Archive of Our Own ^beta

Chapter Text

Childe wakes up on his birthday to the first rays of the sun caressing his face.

The strange thing about it is that Kaeya is up already. The shutters are open, and when Childe stirs awake beside him, Kaeya places a kiss where the sunlight just touched his skin. Instantly, Childe knows that his husband has a plan .

They start the day with a spar in the Whispering Woods. Usually, Kaeya would still be sleep-drunk so early in the morning, but he puts up an exceptionally good fight this time. He even nearly wins. Nearly, because Childe knows his technique just a little too well.

He dodges what would’ve been a vicious blow, grabs Kaeya’s waist, and tackles him to the ground. They fall with a thud. Panting and slick with sweat, Childe holds his water blade to Kaeya’s throat for a few heartbeats before dissolving it.

“Looks like you’ve won,” Kaeya says breathlessly. “Happy birthday.”

Childe laughs. He would’ve been satisfied with either outcome; what matters is that Kaeya never serves him his victories on a silver platter. He has to work for them. To earn Kaeya pinned under him, hair tousled and glued to his forehead, split lip bleeding… On impulse, Childe leans down to lick it.

Kaeya tastes like salt and steel, and within moments, they’re lost in each other. If it were up to Childe, he would fuck Kaeya right there in the grass. But when he reaches down to fumble with the buttons of his pants, a hand firmly closes around his wrist.

“Not here.”

“Please? I’ll make it quick,” he bargains. “You don’t have to do anything, just let me–”

“Ajax, no. I have something planned for the evening. Trust me, you’ll like it better than a quick fuck in the woods. Besides, Amber might be patrolling already, and I would rather not jeopardize our only Outrider’s sanity.”

Childe pouts, but he knows Kaeya is right, whatever he has in store. They make it home and have a quick shower before breakfast. Childe is tempted to misbehave again (who wouldn’t be when faced with a wet and naked Kaeya Alberich), but the promise of an evening surprise makes him keep his hands to himself. Mostly.

The rest of the day passes in a blur. They both have reports to write, but neither of them cares, so after breakfast, they take a walk around Windrise. It’s a hot day, but more than breezy enough to make it bearable. Childe catches a few fish for dinner in the river. When they get back, Kaeya takes a nap on the couch after his lack of sleep catches up to him, and Childe sits at the table to open letters from family and friends. He manages to pen three responses before he has to get started on dinner.

Kaeya wakes up in time to help him with the cooking– as much as Childe will let him, that is. The kitchen is small, so they keep bumping into each other. Not that either of them minds. But at one point, Kaeya’s hand braces against Childe’s waist as he moves past him, and Childe forgets what he’s doing for a few moments.

After they eat, Kaeya leaves the dirty dishes to soak in the sink and winks at his husband.

“Why don’t you go post your letters while I get some things ready, hm?”

Childe knows what it means. A part of him wants to refuse (he wonders if he could use his birthday to garner pity), but he knows how Kaeya is with surprises, so he sighs and prepares the envelopes. He has to make a conscious effort not to run on the way back.

“I’m home,” he shouts once he locks the door behind him and bends down to unlace his boots.

“Come find me, then,” is the answer.

And oh, Childe likes the sound of that. He hurries to their bedroom, finds the door slightly ajar, and pushes it open.

If the sweaty, disheveled Kaeya that morning was a lethal sight, Kaeya in lace brings Childe back to life. He’s lounging on the bed in a midnight blue lingerie set, one he must’ve bought especially for this occasion, because Childe would remember if he’d seen it before. The room is lit with so many candles that it looks as if the sun never set. And still, Kaeya is undeniably the brightest star there.

“Holy shit,” Childe manages to say.

Kaeya uncrosses and recrosses his stockinged legs, clearly aware of how intensely his husband watches the movement of his thighs.

“Worth the wait?”

In lieu of an answer, Childe undoes the clasps on his shirt and throws it in the corner. Normally, he’d try to fold it at least somewhat neatly and leave it on a chair, but this is an emergency.

“I could help you get out of these clothes,” Kaeya offers.

“No time,” Childe huffs, frantically unbuttoning his pants and letting them hit the floor. “I need to be inside you right now .”

And then he hits the floor, having tripped over said pants. Kaeya sits up abruptly.

“Oh dear… Are you sure you don’t need a hand?”

Childe sighs.

“Fine, I might’ve been wrong about the fastest course of action.”

Chuckling fondly, Kaeya pulls him up onto the bed and helps him undress down to his boxers. Now that Childe sees him so close, he decides to slow down and appreciate the finer details. Such as Kaeya’s deep blue eyeshadow with gold glitter that looks like stars in the night sky. The way the panties are so small that his half-hard cock is peeking out over the lacy edge. How fucking incredible his tits look under the sheer bralette. Childe is already drooling.

He decides to make good use of it and mouths at one of Kaeya’s nipples through the fabric, prodding at the other with his thumb. They stand to attention in seconds. Kaeya arches into his touch, fingers tangling in Childe’s hair.

“Mm… sensitive…”

“I can tell. Do you think I could make you come just by playing with your tits again?”

“You probably could,” Kaeya admits breathlessly.

“But I’m not so selfless tonight.” Childe gives his chest a few more licks, then pauses to spit in his hand. He reaches into Kaeya’s panties and wraps his fingers around his growing length. “Just gonna get you ready for me.”

Kaeya bucks his hips, already chasing after it.

“Without even… hah… unwrapping your gift?”

“Oh, not when it comes in a package this pretty.”

Childe strokes him slowly, reveling in Kaeya’s little gasps and twitches, in the way his cock grows harder under his experienced touch. At the same time, he peppers kisses along Kaeya’s jaw. He’s trying not to rush now, really, because Kaeya deserves good foreplay for all his effort. But… Childe has been craving him since the morning. And now heat pools in his core again, urging him to make this absurdly beautiful man his. To claim him.

It’s not long before Childe’s fingers slide lower, beneath the swell of Kaeya’s balls, and find him already slick and relaxed.

“You even prepared for me?” His voice comes out hoarse. “Fuck, Kaeya…”

“Yes, that’s the plan,” his husband replies cheekily and moans when Childe bites his neck for that. “I had a feeling you’d be in a hurry.”

Childe can’t even try to deny it after that close encounter with the floor. Fortunately, his Vision is within reach, so he can cover his fingers in thick hydro and press inside Kaeya. The angle is far from ideal, but Kaeya’s body still welcomes him with ease.

“Alright. Fuck. I don’t even have to do this, do I?” he mumbles and scissors his fingers just once for good measure. Kaeya gasps, and his grip on Childe’s hair tightens. “I’ll stop stalling, then.”

“Please do,” Kaeya purrs.

He winces a little when Childe pulls his fingers out and leaves him empty, but he composes himself fast, leaning back against the pillows with quiet elegance. Childe’s eyes never leave Kaeya as he tugs his soaked boxers off and shapes hydro energy into a cock and harness with practiced ease. He knows the size and curve Kaeya prefers by heart. The straps secure it to his hips, the base pressing snugly against his real dick.

And then– finally– Childe pulls these tiny panties to the side, lines up with Kaeya’s entrance, and sinks into him.

“Ahh… I’ve been waiting for this all day,” he sighs.

“Me too.” Kaeya wraps his legs around Childe’s waist and gazes up at him through half-lidded eyes, mouth slightly open. He looks like he’s asking to be ruined. “Come on, birthday boy.”

Childe leans in to crush his lips against Kaeya’s as he starts to fuck him. The hydro is an extension of him, which means he can feel the way Kaeya clenches around his cock, eager and pliant and yet still deliciously tight. His mouth opens for Childe just as easily. Childe tries to synchronize the rhythm of his hips and tongue, but it feels too good, and he has to slow down to avoid coming early.

The cut on Kaeya’s lip has barely closed up. He arches his back when Childe bites it open, already craving the sweet, metallic tang again.

“It hurts,” he says between moans, but it sounds like anything but a complaint.

“Oh yeah?” Childe licks up the blood like the rare delicacy it is and buries himself in Kaeya to the hilt, as if to prove a point. “What’re you– hah– gonna do about it?”

Kaeya bites him back, of course. Childe’s hips stutter, and he practically whimpers into Kaeya’s mouth. This only encourages his evil, gorgeous husband; he tilts his head to sink his teeth into Childe’s shoulder and drags his nails down Childe’s back.

“... Fine,” Childe growls. “You asked for this.”

He moves Kaeya’s legs from around his waist to his shoulders so he can pound into him properly. The sound Kaeya makes in response goes straight to Childe’s dick. His pace is relentless now, teeth gritted as he tries not to come yet, because this has turned into a competition. But it seems his opponent is not far behind. Kaeya slips a hand under the lace to touch himself in time with Childe’s thrusts; his eyes are closed, lips parted as increasingly desperate sighs fall from them. And because all is fair in love and war, Childe brings out the heavy artillery.

“Gonna come for me, pretty boy?” he pants. “Want me to fill you up?”

“Please,” Kaeya begs.

And Childe follows through with his promise, releasing the warm hydro in gentle waves. Kaeya gives his cock a few final strokes and comes with a gasp, shuddering and clenching around Childe as he spills over his own stomach. Childe is so close, wants to keep fucking him so bad. But he knows Kaeya is more sensitive to overstimulation than he is, so he forces his hips to still and just watches, mesmerized.

“Mm… I didn’t expect to like it so much when you do that,” Kaeya says once he catches his breath.

His voice is ruined, and so is his makeup. But in Childe’s opinion, that only makes him hotter. Everything about Kaeya drives him crazy, from these strong thighs crowned in lace to the dangerous glint in his starry eyes. To his scars, to his swordsmanship, to the softness in his voice when he talks to any of the children of Mondstadt. Childe is so down bad for him, he might’ve reached the Abyss again.

“Lucky for me,” he murmurs, “because I love coming inside you.”

“Did you actually come, though?”

“Almost. Held back a little because I wanted to get you off first.”

“But today is your day.” Kaeya reaches up to stroke his face. “You made me feel so, so good, now let me repay you with interest. What would you like?”

Childe ponders the question for a moment. For some reason, his brain supplies the memory of Kaeya’s hand on his waist that morning. Then other instances of his hands on Childe’s waist, gripping hard enough to bruise… He dissolves the hydro harness and clears his throat.

“... Can you get hard again?”

Kaeya smiles. He’s already shifting positions, maneuvering Childe to lie on his back next to him.

“Give me a minute. Or a few.”

Chapter Text

Childe is good at a number of things; staying still is not one of them. He lets Kaeya lay him down, sure, but then he grabs a fistful of navy blue hair and yanks him closer by it.

“Hey now…” Kaeya tries to sound stern. Maybe on someone else, it’d have the intended effect. His lost cause of a husband, however, only hears encouragement. “Still haven’t learned your lesson about patience?”

“I was very patient just now.”

“You were, and I intend to reward you.” Kaeya strokes Childe’s face, fingertips dancing along the edge of his jawline, before he lies back down next to him. “But you have to play nice, or I might change my mind.”

“Tease,” Childe complains halfheartedly.

Kaeya only hums in response. His hand traces the twin scars under Childe’s pecs, the stretch marks on his stomach, the ginger happy trail. Finally, it touches where Childe wants it most. Kaeya chuckles, satisfaction heavy in his voice.

“You always get so wet from fucking me.”

“It’s the hydro,” Childe lies.

“Is that so?” Kaeya slides two fingers inside him with absolutely no resistance, and Childe’s breath hitches. “Even here? How lucky for me that you have a Vision, otherwise I’d never get such a reaction out of you.”

Childe frowns.

“You know that’s not…”

“Not because of me, I know. I get it.”

Kaeya attempts to take his hand away, but Childe grabs his wrist, pushes Kaeya’s fingers deeper inside him and grinds his cock against his palm.

“Fine,” he pants, “since you want me to say it so bad… You’re so unfairly hot, Kaeya, it drives me crazy. Just hearing your voice is enough to make me soak through my boxers. And if I get to see you dressed like this, just for me? Taste you, feel you– hah– clench around me, while I have these pretty legs on my shoulders… Of course I’m wet. Is that what you wanted to hear?”

And Kaeya might be the one who’s knuckle deep in Childe, but he looks downright bashful now, face alight with a golden glow.

“It is nice to hear you say it,” he admits quietly before composing himself. “Ahem… Since we’re going for another round, you can come for me twice, can’t you?”

Childe tries to answer, but it comes out as a barely coherent whimper when Kaeya’s fingers curl inside him.

“I know you can. Two is no challenge for you.”

Which, yeah, Childe’s high score is something closer to six. A fact he is rather proud of, and which seems to have left an impression on Kaeya, if his enthusiasm for making him come multiple times is anything to go by. They’re not aiming for a number so high this time– but when Kaeya starts fingerfucking him in earnest, Childe remembers exactly why he lets him coax as many orgasms as he wants out of him.

He pulls Kaeya into a messy kiss. Spit and blood from their bitten lips dribble down their chins, and neither of them cares. Childe, for one, is too busy moaning into Kaeya’s mouth and angling his hips so that the base of Kaeya’s palm hits his cock each time these long fingers plunge inside him.

He doesn’t last long. Kaeya knows his body too well; he smirks against Childe’s lips as his fingers curl up and press , and Childe gasps.

“Fuck, I’m gonna–”

“I know,” Kaeya murmurs. “Come on, give me all of it.”

And Childe is done for. His nails dig into Kaeya’s shoulder as pleasure ripples through his body and trickles down Kaeya’s hand. While a modest amount, it’s enough to leave a damp spot on the sheets. Later, when his mind clears, he’s going to regret not having the foresight to put a towel down. But right now? Nothing matters, except for the blissful way Kaeya’s fingers move inside him, coaxing another few drops even when Childe thinks he’s been wrung dry.

“Good boy,” Kaeya mutters when Childe is done clenching around him, and Childe laughs breathlessly.

“ You’re the one who… hah… made me leak! Good boy, Kaeya.”

“Don’t turn the tables on me,” his husband protests, but when Childe reaches down between his thighs, he finds Kaeya almost fully hard again.

“Right, it was supposed to be you turning the tables on me , huh? But you like the praise. And so does your dick.”

Kaeya opens his mouth to say something and ends up just sighing. He still looks like he’s glowing in the candlelight. Childe may be out of breath and twitching with aftershocks, but nothing could stop him from running his mouth, especially when faced with tangible proof that it’s working .

“Well? Are you going to fuck me or was all the talk about making me come twice just empty promises?”

“Have I ever lied about this particular thing?” Kaeya starts sliding the lace panties down his legs. Childe is ready to change his tone and beg him to keep the stockings and bralette on– but he doesn’t need to. Maybe Kaeya’s in a rush, or maybe he can read his mind. “You haven’t been as nice as I asked, but only today, I’ll make an exception and reward you anyway.”

He spits in his palm and strokes himself to full hardness. Childe immediately spreads his legs wider, and Kaeya chuckles as he guides himself to his entrance. When he finally slides inside, Childe lets out a sigh of relief.

“Took you long enough,” he taunts and rocks his hips, trying to take Kaeya deeper.

Kaeya’s smile bridges the gap between fondness and exasperation.

“You are so going to get it.”

“I’m waiti– ah –”

The thrust of Kaeya’s hips is precise, almost calculated. Sometimes he likes to grind into Childe lazily, prompting complaints along the lines of I’m not made of glass, fuck me like you mean it. But not this time.

“Sorry, could you repeat that?” he teases, pulls halfway out, and slams back in. “I couldn’t quite– mm– hear you.”

“Oh, fuck, just like that,” Childe gasps. He’s still sensitive from his previous orgasm, but that only amplifies the pleasure. “Kaeya, please–”

“I love how little it takes to make you beg,” Kaeya purrs and shifts, pinning Childe’s thighs under his to fuck into him even deeper. “Strong, fearless soldier… reduced to– hah– a whimpering mess the moment my dick is inside him… you really needed this, huh?”

It feels too good to deny it. Childe wraps his arms around Kaeya and presses him close, reveling in the sensations of delicate fabric and warm, wet skin. A litany of sighs and slurred praise leaves his lips. But even as both of their voices fill the air, Childe can still hear the obscenely slick sounds of Kaeya’s cock plunging into him. 

And yet, despite the smug talk, Kaeya is just as affected; Childe knows it. He can feel the rhythm of his hips becoming more erratic, more desperate.

“Are you close?” He asks, voice ruined, as if he doesn’t already know.

“Yeah…” Kaeya sounds every bit as wrecked. “But I want you to come first.”

It’s not a command, hardly even a request, but Childe chooses to interpret it as such. He locks his legs around Kaeya’s waist and flips their positions. Kaeya lets out a mildly surprised yelp, but doesn’t fight it. Childe refuses to let him pull out even for a second. As soon as he gains leverage, he grinds down, taking Kaeya to the hilt.

“Then promise,” he pants, “that you’ll come with me.”

“Oh, Ajax– I will, I’m almost there–”

Biting his lip, Childe reaches down and rubs his cock between two fingers as he continues to rock his hips against Kaeya’s. The angle is lethal; he barely needs any external stimulation to push him over the edge. He comes with Kaeya’s name on his lips. Somehow, it’s even more intense than the first time, and his entire body tenses as waves of pleasure crash at his core. 

Kaeya grabs his waist and thrusts up into him a few more times before he follows suit. If Childe wasn’t already coming, that firm grip and the whine escaping Kaeya’s lips would surely do him in. He rides out his orgasm until Kaeya softens inside him. Childe sighs as he lifts himself off of his cock and immediately begins to miss the fullness. Kaeya’s come leaks out of him in thick ropes.

“You came a second time and still gave me so much…” he murmurs, bends forward to brush sweat-soaked hair strands away from Kaeya’s face, and kisses him. “Almost as if you’re trying to knock me up.”

But naturally, they’re prepared. Childe reaches into the nightstand drawer for a vial of contraceptive potion and downs it while Kaeya just stares at him, mouth slightly open.

“Careful what you say,” he finally manages, running his hands up Childe’s sides. “If my dick wasn’t out of commission for tonight…”

“What a shame.” Childe falls on top of him, nuzzles Kaeya’s neck and tangles their legs together. “Just to be clear, I’m not complaining. You were amazing.”

Kaeya holds him tight.

“Wanted you to have a good time.”

“We started the day with a spar and ended it with… probably multiple hours of sex, I don’t even know. But I think it’s safe to say I had a really, really good time.” Childe smiles against Kaeya’s skin. “Let’s have a rematch in the fall.”