Chapter Text
Beomgyu wonders where it all went wrong.
He stares blankly at the icy blue tile of the bathroom wall. He’s stripped down to just a slightly oversized tshirt with his legs spread open, sitting on the closed lid of the toilet. He tries hard not to think about Soobin’s fingers ‘inspecting’ him, yet quivers as the fingertips graze against his vulva. Then near the rim of his hole. They move frustratingly slow in between his folds as if he’s actually inspecting it. But Beomgyu knows his brother by now, and that growing tent in his pajama pants certainly doesn’t help his case.
“Sorry, Beomgyu-yah. It’s cold, isn’t it?” Soobin feigns innocence so well that it terrifies Beomgyu to no end. “I’m just being thorough.”
It’s hard to not react. To not get wet. He’s been conditioned to feel this way. He tells himself. It’s because his brother is an alpha and he is an omega that he feels this way. It’s the only way he can mitigate the shame that courses through his veins when slick coats his soft cunt. The only way to mentally plug his nose and pretend his scent isn’t permeating within the small bathroom of their shared apartment. It’s the only way he can separate himself from his biology.
Beomgyu can only nod and look a bit pitiable in hopes that his brother will feel some form of sympathy for him in his twisted mind and finish their ‘checkup’ quickly.
“You know it’s for your own good, right?” Soobin repeats the same phrase he always does, like clockwork.
It was a deal they made when Beomgyu first reached the age of eighteen: If Beomgyu wanted to go to university, he had to agree to these daily checkups by Soobin or else he could say goodbye to his only escape away from his family.
It was confusing at first.
When Soobin first brought it up, Beomgyu thought he was sick with some illness he didn’t know about. Why else would his brother need to perform check ups on him? So he asked, naively, not knowing what his brother truly wanted from him.
Soobin told him that it was necessary for omegas to ensure everything was in order, that they are more likely to experience abnormalities and illnesses than other subgenders. That it’s better to catch them early on rather than later. He told him it was also for his research— to understand the omega subgender better.
Ah, I can help out my brother in return, while he helps me! He remembers thinking.
Soobin is his big brother. Soobin is a son following in the footsteps of an infamous doctor. Soobin is his best friend. Beomgyu had no reason to doubt him. Beomgyu has never had a reason to doubt him. For as long as he could remember, Soobin stood beside him, always there for him through thick and thin. Soobin loves him.
He believed it all. He really did. With his whole being.
He believed it until the touches began lingering. He even believed until his body was pressed into the mattress as he took his brother’s knot for the first time at 19, saying it was for Beomgyu’s sake.
He’d be a fool to continue believing after that point. Though he fears the part of him that still trusts that this is all because Soobin loves him.
Beomgyu wishes he would’ve never agreed. But if he hadn’t, where would he be? Would he be stuck as a housewife under a marriage arranged by his parents? Would he have run away and ended up homeless on the street? Or worse, dead ?
At the end of the day, he realizes he really had no choice in the matter. His parents would’ve never listened to him. No matter how much he begged. They barely cared about him when they first took him in. It was all pity: their ‘love’. Eventually, they completely stopped giving a shit about him the moment they found out he was an omega.
His parents are the deeply traditional type. The type that believe that omegas are just meant to be homemakers, meant to cook, clean, and pump out children for their alphas. Beomgyu knew deep down he was meant for more than that. He didn’t just want to become some stay-at-home babymaker for a random alpha assigned to him by his parents. He had to escape and Soobin was his only way out.
So he agreed and like his brother promised, Soobin convinced them. They then both moved out into an apartment in Busan, provided by his lovely parents.
This was the sacrifice he made for his freedom.
He stands up from the toilet once his brother gives him the routine pat on his hip and reaches for his pants neatly folded on the counter. Soobin swipes at them first.
“What do you need those for? You know what day of the week it is, silly.” Soobin chuckles.
Beomgyu tries not to waiver, “Well… I-I was actually going to ask… if we could just not do it tonight. I have an important exam tomorrow. I-I just want to get a good night’s rest.” It’s all an excuse, of course. He pulls at the tshirt to cover himself up a bit more, suddenly feeling exposed as Soobin’s cold gaze lingers on his lithe form.
It always feels as if he could see right through him.
Tomorrow is actually Beomgyu’s date with Kai. They met a few months into Beomgyu’s second year. He remembers it all like it was yesterday. Kai came bustling into the music room, sheets of music in hand, ready to audition. His hair swept perfectly over his sculpted face and god was he pretty.
Beomgyu was immediately enamored by him. He’s seriously like a storybook prince come to life. He’s tall, outrageously handsome, funny, and smart. And the best part? Kai is a beta— someone who’s an escape from all of this alpha-omega societal nonsense. He’s someone that he could hide from his brother. And in his deepest wishes, he’s also hoping Kai would save him from his brother.
He hopes to God that one day, Kai could really save him from all of this.
Soobin pouts. Beomgyu wants to retch. He can’t tell if it’s out of nervousness of asking for such an anomalous thing or the fact that it makes his insides twist when he makes that face .
His brother just starts humming, thinking, as he turns around to put his tools away and discard his gloves.
He just continues humming .
A deep unease sets in Beomgyu. Soobin finally speaks.“You’ve never had a problem with it before an exam. So why now?” He can't read his expression from here.
“This class- it’s just been a lot harder this year. And I-I’ve always been pretty tired after we do it. I just feel especially anxious about this one. That’s all.” He tries again. The longer they sit in silence the more Beomgyu just wants to take it all back. Beomgyu can postpone their date. He can’t say no to his brother. His mind races.
More silence.
Then more humming .
Panic sets in, “You know what? N-no, It’s fine. I changed my mind. We don't have to skip.”
Soobin turns back and smiles. Beomgyu trembles.
Beomgyu wishes it would hurt. He really does. But when his alph- his brother bites him at his nape and releases his deep, woody scent; everything wrong in the world, everything wrong with this, it floats away. It’s out the window.
Beomgyu hates it so much. He hates that he’s made this way. He hates how easily he’s just reduced to an omega. No matter how hard he tries to escape. He is his biology. Everyday he’s reminded of such.
Beomgyu is on his front, elbows propped up as Soobin’s fingers reach deep inside of his cunt. It takes him out of his negative train of thought. He’s opening him up so, so deeply.
Mmph- Ah. He can’t help but moan.
“Does that feel good, Beomgyu-yah?” He whispers. It tickles the back of his neck. His fingers are so long and thick and they just keep hitting that spot . “Does my baby feel good?” The two fingers speed up a bit, punching out moans from the younger. He tells him to let it all out.
“ Fuck, hyung. Please- I think I’m gonna come. Puh-P-“ Beomgyu’s hand futilely reaches behind him to grab Soobin’s wrist to stop him but his hyung continues to finger him to orgasm. The squelching sounds as his palm pushes against Beomgyu’s pussy is as disgustingly shameful as it always is. It makes him want to hide.
Soobin adds a third finger.
“H-Hyungie… please… n-no more. Beommie’s guh-gonna come.” Beomgyu sobs.
“Why do you want me to stop, Beommie ? Don’t you want to come?” He slows down a bit. Beomgyu exhales deeply and releases the tension he had from being near orgasm. His hands loosen up from clutching the sheets.
“I-I don’t want to say it. Please don’t make me say it. You already know… what- what I want.” He already feels humiliated enough, why does his brother have to do this every time?
“Beomgyu-yah, I can’t read your mind.” He says sternly. “If you want something, you have to say it, so your brother can help you.” Soobin removes his fingers and guides his cock over to Beomgyu’s folds, drenched in slick. He doesn’t put it in, of course. He never does, not until Beomgyu begs for it.
Beomgyu whines and tries to move back on Soobin’s dick but he just lets it slide in between his cunt. “Beomgyu-yah.” It’s all he says before he continues just teasing him, sliding his cock just against and never in. The tip teasing his swollen clit.
And so Beomgyu gives in, just like he always does. “Soobinie-hyung, p-please put it in. I need your cock to cum. I-I want to come on your cock. Please-?”
“Please…?” Soobin waits.
“P-Please, alpha.” Soobin immediately enters at the last syllable. A gush of slick pushes out as his brother’s cock enters the deepest parts of him. Fuck . Soobin growls as he settles inside of his baby brother’s sweet little cunt. It makes Beomgyu’s omega want to submit.
Soobin’s cock is so impossibly big. Beomgyu doesn’t know what it’s like to not have it hit his cervix every time, to not feel absolutely split open from the inside on his brother’s dick. Something that makes his omega feel so good yet makes himself feel so awful.
“Beommie, baby, you’re made for me, aren’t you?” Soobin starts fucking into him with a deep, steady rhythm.
“Y-Yuh-yes. Hyung.”
“Say it, say it with your own mouth. Say you were made for my cock. Tell me you love me.”
Beomgyu just whines, unable to find his words when Soobin keeps knocking them out of him.
Suddenly, Soobin stops.
“ Hyeong-” He’s so close.
“Beommie, you love me, don’t you? Tell hyung you love him. My sweet, sweet baby. I love you so much.” Soobin is sounding desperate. He starts moving again but much slower, much deeper . His large hand pushes against the small of Beomgyu’s back, pressing him into the bed.
“My baby. My omega . All mine. I love you.” Soobin babbles on. The angle feels like he’s fucking up all the way into Beomgyu’s stomach. Beomgyu refuses to look but he can feel his monstrous cock bulge against him.
It hurts so good. He feels like he can’t think at this point. “Hyungie. Y-You’re hurting me. I love you-I love you so much, Soobinie-hyung.” Soobin seems to let up a bit at the sound of his name.
“God, Beommie, you’re clenching around my dick so hard. Do you want me to breed you? Is that it? Do you want to have my pups?” Beomgyu whimpers at the thought. To have his alpha’s babies, to be bred. He keens. There’s nothing his omega wants more.
“No, no, not inside. Not today, please, hyung?” Beomgyu begs. He hates when Soobin cums inside of him. He hates that his inner omega radiates with joy once he’s filled to the brim. He’s ashamed with the way his heart soars when the knot catches, stretching his walls, pumping him full of an alpha’s cum. He doesn’t want to be bred. He really doesn’t. No matter how much his omega begs for his brother to breed him. He doesn’t want it.
But fuck, he really needs to cum.
Soobin suddenly stops. Beomgyu mewls. Frustrated, the younger boy tries to move back on his brother’s cock, maneuvering his hips in any way he can. But it’s all in vain. Soobin removes himself completely. Beomgyu can feel his hard cock barely brushing against his pussy as he bends down right beside Beomgyu’s ear.
“Beomgyu-yah,” His voice low, “You either cum on my knot or you don’t cum at all. Do you understand?”
Beomgyu just whimpers into the pillow beneath him. Impatiently, Soobin grabs onto a chunk of his hair and yanks his head backward, eliciting a yelp. “I asked you a question.”
“Yes! Yes, hyung, I understand.” He feels a few tears run down his face, scalp throbbing.
“Now be a good omega and beg your big brother to breed you.” Soobin doesn’t let up on his hair. He doesn’t put his dick back inside either. He just brings his hand down and starts fingering Beomgyu again. Not doing anything but teasing him.
He really can’t take it anymore.
“ Hyung, Soobinie-hyung, alpha, knot me, please. I want to cum on your knot. Breed me. Anything. Please . I need it, fuck. ” He keeps rambling at this point.
Beomgyu doesn’t need to see it because he can practically feel the smug expression on his brother’s face at this point.
Soobin snickers, “That’s right, Beommie. You need it. You need my pups. You need me.” Soobin removes his hand from Beomgyu’s sopping cunt, trails up to his sensitive nipples and gives them a pinch. Beomgyu hisses. Soobin presses back inside, reaching as deep as ever. His hand traces down, landing upon the distended part of his abdomen.
“Do you feel me all the way inside you? Only I could give you this. I’ve ruined you. And I’ll continue to ruin you until you can no longer think of anyone or anything but me .”
“Not your school,” He thrusts with a bruising force.
“Not your friends,”
“Not even that beta boy you think you love.”
Beomgyu’s haze is immediately broken at the last phrase. He tenses.
“W-What boy?”
He clicks his tongue. “Don’t play dumb with me. Did you really think I wouldn’t find out?” His brother starts moving again. He growls above him.
“I-I’m sorry. Please leave him alone. D-Don’t touch him.” Beomgyu feels his world crashing down on him.
“I-I’ll buh-break up with him. I-I’ll never talk to him again.”
“I know you will.” Soobin grips tightly onto his hips, slamming him backwards onto his cock. “And if you don’t? I’ll fuck you. Right in front of him. I’ll show him how much of a cock-hungry whore you are. How you can’t come unless it’s on my knot. I’ll show him who you belong to. Who you’ve always belonged to. ”
“I’m sorry. I’m sorry, hyung.” Beomgyu sobs.
Soobin hums. “I know you are.”
A couple more brute thrusts and Soobin cums, his cock pressed up all the way inside. The knot forms at the base. Beomgyu wails and immediately cums on the knot pressing up against his walls, the warm fluid filling him up.
Beomgyu can't think anymore. His brother always scents him while he knots him. The euphoria clouds his mind completely. He feels himself lose consciousness.