just off Starsnatch Cliff. 

"I-I can fix that," you stammer. "If you agree to let me go, I'll let you drink my blood, and I promise you'll never see me anywhere near your office ever again."

Kaeya laughs again, and it's no less sinister than the first.

"You think you're in any position to be driving bargains?" He snickers.

Even so, it seems to you that he's weighing the options.

"Still," he muses, "I'll admit that I admire your ability to adapt so quickly. So just for that, —lean back against the wall and tilt your head to the side. I'll consider letting you go after I've had a good taste."

You oblige, against your better judgment, knowing that if your family were to find out about any of this, you'd never have the nerve to go home again. It would be bad enough if they knew you'd been speaking with a member of the Fatui, —but to have been driven to steal from a pillar of Mondstadt's community? Completely and utterly unheard of. Just like the real, genuine existence of Vampires is completely unheard of, —but here you are, about to have your blood sucked by one. Today’s been weird, —not that you really have the time to dwell on that right now.

"Don't make any sudden movements," Kaeya warns, brushing some loose strands of hair out of the way to have complete access to your neck. "The pain subsides faster if you keep your muscles relaxed."

Funnily enough, you hadn't considered the pain aspect of it up until now, but there was definitely no turning back. You glance at him, gulping nervously at the brief glint you catch of his fangs that have come out to feed.

"Do it," you whisper breathily, voice quivering as Kaeya's pupil seems to blow, his single iris beginning to swim with a bright, scarlet red color, replacing the striking blue that once resided there.

You barely have half the mind to register the quick breath that graces your skin before he’s sunken his fangs into your flesh. The initial puncture is the worst of it, —something akin to agonizing. It leaves you whimpering, barely able to keep yourself together to remain still. Your back is pressed against the wall, barely able to stabilize you as your knees begin to quake under the pressure and the pain.

Kaeya is quick about the ordeal, no hesitation to be found in his bite. It's been a long while since he's fed directly from a human, and you can feel the eagerness of his mouth when he laps at the puncture wounds on your neck. The rake of his tongue across your newfound injuries soothes you down swiftly enough.

Your blood tastes much better than any forest creature. It's sweet and dulcet, —so velvety as it flows into his mouth and plays on his tongue. Pain soon turns to a sick sense of pleasure, one so intense that it has your eyes rolling around in your skull. Arousal swims in your veins, blood pumping faster and your body in ruins. The wet, warm heat of Kaeya's mouth drowns out all reason and rationale, spreading across your skin like wildfire. 

Pleasure and pain meld together, becoming indistinguishable from one another. A blissful sense of devastation lingers in the wake of it all. The Vampire feeds, getting his fill of you as he listens to the soft moans that fall from your lips every so often. He doesn't need to pull away to see the arousal written across your face, to see the hollow expression of dream-like ecstasy you’re wearing, —although the option is certainly available. Kaeya can smell the surge of hormones running rampant inside you, along with the rampant thump of your quickening pulse. 

Arousal is normal during times of feeding. It’s encouraged by the bite of a Vampire, allowing them to feed faster as blood pumps more rapidly through the heart. 

With your back pressed firmly against a wall in the Cavalry Captain's office, you close your eyes and listen to the silent story of rushing fluid as your blood spills into Kaeya's desperate mouth. He could have easily drained you dry of every last drop, but managed to stop himself before the possibility was even on the horizon. When he pulls away, the corners of his mouth stained red, you watch with half-lidded eyes as he licks it up, making sure that none of your glorious crimson fluid would go to waste.

Lazily, Kaeya looks at you and inquires; “You okay?”

With glazed eyes and a pit burning deep within your stomach, your legs quiver as your back slips down the wall until you're sitting on the floor. They’re practically useless for the time being, thrumming with. . . Something. Whatever this feeling is, you’re wildly unfamiliar with it, and you don’t have the strength to question it. 

"Fine," you answer dreamily, thighs squeezing together irritably.

So fine, in fact, that your clit is throbbing against the soft material of your panties.

Kaeya has seen this before. It’s why he prefers to sustain himself on animal blood, and why he avoids feeding from humans, even when the taste is far superior to the staleness that often lingers in blood that comes from a bottle. Lust after a feeding session is both common and normal; almost to be expected. Some are worse off than others, with people like you being particularly sensitive to the rush of hormones a Vampire’s bite releases.

Moreover, Kaeya rarely indulges in sex. Attractive as he may be, with many suitors ready and willing to rip the clothes off his body and give him the ride of a lifetime, the knight has always preferred to take care of his needs himself. Occasionally, he’ll seek the assistance of a young woman from the city, but even those little rendezvous are few and far between (and never do they entail drinking anyone’s blood.)

Ah, but you. . . There was something special, —something different about you in a way Kaeya couldn’t quite put his finger on. He’d known that the moment you bared your neck to him, offering your blood in exchange for his silence mere moments after learning that Vampires aren’t just mythical creatures of legend. The once clever young woman he’d caught in his office, snooping around through his things, is now sitting on the floor with a pair of puncture wounds on her pretty throat, her eyes staring off at nothing in particular. Far off and dreamy, your legs squeeze together, seeking friction from the little twists your hips make.

Call it instinct or gentlemanly obligation, Kaeya felt it was only appropriate to clean up a mess he had more than a fair hand in creating, —so he gets down on a single knee beside you, brushing a few stray strands of hair away from your eyes.

“You’ve got two options,” he says. “You can take care of. . . All this,” looking up and down your languid body, “—by yourself, or you can ask politely for help and apologize for rummaging around my office without permission. Which’ll it be, darling?”

Your insides ripple at the thought of it alone. It’s absolutely incredible what a Vampire’s bite can do to a lowly human being; one oh so susceptible to the want and need of it all in the fallout.

“I’m sorry,” you all but whimper, mustering up your best pair of puppy-dog eyes in hopes that it would hit any sweet spots the Cavalry Captain could have buried within.

Admittedly, he’s more intrigued by the glaze of lust that hangs over your stare.

“What was that?” He mocks, feigning ignorance as he rises to his feet and takes a few strides back. “I didn’t quite catch what you said there.”

You swallow, ignoring the bitter pricks of pain that have begun to jolt about along your neck.

“I’m sorry—”

“Wrong,” he interjects, clicking his tongue disapprovingly once again. “It’s basic manners to know that one should grovel on their knees when begging for forgiveness.”

The breath that follows his subtle command is shaky as it passes your lips. You give a quick nod before pulling your body forward, suddenly feeling much heavier than before without the weight of the wall to support you. Hands smoothing their way across the hardwood floor and knees trailing behind, you approach him like a scolded pet ready to beg for attention from your master after making a mistake.

“I shouldn’t have come into your office without permission,” you admit, attempting to tune out the incessant thrum of your arousal. “And I shouldn’t have touched your things without permission either.”

“Mhm,” he hums, reaching down to grab your chin.

Kaeya forces you to look up at him from your place just before the space between his long, slender legs.

“And?”

“And I’m very sorry that I did.”

You’re less sorry now than you were five minutes ago. Right now, the only thing you can manage to think about is the heat from the tips of his fingers scorching at your skin, —sending shockwaves through your body that you desperately need to feel alight inside you.

He smirks, a small scoff bursting forth as he studies your pretty face.

“You’re sorry?” He inquires sarcastically.

“Yes,” you reply in a small, needy voice, “I’m sorry. So sorry.”

“That so?” His hands fall away from your face to tug at his pants, allowing his half-hard cock to spring free. “Then go ahead and show me just how sorry you are.”

You glance between his sizable length and his one visible eye. Kaeya takes himself into a loose grip, before snapping another command as you move back to sit on your knees.

“Open that pretty mouth up and let me see your lying little tongue.”

He slaps the warm head against your exposed tongue once, twice, thrice, —then smoothes himself over the wetness, cock sliding with your saliva. It’s not long before he bores of this, however, instead ordering you to put in some extra effort.

“Put your lips around it,” he instructs, sighing softly in relief when you do as he says.

With your mouth suctioned loosely around him, you offer a few sloppy licks to the tip. His hand comes down to rest with the flat of his palm against the crown of your head, encouraging you to continue on; to take him in deeper and let him feel all the dips and grooves of your throat. As he relaxes into you, you go off script and follow the beat of your own drum, so to speak. Kaeya barely stifles a moan as you lick a solid stripe from the bottom of his shaft to the leaking tip of his cock.

“Look at me,” he says simply; to which you comply, staring up at him with the best doe-eyed stare you can muster up with a cock stuffed in your jowls.

Even as the effects of his bite wear off and your neck begins to ache, the lust remains hot and heavy, pooled deep within your gut. The burning embers are stoked further the moment you take him into your mouth again, wrapping your lips around his member before sinking down slowly. A tempo rises from the ashes, a sigh escapes past Kaeya’s lips, and you begin the melody: shallow and easy. As the pressure builds within you both, your sluggish, almost lazy movements become much more fervent, and Kaeya’s hand returns to the crown of your head once more. His long fingers press against your hair, the other cupping the side of your face, encouraging you onward.

You establish a steady rhythm, —one that wracks your lover to the core. Kaeya feels his insides quiver as you bob up and down on him, your mouth nearly ghosting the base of his long cock accompanied by tiny gags that leave your throat contracting around him. He gets louder, groaning and whispering filthy words, mumbling sweet nothings about how pretty you are when he’s buried in your maw. Still, the knight seems to be holding onto a small sliver of self-control; one that you’re determined to strip him bare of before this little escapade comes to a close.

The rest is nothing but messy enthusiasm. You feel him twitch against your tongue, only to solidly press your nose against his naval, swallowing around him to tip him over the edge. It works like a charm.

As you pull away, Kaeya leaves you with a mouthful of hot cum. It’s thick, mild in flavor, and all too easy to drink down.

You make a show of swallowing it, and then of wiping your bottom lip clean. He could likely cum again just watching you in the aftermath.

“Good,” he says simply.

Kaeya then removes his shirt and is halfway through stepping out of his pants before he stops to pause, glancing down at you as if to ask “what do you think you’re waiting for?” Suffice to say, you get the hint.

As you stand naked before him, Kaeya’s lips meet yours for the first time. He moves the both of you back until your ass is pressed to the wall again, offering you stability as he attacks your lips in bruising kisses and laps at the insides of your mouth with little care. He’s like a starved lion; fervent in every move he makes and all too desperate, but somehow composed enough to control the situation with ease.

“Turn around,” he growls against your lips, wasting little time in smoothing his lithe fingers over the plane of your shoulders.

His arm encircles your throat, pulling you close to him as he reaches out with the other hand, demanding that you spit into it. He uses your saliva to slick himself up, then presses your shoulders toward the wall, barely offering you any time to find your bearings before his fingers prod at your entrance.

“You’re dripping,” he laughs.

If you had enough humility in the moment to be embarrassed, maybe you would have been; —but this isn’t exactly the type of situation for that. Rather, you arch your back a little further, hoping it might offer him better access (and thus encourage him to fuck you faster.)

It works easily enough.

Kaeya pushes his saliva ridden cock inside your sopping cunt, presses further into your insides all the way to the hilt. He bottoms out, leaving you gasping as your pussy clenches around the thick of him. Maybe it’s all part of a Vampire’s impact; but you’re seeing stars even before he makes any attempt to move, viewing galaxies behind your fluttering eyelids as he digs his fingernails into your hip. Your head’s up in the clouds again. . .

“Fuck,” he groans, —and you love the breathless twinge that ghosts along your spine when his head falls closer to his chest.

It’s all too good the way your cunt moves around him, welcoming him deep inside. He thought your blood was good, —great—, but this is like stuffing his cock into the gates of Celestia itself. You’re obnoxiously proud of the way Kaeya loses himself inside you, as if abandoning his status as Cavalry Captain just to get a taste of what it’s like to be truly human.

He pulls out slowly, as if to tease you even in his blissed out state, before slamming back in with reckless abandon. It’s so intense that it makes your insides quake, —unbearably intense and much too pleasurable, perhaps in a masochistic sense of the word.

The tempo rises once again. It begins as something quick and frantic, but evolves into something much more desperate, sharper and harsher. The distinct sounds of flesh slapping against flesh fills the room, likely seeping from his office and into the halls; but you’re too lost in the moment to care, especially when Kaeya picks up the pace. When he angles his thrusts just right, hitting all the sweet spots inside you, the both of you are reduced to little more than loud moans and desperate pants.

The air inside his office is no longer tempered. It might as well have been suffocating, but even breathing itself seemed to pale in comparison as a necessity when pitted against the pounding of Kaeya’s cock. 

A sob works its way up your throat, spilling past your lips excitedly. Your core is thrumming, pussy convulsing around him, —loving the way he fills you up as if his very life depends on it. His every move makes your body weaker by the second, pumping you full of adrenaline and ecstasy. It’s all so overwhelming in a way you simply cannot get enough of. You even love the way Kaeya leaves you struggling for breath, gasping for air in between the hammerings he offers right to your g-spot. 

At the edge, Kaeya reaches between your legs to play with your neglected clit, and without warning sinks his fangs into your neck once more. This time, he drinks nothing more than what spills up to the surface, breathing heavily against the skin of your throat. You’re left trembling underneath him, eyes rolling back into your skull as ecstasy explodes from within. He leaves you mewling, cumming on and clenching around him. 

It’s not long before Kaeya follows in suit, pulling out just in the nick of time to spill his seed along your ass. Your knees give way immediately, forcing you to the ground. It was, frankly, a miracle you’d been able to stand the entire time without collapsing before. His bite and the rippling impact of your orgasm have knocked all the wind from your sails, and you haven’t a clue how Kaeya is still standing tall after all of that.

“Yeah,” he breathes out, smoothing his hair back with a single hand, “—I’d say that apology suffices.”

You don’t even need to look his way to know that he’s got an annoying smirk plastered across his face.