Archive of Our Own ^beta

"Kaeya, you're drunk. Please have some water and wait until I can take you home tonight." 

The marsupial beast feels his ear flick in irritation. Were his tail not so stiff he could swear it would flick like a cat's, too. Which is what Diluc's tail is doing behind the bar he's serving Kaeya at. The damned cat always acted like he knew what was best for Kaeya. Not like he would complain, he liked having an alpha to dote on him even if they weren't mated, much to the alpha cat's dismay. He remained respectful of Kaeya's boundaries, though, and would vehemently avoid biting down into the thylacine's scent glands during sex. 

Kaeya took another swig of wine from his glass before Diluc could protest, the worthless feeling clawing up at his throat needing to be drowned. He slams his glass down with a deep sigh, glass emptied save for the few stray droplets of sickly yellow white wine trickling down the inside of the glass. He hears the cat sigh before sliding a glass full of water into his eyesight. He doesn't know how or why Diluc stays with him, self-destructive as he is.

Maybe Diluc was just as destructive too, just in his own fucked up way.

Hours pass before the chattering and clinking tankards of tavern patrons dwindles to nothing more than the sound of Kaeya's heels tapping the wooden barstool and the tapping of Diluc's shoes on the wooden floor. He hears the cat walk to circle behind him, the tapping stopping just at his sides as the alpha leans down, chest to his back and large gloved hands gripping the bar top in line with the marsupial's shoulders. Kayea turns his head to look at Diluc, a slight drunken glare sent the cat's way. Diluc sighs before beginning to pepper the omega's shoulder blade in kisses. 

"Come on, Kaeya. Time to go home." Diluc moves his hands to rest on Kaeya's waist, gently tugging the omega in the direction of his chest to coax him into standing. Slowly, Kaeya turns around in the stool, planting his feet firmly on the ground and shakily standing into Diluc's waiting embrace. He hears the cat purr, nuzzling into the thylacine's scent glands as he holds the omega close. 

"I've already got a carriage to take us home, let's go." He presses a kiss to Kaeya's cheek before leading the knight out of the tavern, the omega too drunk to properly respond. He waddles behind Diluc, giggling softly as he stares at the ground, dragged by the hand like a toddler while his alpha leads the way. He feels himself be stuffed into the carriage and into Diluc’s lap as the vague sounds of a door latching closed and chattering alphas lulls him into darkness, the alcohol finally taking hold of his sleep.

“Kaeya, hey. Wake up.” The marsupial beast feels the gentle itch of the cat’s claw against his cheek, gently tingling the skin over the trail Diluc moved his finger. He scrunches his nose at the feeling. The tickle of Diluc’s fluffy tail over his ankle keeps him from just falling asleep, too tired to properly acknowledge his alpha despite his slowly sobering mind. 

“Kaeya, we’re home. Let’s go inside.” 

The damned cat starts to drag him out of his curled and comfortable posture. Sure he looked like a shrimp but it was more comforting to be curled up and small. He felt invisible that way. He barely registers getting dragged inside and placed onto his plush bed; hearing the door to his bedroom latch snaps him out of his stupor, too caught up in the feeling of uselessness and disposable intentions to care. 

Kaeya stretches before sluggishly stripping himself of his clothes and laying spread eagle on his covers. He knew he wouldn’t be able to sleep for about two hours at least, knowing of Diluc’s habits late at night. 

Like clockwork, Diluc saunters into his bedroom at around 2 a.m., not even sparing the omega a “hello” before he begins to strip himself of his nightpants, handling the omega into a good position to use him with. At the end of it all Kaeya’s left with his ass in the air, cum dripping out of his hole as Diluc leaves to his bedroom, not even giving Kaeya a chance to respond before using him as his own living sex doll and dumping him back into his lonesome. 

How many times had Diluc done this to his own omega, now? He forgot.

Kaeya can’t remember how long it’s been since he and Diluc got back together, the time just turning to mush underneath the routine soulless sex and the copious amounts of alcohol. He figures Diluc doesn’t care enough, either, if the insistence on not even sharing a bed was anything to go off.

He told Diluc no mating when they started dating, but he didn’t think he’d be reduced to a fleshlight as a result of it. He tells himself he deserves this, being the Abyssal traitor he is and all. 

He’d never pick the Abyss over Mondstadt. His alpha needed his favorite toy, after all. His omega to comfort him.

Night after night this wordless dance continues, Diluc dropping a drunk Kaeya off in his bed before coming back to fuck him at midnight, not asking how the omega is feeling. Two winters pass before Kaeya’s mind stops slurring together the days and nights; he’s pushed into the sheets with his ass in the air and a knot in his hole when he snaps out of his mental sludge, the blood trickling down his neck preventing him from falling back into it.

Diluc bit him. Tears flow freely down the omega’s cheek as his lips quiver, a pathetic whimper and tremble of his legs wetting the sheets beneath him. 

“Luc.. why did you..?” Kaeya barely manages to squeak the words out, throat stiff and swollen with fear. His only response is a feral growl from the alpha holding his back up, the fangs vibrating in his skin causing him to drip more of his own cum onto the linens. A disgusting way to climax, but he can’t control what his body’s response is. It doesn’t help that the mating bite is causing Diluc’s rut to affect his hormones more than usual, now. 

He sobs, words closing his throat when Diluc finally comes to, the guilt having a profound effect on the alpha, who finds himself now doting over the mating bite over Kaeya’s throat. He snaps away when Diluc tries to hold him in apology, curling onto himself and whimpering thick tears into the pillows underneath him. 

Diluc leaves back to his bedroom, not saying a word as the bedroom door latches Kaeya into encroaching dark and lonesome. He always will just be a cocksleeve with no purpose for Diluc, nothing more and nothing less.

Bewildered, the omega sits with eyes wide in abject horror, staring at the results in his hands. His life was ruined.

Kaeya’s weeks have been marked with constant stomach pains and nausea. He’s been barely able to get through paperwork at his desk during work days and Diluc’s been forcing him to be sober for fear of making his symptoms worse. He hurt so much, he barely got through sitting on the toilet long enough to just piss on a little stick.

Kaeya was pregnant. Tears stained his cheeks as he left the bathroom, taking the rest of the day off with Jean’s permission. He packs his things up and leaves his office, stopping by Sucrose’s lab on the way out of headquarters. He gets his pill concoction and hurries himself back to the Dawn Winery, making damn sure to get home before Diluc arrives from his shift at the tavern. 

He scrambles to the kitchen for a glass of water, maid staff scurrying out of the omega’s way as he gets his glass and runs to the upstairs bathroom. He locks the door tight and tears open the packet containing his pills, popping them all in his mouth without a care and gulping down too much water in his desperation to swallow the small balls. 

Within minutes Kaeya’s stomach tightens and cramps horribly, curling tightly into himself as he feels the effects of the medications working his body to their whims. After the ordeal he slumps forward, panting into his knees as he recovers. His body is empty and barren once more. He cleans his mess and returns to his bed, sobbing into the pillow in shame. He was the worst omega an alpha could ask for, conceiving out of heat and promptly being done with it immediately. Diluc would kill him if he found out. 

He doesn’t tell Diluc why he was home early, just lets the alpha fuck him like normal and leave. He was alone again. Being alone is the only thing Kaeya can count on these days, isn’t it? Pathetic whelp.

Kaeya’s drinking rampantly spikes up again as soon as Diluc allows him to, leaving him too drunk to speak to his alpha most nights. He’s drunk even through his heat, though he’s vaguely aware of Diluc knotting him nightly through the week he’s worked up with hormones. He doesn’t end up pregnant again, thank fucking Barbatos. 

Kaeya’s health declines rapidly over time, leaving the omega a shriveled shell of his former self. Diluc didn’t let him drink anymore, but that didn’t seem to make a difference. Kaeya suffered all the same. Diluc has his hand to his pale forehead, brows knotted in worry at the state of his omega. Kaeya can see the tears his alpha is too stubborn to shed and a feeling of guilt washes over the thylacine. Diluc’s ears are flat to his head and his tail is curled tightly over himself, muffled sobs shaking the alpha’s torso. 

“Kaeya, what’s happening to you? Please, I can’t lose you, Kaeya.” Tears finally begin to fall freely down Diluc’s cheeks, staining his fluffy tail a dark, wet color. “Kaeya..”

The omega itches the skin of his pouch, staring blankly at the ceiling. Maybe in another life he could have nursed joeys of his own in this pouch, but he’s too ill to sit on his own let alone try again for a joey. He exhales loudly, giving his alpha a forlorn stare and a guilty smile.

“It’s our bond, Luc. The curse of Khaenri’ah makes any mating bites from Tevyat natives a slow toxin to thylacine beasts. It’s why I didn’t want to have you claim me. I’m sorry for deceiving you.” The marsupial beast averts his gaze, not wanting to see Diluc’s face scrunch up more in grief. He’d be dead soon anyway. He hears the cat wail and fall to the ground, a single tear falling down his cheek as his hollow apology falls freely from his dying lips. 

“I’m sorry, Diluc.. I was too much of a coward to keep that pup last year.. From after your rut.” 

“W-what-? Kaeya?” Diluc gasps, shaking even more. “Kaeya, please don’t tell me-”

Kaeya nods, turning his head away as he hears the cat wail louder, another long-kept secret out in the open. Kaeya really was the worst thing to ever happen to Diluc.

Diluc doesn’t leave Kaeya’s bedside that night, and Kaeya never wakes up that morning, succumbing to his own failing body. 

Days felt bleak without Kaeya, but Diluc lived on. His funeral was a grand affair, Diluc sobbing into his hands the entire procession. He felt so hollow, so empty. He wished he could have Kaeya back, and were it up to him he’d pluck him from the afterlife and back into his arms with no hesitation. 

It's only when Diluc searches through Kaeya’s things for storage that he learns his omega kept a diary. Sitting down and curious, Diluc flips through the pages, reading Kaeya’s experiences. 

‘Jan. 7,

Last night he did it again. Why can’t he say hello or ask if I’m even horny before fucking me like a living toy? This happens every night. I suppose it’s what I deserve for being such a pathetic whelp. Cavalry Captain my ass.’

No. No, Diluc was a good alpha. He was good to his omega.

‘Feb. 5,

He bit me. We’re mated, and I’m going to die soon. I told him not to do this, for fuck’s sake. Guess now the Abyss can’t get to me.’

Tears stain the pages of Kaeya’s diary as Diluc continues to read through. Each day of Kaeya’s pains, the stressors, the numbing of the alcohol. It’s all documented. Even the nightly fucks from Diluc. Diluc really was a bad alpha. 

‘Mar. 10,

I’m pregnant. I’m pregnant and I’m dying. I’m a failure, a shameful omega. After I write this sentence I’m going to get rid of this, I can’t raise a joey living the pathetic life I do now. I can’t bring shame to my child. I’m sorry, Diluc.’

Diluc shoves the book closed, tears clouding his vision as he ties it tightly closed, throwing it deep into the piles of Kaeya’s belongings and throwing everything into the attic. He falls to his knees and sobs loudly, shame crushing him flat against the floor. He hurt his omega, and failed to notice his shortcomings. And now his omega was gone, and he couldn’t make his mistakes right. He could only atone for the theft of a life in one way, though.

The next morning Adelinde staggers back in horror, dropping all of the breakfast dishes to the ground as she screeches. The sight of Diluc dead over his desk, knife lodged deep into his heart greeting her eyes as the alpha’s blood stains the mahogany desk and Sumerian rugs deep and dark, his red ruby eyes dulled to grey. 

Maybe, just maybe, Diluc could meet Kaeya in the afterlife where they needn’t worry about some divine curse over their ancestors.