Kei hadn’t even wanted to go out tonight. He was barely leaving the museum when his phone rang, the caller ID reading Kuroo’s phone number, and he’d immediately rejected the call. However, not even two seconds later he received a text with the simple words: “We have freckles with us already so you might as well just come over now instead of fighting it.” So he did. And that familiar annoyance and quick temper has returned, only fueled by the loud music bumping in the over-crowded club that Bokuto and Kuroo dragged his omega to-

There it is again. Yamaguchi isn’t his. He isn’t Kei’s, and he knows this. Even still, in his head, he calls him that. He doesn’t know when he that started, just that he never stopped, and he doesn’t see any harm in it; after all, anyone who’s spent more than a few hours with them can clearly see Kei’s laid his claim on Yamaguchi even if he hasn’t actually marked him. Or even tried to court him. His influence is all over, however, from the clothes Kei buys him just so he can scent them before he gifts them to the fading hickeys Yamaguchi asks Kei to give him before they go out to deter alphas from hitting on him when they’re clubbing. 

Even still, those only seem to work if the other person knows them, and isn’t some stranger in the club. To strangers, Kei’s scent and the hickeys he peppers on Yamaguchi’s neck are just hints of a promiscuous omega, a tease who gets busy with more than one person in one night- and they tend to get angry when their advances are rejected by a “slut.” 

Kei doesn’t know when he lost Yamaguchi, just that he’s been increasingly more annoyed by his other friends as they progressively get drunker. And so he does what he usually does when he gets fed up with them: goes to find Yamaguchi so he can leave. It takes a long moment to find him, and when he does, he doesn’t like what he finds. 

He can’t hear over the music and the loud conversations surrounding them, but he can see the snarl on the alpha’s face as he leans far too close to Yamaguchi. The omega -his omega- is leaning as far away as he can, but his back is pressed against the wall with nowhere else to go. It takes three seconds to get from the bar to where they are, just in time for the alpha to reach a hand up Yamaguchi’s skirt and promptly get punched in the jaw by Yamaguchi. Immediately the area around them clears around them so Kei can step in between them. 

“You bit-” 

The alpha goes to punch back, but freezes when he sees Kei standing there. “You’d really punch an omega that just hit you so hard you had those cartoon birds flying around your head? That’s kind of pathetic, man.” 

“Who are you, this little slut’s babysitter? Why don’t you tell ‘im to-” 

“I’d stop right there, or I’ll let him loose on you again. Do you want an omega to knock you out?” 

The alpha growls, but he backs off, flicking them off once more before he disappears into the crowd. Kei turns to Yamaguchi as the people immediately around them dissolve back into the club mentality, ignoring the two as soon as the drama is over. When Kei turns around, Yamaguchi’s fist is still clenched, skirt ridden up just the slightest, and he’s shaking. 

“Yamaguchi, let’s go.” 

“What? I- I’m fine, Tsukki. Let’s just go find the others,” 

“I just left them, I was coming to find you anyway.” 

“But I wanna stay,” 

“And get groped by some stranger again? I don’t think so.” Kei says. 

Yamaguchi huffs. “Come on Tsukki, please? I barely have a buzz, I-” 

“And if you get any drunker, you’re gonna get taken advantage of by some random alpha.” 

“And what if I want that?” 

“I- What?” Kei’s eyes narrow and he glares at Yamaguchi, stepping closer to him. “You’re okay with just anyone taking you home? What if one of them marks you? What if they get you pregnant?” 

Yamaguchi crosses his arms and glares right back. “And what if they do? It’s not like you are.” 

Something in Kei snaps then, and he growls, taking Yamaguchi by the wrist and pulling him against his chest. He isn’t one to use his alpha status above an omega, but he can’t help himself as he commands Yamaguchi with his alpha voice, “We’re leaving. Now.” 

Yamaguchi doesn’t protest as Kei drags him out of the club, and Kei ignores the whoops and hollers from a drunk Bokuto and Kuroo, both of whom are trying to reign in a drunk Hinata before he climbs onto the bar and shows all of Sendai the dance moves he’d learned in Brazil. Once out of the club, his senses sharpen and he feels a bit better, but anger still boils in his chest as he drags Yamaguchi down the street and to the closest train station. After swiping their metro cards he takes Yamaguchi and pins him against the wall, kissing him roughly while they wait for their train. 

“Is this what you wanted? Attention from me? Is that why you wore this little number and went off and almost got yourself groped in the club by whoever you could get to touch you so I would get jealous?” 

“M- Maybe,” Yamaguchi murmurs against Kei’s lips, gasping when Kei’s knee slips between his thighs, arms hiding him from the rest of the underground station. “I was tired of your fucking pretending like there isn’t something between us, so I figured I’d give you a push. Is that so wrong?” 

“It is when my omega is backed into a corner with a hand up his skirt by someone that’s not me.” 

“So you admit I’m yours?” 

“Of fucking course you are! When have you ever not been?” Yamaguchi swallows thickly, his wide-eyed gaze looking at Kei like he hung the goddamn moon, and Kei growls. “As soon as we get back to my place I’m fucking you so goddamn hard and you’re getting a bond mark right,” he nips at the junction of Yamaguchi’s neck and shoulder, “There. Understand? No one is going to mistake you for single after this.” 

“Y- Yes, alpha.” 

“That’s what I like to hear.” They continue to kiss while they wait, and once again when their train arrives. Once they reach their stop, Kei’s hand once again finds Yamaguchi’s wrist and he pulls him along, feeling a little guilty when he sees it’s bright red from being grabbed so roughly; it’ll definitely bruise before the night is over. He doesn’t have time to feel guilty, however, because Yamaguchi’s hand slips into Kei’s front pants pocket and pulls his keys out of it, unlocking his apartment and pushing him inside. Kei grins, pulling Yamaguchi by his collar into a kiss as they scramble to take their shoes off while still kissing. “Feisty now, huh?” 

“Just impatient. I’ve been waiting for this moment since we were seventeen.” 

Kei groans against Tadashi’s lips. “You mean I could’ve been fucking you since second year? That was six years ago,” 

“I didn’t think you liked me back until, like, six months ago Tsukki! And I thought you would make the first move, since you’re an alpha.” 

“You know I’m just as stubborn as you, did you really think I’d give up my pride and confess?” 

“Hey, it’s not my fault you’re stupid. Now are you going to claim me or not?” 

“You don’t have to ask twice,” Now out of their shoes, Kei lifts Tadashi and carries him down the hall to his bedroom. He has half the mind to fuck him right on the floor in the genkan, but he at least has the sense to make sure Yamaguchi is comfortable while he fucks his brains out. Once in his bedroom, he drops Yamaguchi on the bed, his hands fumbling with the buttons of his shirt. Yamaguchi pulls away just the slightest to pull his top off, wiggling out of his skirt while Kei shucks off his own shirt and begins undoing the buttons on his slacks. He growls when he sees Yamaguchi’s nearly naked form underneath him, the light pink boxer briefs damp and tenting his dick. “Fuck, you’re so gorgeous, you know that?” 

“That’s coming from you? You’re a literal god, Kei.” 

Something about Yamaguchi calling him by his given name screams to the primal side inside of Kei. Nipping at his lips, Kei’s hands find Yamaguchi’s hips and pulls them flush against his. “You’re so fucking hot. I’m going to make sure the only think you can say is my name.” 

“Yes, please.” Yamaguchi whispers. Resisting the urge to rip Yamaguchi’s underwear, he slides it off as quickly and as gracelessly as possible, losing his cool immediately when the scent of slick unhidden by clothing hits his nose. He pulls away to get a good look at Yamaguchi totally naked, now, and he growls. 

“You’re dripping. Have you been slicked up the whole way home, or did I just work you up in the few minutes we’ve been back home?” 

“Th- The first option,” 

"Well I’m going to treat you so good, don’t you worry. I know I could probably slip right in with how wet you are right now, but I’m gonna prep you, okay?” 

“Okay.” 

One of Kei’s hands spreads Yamaguchi’s thighs, the other moving to tease at his rim. Yamaguchi whines, his knees trying to close, and Kei nips at his jaw, keeping his legs spread with a firm grip. “Don’t hide yourself. I’m going to be seeing a while lot of you, so there’s no point in being shy.” 

Whimpering, Tadashi nods slowly, and relaxes somewhat as Kei slips two fingers inside of his hole. Kei’s fingers are long and slim, and slip inside easily, slick coating them immediately. He probably didn’t even need to prepare the omega, because he’s reacting so well to Kei’s touch and opening up with little prodding; his little cock sits rock-hard and dripping, untouched, and Kei’s own cock twitches at the sight of the man in front of him. Yamaguchi gasps when Kei’s fingers shift inside of him and Kei grins, dragging his fingers over the same spot. He revels in the way Yamaguchi moans and whines, rolling his hips to get more stimulation. 

“Fuck, Kei...N- Need you, now. Please. Please,” 

Suddenly Kei’s confidence wanes and he hesitates, looking down at Yamaguchi. “I don’t want to hurt you, Tadashi.” 

Yamaguchi groans. “I can take it, Tsukki. Come on, fuck me.” 

“Right. Right, I’m going to fuck you and I’m going to claim you. Got it?” 

“Got it.” 

Kei slides his fingers out of Yamaguchi’s hole, positioning his member and pushing inside. As soon as the tip slips in he groans, pleasure overtaking him as he bottoms out with one quick thrust that brings out a loud cry from the omega underneath him. He growls, connecting their lips once more, as he fucks into Yamaguchi roughly. His hands wander Yamaguchi’s body, the omega reacting to his touch so well, his back arching off the bed. Kei sucks in every little sound, every little tightening around his cock, quickly losing control of himself. 

“Fuck, Tadashi...You’re mine. I’m not going to let anyone touch you ever again, you’re mine and only mine, you understand?” 

Yamaguchi keens, a shiver running down his spine, and nods. His hands, tangled in Kei’s hair, grips tighter with every thrust. 

“If any other alpha even looks at you after this, I’m gonna fucking kill him.” 

“Possessive of me already? You haven’t even- hn, you haven’t even marked me yet.” 

“If you want to rush me, Tadashi, I can gladly make you cum faster, but I quite like this pace more,” Kei growls, thrusting harder, and he hears Yamaguchi’s breath hitch. 

“F- Fuck, please, Kei, faster. Please. ‘m so close, so ready, plea-” Yamaguchi gasps, his eyes rolling to the back of his head, and Kei grins. He nips at Yamaguchi’s neck, right where he’s preparing to mark him, and reaches a hand down to stroke Yamaguchi’s dick. Yamaguchi reacts to the touch with a shout that will more than likely get Kei a noise complaint from his neighbors, but he doesn’t care one bit. Kei’s own orgasm builds closer and closer as he continues fucking into Yamaguchi ruthlessly, and he knows Yamaguchi is close by how much he starts to tighten around his cock. 

“Tadashi...Tadashi, I’m gonna cum. I’m gonna fill you up so good, baby,” He pants, “You’re going to be full of my pups soon enough. I’m going to claim you and get you pregnant as soon as possible, so everyone knows you’re mine. You’re mine, hear that? Mine.” 

“Fuck, Kei..! Please, please, ‘m coming, claim me alpha, ple- agh!” 

Kei wastes no time in biting down on the junction of Yamaguchi’s neck and shoulder, claiming the omega as he comes. As his teeth sink into flesh, Kei’s own orgasm spills inside of Yamaguchi and he thrusts one final time as his knot swells and locks them together. An indescribable pleasure washes over him as he feels the mating bond form between them. Once they’ve both finished, Kei collapses on top of Yamaguchi, both of them panting breathlessly. 

“So, you’re an omega.” Tsukishima said, as he entered Yamaguichi’s room and sat down on his bed.

Yamaguchi was sitting against the corner of his bed, with his knees pulled up to his chest. He honestly didn’t want to talk to anyone right now, not even Tsukishima, and yet, here he was, in his room and aware of Yamaguchi’s embarrassing secret.

Yamaguchi’s body had been reacting negatively toward any heat suppressants he been given, the pills were making him sick. He didn’t want anyone to know he was an omega, he didn’t want other people to think of him as weaker than he already was. Adding omega to the list of weaknesses that followed Yamaguchi around was so detrimental to him.

“Who told you?” Yamaguchi asked, peeking up from his knees.

“Your mom, just now.” Tsukishima sat up against the wall, with his arm touching Yamaguchi’s. Tsukishima caught a pinprick of Yamaguchi’s scent, it was pleasant, and he allowed himself to smile at it.

Yamaguchi sighed, because he really didn’t want other people to know.

“It’s lame, isn’t it?” Tsukishima said, he turned his head and looked Yamaguchi, who wouldn’t look back at him.

“Yeah.”

“And of course, it would happen to you, wouldn’t it?”

“Yeah.” Yamaguchi let out a heavy sigh, “Tsuki, I really don’t want –,”

“You know,” Tsukishima lifted his arm and placed a hand on Yamaguchi’s shoulders, “I was really hopping you’d be an omega.”

Yamaguchi furrowed his eyebrows, he lifted his head and glared at Tsukishima, “Hey, why would you want that?”

“So we could be together.” the words left Tsukishima’s mouth quicker than he was anticipating, but it was true. He really wanted to be with Yamaguchi, and if Yamaguchi was an omega it would make things a little more easier. It was also the perfect excuse to get closer to him.

“Be together?” Yamaguchi repeated.

“Yeah, I mean, I wouldn’t want some other alpha having his way with you.” Tsukishima explained, “But I know I’ll take care of you better than anyone and besides, this way I can help you with your heats and you won’t get sick from suppressants.”

“You’re not just saying that to tease me are you?”