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Masaru dreads hearing Katsuki say Eijirou will be staying over. He dreads knowing the boy will be in their house, their den for more than a day.
It’s not that Masaru disliked Kirishima Eijirou. Frankly, it was quite the opposite.
He enjoyed the presence of his son’s omega boyfriend a little too much.
Eijirou with his bright eyes and soft face and his young omega scent.
There are no other omegas in the household and even though he’s a mated alpha he can’t help but enjoy the way the teen’s pure and sweet omega pheromones linger room to room. It fills the house nicely, makes Mitsuki calmer, Katsuki more relaxed.
But for Masaru it was his condemnation.
Not only was it his scent, but the way Eijirou eagerly accepted praise and attention from him, would bow low in respect and repeat his 'thank you's more often than needed. The way Eijirou looked at him with those big ruby eyes and thick dark lashes, the way his plump lips would stretch into a smile.
He is a boy on the cusp of growing into a man.
An omega ripening to a sex appeal he has no control over.
He wears loose fitted tank tops, his chest visible and tan and too tempting.
(Masaru wants to put his mouth on it.)
He doesn’t wear a collar while visiting. Katsuki had reassured him he doesn’t need one in their house, Mitsuki reiterating his safety. Masaru, of course, agreed, nodding with a smile that didn’t quite reach his eyes.
Eijirou’s unmarked neck was always visible and exposed - and tempting, too tempting, always tempting. Masaru tried his very best not to stare at his nape, tried his hardest not to imagine sinking his teeth in but his fangs ache whenever Eijirou was near.
Masaru almost wanted to believe that Eijirou did it all on purpose. Seducing everyone he interacted with. But he knows the boy is just naive and too stupid to realize that he is a rabbit and Masaru is a starving wolf.
Luckily, his son and wife don’t recognize the way his eyes linger on Eijirou, how they’ll stray to his lips or his exposed skin.
—--
Tonight, Eijirou is sleeping over again, he usually does so during their breaks; it’s nothing new.
But this time, Mitsuki isn’t here, having gone on a work trip to Fukuoka.
Mitsuki has rules for Katsuki though, no sleeping in the same room and no sex. Threatening to ban sleepovers forever if she or Masaru ever catches them.
Masaru thinks his son follows the rule because during the countless nights Eijirou has slept over, placed in the guest bedroom, not once have their scents mingled more than usual.
It's late so he knows Katsuki is probably already asleep, he’s always been an early sleeper anyway. Eijirou, on the other hand, sometimes stays up a little late.
It’s midnight when he looks at the clock and Masaru decides to check on the boys one last time before he heads to bed.
He’s pretty sure the boys are asleep by now - should be asleep by now. But he can hear the TV on in the living room.
So he goes out to check. Just to make sure they're okay and they didn’t leave a mess in the living room.
(not because of the small hope of maybe Eijirou showing him glimpses of tanned thighs splayed out on the couch lazily as he watches a late night drama.)
But, while he makes his way past the bedrooms and to the living room, a scent hits him. It makes his nostrils flare as he tries to inhale more of it in. It’s so sweet and enticing and Masaru can feel his cock filling from just the first inhale alone.
He licks his lips that now suddenly feel much too dry and swallows.
It’s the obvious sweet scent of an omega going into heat.
Eijirou.
Eijirou was in heat.
….
He follows the scent into the living room. Stands in the entrance and just basks in the heavenly unfiltered omega pheromones.
It's a miracle Katsuki hasn't woken up to it yet but perhaps it's the fact the young alpha is still newly presented and his ability to scent has not matured.
Masaru knows he has to do something before the teen’s heat gets out of hand.
Knows he should take Eijirou home.
(Does he have enough self control to take Eijirou home?)
He’s a mated alpha, the temptation of an omega in heat isn’t strong to him. He should be completely in control.
(But this is Eijirou. )
He steps closer, peers over the couch and what he sees makes him swallow again, the saliva thick in his mouth.
Eijirou looks like sin personified. Body tight and smooth and tempting. His sleeping form splayed out on the couch, shirtless with only his boxers on, a sheen of sweat on his skin. Too hot from his heat to keep his sleep clothes on, his shirt and shorts thrown haphazardly on the coffee table.
With only the TV as a light source, Eijirou’s body looks like a gift from the devil himself.
but Masaru knows better. He’s an adult - a parent to a soon-to-be hero.
He steadies himself, ignores the coiling heat in his belly and the way his cock throbs, already thick and hard in his pants.
"Kirishima-kun" he says, stepping forward quietly, not wanting to startle the kid. He's grateful for already being a mated alpha because if he wasn’t he would be on top of the omega already, sinking his cock and teeth into the boy before he could even fully wake.
He stands beside the couch, watching as Eijirou squirms in his sleep, belly side down, face pressed into the pillow as his hips grind down into the cushion below - searching desperately for relief.
Masaru watches with intensity but takes no action. Minutes pass by. Then, finally, Masaru places a hand on Eijirou's shoulder to wake him.
"Kirishima-kun, wake up-" he means to say more but it's caught in his throat when Eijirou lets out a loud moan, his body shifting and then Eijirou is peering up at him in the dark, mouth open, breath coming in heavy pants.
"Katsu- Katsuki…" he whines, and then the omega's hand is coming up to wrap around Masaru's wrist, pulling him closer until Masaru's knees are bumping against the edge of the couch cushions. "Ugh… need you" he whispers and his voice, his sinful fucking voice, goes straight to Masaru's cock.
Pulling his hand back is a mistake, because Eijirou’s hand falls against his hip. It steadies there for a second before drifting lower, the teen dragging his palm across the front of Masaru’s pants, stopping on the bulge of his obvious erection.
Masaru watches as Eijirou stares at his crotch, eyes hazy and unfocused. The boy bites at his lip coyly before he starts to palm at Masaru’s throbbing cock.
"Dude, you’re rock hard…” he giggles, hips stilling as he rubs at Masaru’s cock with a lazy rhythm. "I'm so horny, I think I might be going into heat…" he whines, a pout on his lips.
He’s definitely going into heat, Masaru thinks.
With his red hair down and his face flushed red and his naivety, it's very cute to Masaru.
(In a seductive, devilish, addicting type of way.)
And Masaru wants to absolutely give in.
“C’mon, Katsuki” Eijirou urges, and then he’s leaning up and forward, resting his weight on his elbow and putting his mouth on Masaru’s cock through his sleep pants. The boy’s mouth is hot and wet, Masaru can feel the heat through the thin cloth, can feel Eijirou’s lips mouthing at his girth.
Eijirou curls his fingers around the waistband of Masaru’s pants, a smile on his lips as he pulls it down, his cock springing out, thick and heavy. He’s quick to wrap his hand around his girth, engulfing Masaru’s thick cock in his mouth. Pretty lips stretch around him and Masaru knows he won’t be able to stop himself now. Not after Eijirou tries so hard to concentrate on sucking his cock, lips wrapped tight around the tip as he strokes the remaining length.
He’s not very good at it but the sight and sounds he makes more than makes up for it.
(He wonders if his son is the one who taught Eijirou how.)
The boy looks up at him with his mouth still on his cock and he must be completely out of it because his eyes are glossed over - the heat kicking in - and he’s barely registering the man in front of him. It’s amazing, to see the boy drop into his heat so quickly - not realizing that the scent is a bit off- not quite spicy enough to be Katsuki’s but very similar. Is too far gone to realize that Masaru is taller than Katsuki, his cock thicker, his alpha musk much more mature.
And that thought shouldn’t have turned him on as much as it does. Taking advantage of his son’s boyfriend makes something dark in his chest curdle and expand.
This is definitely rape. It’s rape and Eijirou is a teen, a minor, too far gone into his heat who thinks that the cock he’s sucking belongs to his boyfriend. He’s unclaimed, unmarked, unmated - and his neck uncollared. A dumb omega who doesn’t realize the dangers around him, doesn’t realize anyone could be a threat to his safety. If Masaru were to be caught he’d go to jail, he’d destroy his family along with it, possibly even ruin Katsuki's future career.
His son would never talk to him again, his wife would divorce him.
And for some reason, none of that matters to him at this moment. The only thing he cares about is breeding the omega in front of him.
A beautiful young omega that Masaru knows he can't resist.
A boy Masaru is willing to risk it all for.
A growl leaves his throat as he finally - finally gives in and takes.
( finally hunts the defenseless rabbit)
He reacts, both of his hands grab Eijirou’s head, fingers threading through soft red locks as he tugs the teen back down on his cock. Further and further until the head of his dick is nudging against Eijirou’s throat and the boy is shifting uncomfortably, body seizing as he gags around the intruding shaft.
But Masaru just continues to sink his cock in and out, a groan escaping him as he feels the teen’s throat convulse around him, feels the head of his cock bump the back of Eijirou’s throat over and over again. Eijirou shifts to ease the pressure off his throat, and then, when he knows Eijirou is at his limit- he tugs the boy off him.
Saliva coats Masaru’s dick with thick strands of it trailing down the teen's chin. The boy’s face is red and tears make his eyes glossier in the lowlight, his lips red and swollen and wet.
He’s coughing and gasping in air.
An absolute mess and Masaru’s never seen anything prettier.
“Bro, that was too rough,” Eijirou slurs out between coughs but laughs it off in an almost delirious state. He uses the back of his hand to wipe off the spit on his chin and then, with clumsy movements, lays belly side down. He lifts his hips off the cushions, wiggling his backside as an invitation.
“Come on, hurry up,” he whines.
Masaru doesn’t hesitate. He gets his hands on the boy’s hips and adjusts him, tugs him down the couch instead, moving him so his knees are on the floor and his upper half against the bottom seat cushions.
His fingers press against Eijirou’s hole through his boxers and the boy moans (way too loud, it could wake Katsuki up). Masaru uses his other hand to cover Eijirou’s mouth, muffling his lewd noises as Masaru rubs Eijirou through his underwear, feeling the soaked material drag across his entrance.
Eijirou is begging, muffled pleases through Masaru’s hand and the alpha wishes he could hear it more clearly.
He pulls Eijirou’s boxers down his quivering thighs, exposing his sopping hole. It’s messy with slick and Masaru cant hold in his growl at the sight. He wants to taste it, wants to put his mouth on it, lick him clean until he’s spilling more.
He wants to know what Eijirou tastes like, if he’s as sweet as he smells, as sweet as he sounds, as sweet as he is.
As much as he’d like to spend hours licking up every last drop of slick from Eijirou he doesn’t have enough time. He can't wait any longer.
He sits on his knees behind Eijirou and pulls his boxer's down his thighs, just enough for his sopping entrance to be on display. Gritting his teeth, he lines himself up with his son's boyfriend's hole and starts to feed his cock in slowly, letting Eijirou moan loudly at the sudden feeling of being stretched. He sinks in, inch by slow, agonizing inch, feels Eijirou gush around him and he whines loudly as his body shakes through an orgasm.
Desperately, the boy rides his orgasm out, rocking back onto Masaru’s cock, wet heat clamping tight around it.
Masaru stays still, watching Eijirou work his aching cock.
“Feels good, so good, fuck, dude, please fuck me” he moans.
The older alpha starts to rock into him, dragging his cock slowly in and out, wrapping his hand around Eijirou’s mouth again to keep him quiet.
(because he’s much too loud and Masaru would hate to have his son wake up to see his father fucking his boyfriend raw on their family couch).
But it’s so tight around his cock, Eijirou’s insides grip desperately around him. Masaru can’t continue the slow pace, can’t resist slamming his hips into the omega. Cant stop the lewd sound of skin against skin and the boy gasping with each harsh thrust. Again and again and again. There’s slick pouring around his cock now, wet sounds filling the room, the scent of sex and heat and sweet omega fills the air.
He’s bigger than Katsuki, he knows it, especially with the way Eijirou is whining on his cock, his voice getting louder the deeper Masaru goes, his body shaking.
“Oh fuuuuck-” the boy moans and Masaru picks up his pace.
Eijirou likes it, his hips rocking back with each of Masaru’s thrusts. It’s wet and sloppy and Masaru knows the rug beneath them will be damp when they’re through. The omega is noisy, moaning and whining, and it’s beautiful - sounds straight from a porno and Masaru wishes he could record it. Regrets not doing so.
A low keen leaves the omega’s throat, and Masaru groans. He knows he wont last much longer, the tight squeeze of Eijirou’s tight body is too good. The thought of him stuffed full of his cum too tempting to resist.
He can hear Eijirou begging, it’s muffled and quiet but it comes out like a mantra, “-please, please alpha, feels good, inside, come inside, please-”
Masaru yanks Eijirou back onto his cock, nails digging into the omega’s hips as he feels his climax approaching. He doesn’t last long, not when he’s got the lewdest fantasy he’s always dreamed about tight on his cock.
Groaning loudly, Masaru rolls his hips, pressing against Eijirou and tugging the boy’s hips back until he feels his knot sink past the too tight entrance. Eijirou whines loudly, back arching, legs quivering as he cums from the sensation. Just from the feeling of Masaru’s knot inside him.
Masaru has to wonder if this is the boy’s first knot, if this is the first time he’s spent his heat with anyone.
The dark coiling feeling inside him preens at the idea of taking his firsts.
The boy slackens in his grip and Masaru is shocked to see that he’s unconscious. It’s amusing- and endearing- and Masaru wonders how often he passes out during sex. But he also thanks the gods for it because he doesn’t have to worry about Eijirou realizing that it was the wrong Bakugou currently knot deep inside him.
Masaru stays there, taking in the view and listening to the boy’s breathing until his knot deflates enough to slip out of Eijirou. The amount of cum that seeps out of his fucked out hole is impressive - even to Masaru.
He hasn’t cum that much in ages.
Trying his best not to wake the teen, he eases the boy’s soaked boxers back up his hips and lifts him back up on the couch.
He’s still fast asleep.
.....
It doesn’t fully hit him what he had done until he leaves the living room and is back in his and Mitsuki's bedroom. His heart is racing, and even the afterglow of sex can’t keep him from the worry that seeps under his skin.
…
...
"I'm sorry, okay?!" Katsuki yells at him with unshed tears in his eyes.
“Katsuki!” he raises his voice, faking anger and disappointment . “Your mother will be furious when she finds out…you should’ve had better control of yourself” he scolds him.
And his son - his poor, oblivious child - looks like he’s going to cry.
“Damn it, I know that! Fuck…” Katsuki yells, trying to defend himself but the look on his face tells all.
Eijirou had woken up and cried to Katsuki, explaining what had happened last night and Katsuki truly thought he had lost control of himself, his alpha instincts taking over, causing him to remember nothing and irresponsibly knotting Eijirou without protection. Katsuki had to wake Masaru up, begging him to take Eijirou back home so he can spend the rest of his heat in safety. Of course, Masaru - being a mated alpha - could handle Eijirou's sweet heat scent while he drove him all the way home. The omega had thanked him with the deepest bow Masaru has seen from him. A blush high on his cheeks and his eyes downturned in embarrassment as he apologized. Masaru had offered a gentle smile as he watched the teen walk back to the safety of his parents.
“Well, we can’t do anything about it now...” Masaru sighs.
“Ugh! Shut up!” his son yells, face red. “...I know I fucked up.” he whispers, looking away, shame and guilt and despair draping over his features.
Masaru turns away, feigning disappointment as he shakes his head, phone in hand as he prepares to call his wife and burden her with the bad news.
….
Eijirou doesn’t come around for several weeks after that.
Katsuki’s mood is different. He’s ashamed of himself for his lack of control, frustrated that he got them in a situation like that. Masaru knows his son - knows he blames himself for it all.
A couple months after the incident, Eijirou and Katsuki talk to him and Mitsuki. They tell them Eijirou is pregnant. That the omega decided to keep it and he will take full responsibility for it.
Mitsuki talks to Masaru privately, convincing him that it was an honest mistake and they should see it as a blessing.
It would be their grandchild, they should be happy.
(His alpha preens at the thought of the omega pregnant with his child, his son's sibling.)
They offer their home as a place to stay, to raise the child together with Katsuki.
Eijirou ends up accepting the offer with a lot of convincing from the Bakugous. Their house is much bigger than Eijirou’s family’s apartment. They already have an extra guest room Eijirou could use. And Katsuki’s parents will be there to help take care of the child.
He moves in with them a few weeks later.
….
It’s endearing and addicting to see Eijirou grow, his belly round and body softening. Masaru is always volunteering to help, luckily he works from home.
He takes Eijirou to his doctor appointments, the grocery store, the mall, to his family’s home for visits. He cooks for him, cleans for him, massages his shoulders and back and feet.
Preening and basking in the perfect, domestic life he's created for his omega.
At first, Eijirou was against Masaru helping him so much. He was always apologizing and politely declining offers. But eventually he got used to it, appreciates it. His omega instinctually feeling at ease and comforted with the alpha around.
(He doesn't realize it's because his omega recognizes Masaru as the father of his pup.)
…
When the baby is born, he has ruby, red eyes and brown hair. They say it's a recessive gene of course.
But Masaru knows better.
….
Katsuki is still in class while Eijirou has opted for homeschooling to better take care of their child.
Masaru is in the kitchen, washing dishes when Eijirou comes up behind him. Eating cut apples dipped in caramel that was prepared by the alpha himself.
"Mr. Bakugou, I'm going to have my heat again soon."
Masaru falters in the middle of washing the dishes but continues, gulping at the thought.
"We can make arrangements for a heat room for you." He reassures the omega.
"Dude, I dont want a heat room."
"Huh?"
Eijirou pouts, leaning against the counter next to Masaru, tilting his head so it's in view of the alpha's. "I want you to knot me again."
Masaru stops what he's doing and turns towards him. Staring at Eijirou. The beautiful, gorgeous omega who has filled out in all the right places, staring at him with those bright, ruby colored eyes.
“I’m sorry, I think I misheard you. What did you say?” Masaru offers a kind smile but his stomach feels like it’s about to collapse in on itself.
Eijirou grins, his sharp teeth on display, sultry eyes looking up at him through dark lashes. “I said…I want you to knot me again.”
Masaru can’t answer, doesn’t know what to say, can’t say anything. His heart is racing and he can’t believe what he just heard right now.
Eijirou steps up to him, hand skimming across Masaru’s chest and then drifts downwards, over his abdomen and towards the waistband of his pants. His fingers dance at the top before trailing lower, brushing against Masaru’s clothed groin.
“Give me another baby, please.” he purrs, his omega scent thick with want and desire and it clouds Masaru’s thoughts, his cock filling as he inhales the rich scent.
Masaru pounces.