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Eijirou knows he shouldn’t be doing this. He is well aware that this is probably somewhere on the scale of “unmanly”.
But it’s not like Katsuki minds!
…or at least, Eijirou assumes he doesn’t mind. He doesn't actually know. He’s never asked the omega.
What he does know is that sometimes, late at night, his dick wakes him up, dripping and needy. And Katsuki is soft and warm lying next to him, curled into a ball so Eijirou can hunch around him. He looks so peaceful like that. Almost innocent.
An omega, ripe for the plundering.
And, oh, does Eijirou plunder.
It had been an accident the first time, he swears! They had spent a few hours cooped up in Eijriou’s room. At first, it had been to study, something Eijirou still needed help with, but it slowly had turned into just relaxing, talking about anything and everything. Favorite movies and childhood toys, and Katsuki had laughed himself silly over Eijirou’s description of when he first got his quirk.
It was nice.
Even more so when Katsuki had agreed to stay the night, nearly falling asleep in Eijirou’s den already. It had been so easy for the Alpha to make room for himself behind the Omega, to make room on his bed for the Omega to find his place so they could cuddle together. Katsuki fit perfectly against Eijirou.
Eijirou already knew they were meant to be, but this sealed it for him.
They had fallen asleep and…with the scent of Katsuki thick in his nose and the warmth of the omega next to him, it should have been obvious that Eijirou was going to wake up to a hard cock, rutting against his friend’s soft stomach.
Eijirou had been too sleepy at the time to really stop himself and had popped his knot by accident, cumming all over that soft skin.
It was only when he had one hand on his knot to keep it fat and full while the other one aimed to cover his friend, that he fully woke up.
Eijirou had been embarrassed of course! He hasn’t accidentally popped a knot since he was a pup and he certainly has never cum on someone in his sleep.
But then he looked at Katsuki, still sleeping, nose slightly twitching as Alpha pheromones increased. One hand had been reaching for Eijirou, and then he had rolled on his back and spread his legs.
And that’s when the smell of slick had hit Eijirou. And it has been over since then.
~
Eijirou always has to give himself a little prep talk before he starts. Afterall, this is totally fine and Katsuki for sure would love to do this if he were awake. They’re going to be mates, Eijirou already knows this. They’re heading that way and have already sort of started courting.
Eijirou is just marking his territory.
Of course, his Alpha has to chime in too. About how this is all natural. Omegas have fat cunts for Alphas to knot, for them to get their dicks wet. It would be a waste for his seed to go anywhere but inside his Omega. And since Recovery Girl makes sure none of the students can get pregnant, it allows him to freely imagine breeding his Omega without any consequences.
Once that’s done, once his Alpha is demanding he fuck now , Eijirou gets to work.
He turns Katsuki onto his back, taking just a moment to admire how pretty the Omega is. His face is completely smoothed out, not a hint of a frown anywhere. It’s the only time Katsuki seems to be at peace. It makes Eijirou happy.
His Omega. Warm and content in his bed.
Eijirou’s Alpha purrs. Then he gets rid of Katsuki’s sleep pants and underwear.
There’s this really fascinating bit about Katsuki Bakugou that Eijirou is pretty sure only he knows. Katsuki doesn't have a phone or clock to wake him up. He only relies on his internal alarm. It's scary accurate and Eijirou had let out a (manly) shriek more than once as Katsuki sits straight up in bed, exactly at 5am.
But between the time he goes to sleep and the time he wakes up, he is dead to the world. And when Eijirou sticks his underwear under that cute, scrunched up nose, has his Omega take in the scent of him as close to the source as Eijioru can get him without just sticking his cock on his face, then it all but guarantees that Eijirou can do whatever he wants without worry of Katsuki waking up.
And the Alpha does a lot .
There are nights when he is just so hungry , ravenous to devour the soft pink flesh of Katsuki’s cunt. He eats Katsuki out till his stomach is full of slick and Katsuki is withering in overstimulation, sleepily trying to peel Eijirou off.
There are nights when Eijirou feels like pampering the Omega. He'll slowly finger Katsuki open, two of his fingers more than enough for such a tight pussy. He'll do that for an orgasm and two, before sinking his cock in nice and slow.
Those are the romantic nights, when all Eijirou thinks about are weddings and honeymoons and making love by the moonlight. When he barely rocks, just grinds his cock inside and lets his Omega get used to him, to milk him at a leisure pace.
As opposed to the nights when Eijirou goes to bed annoyed at Katsuki for something the Omega said or did during the day. Those are the nights he only gives that greedy cunt the tip of his cock, using his hand to get himself off. He'll come inside his Omega, but he won't give him his knot, allowing Katsuki to whimper and whine about things he doesn't even know he needs.
There are experimental nights too. Nights after he watched one too many videos describing all the things you can do to your Omega. When he pinches that chubby clit, fingers the slit of Katsuki’s small dick, squeeze his balls a little too hard, fuck his tits and finger his ass.
He's even thinking about bringing in toys the next time he gets in a mood to figure out both Katsuki’s kinks and his.
And then...there are nights like tonight. When Eijirou’s Alpha screams " breed, breed, breed " at him. When all Eijirou does is some light fingering, getting his Omega just wet enough before he slips his dick in.
These kinds of nights are all about the knotting, of getting pups into that small belly, of those silky walls clinging to him, begging him to stay buried inside.
His knot slaps against fat folds, the sound wet and sloppy. It takes some bullying, takes him having to force himself inside. That cunt is tight, welcoming his knot inch by inch.
Finally, it pops, and Eijirou has to bite the pillow next to Katsuki’s neck to stop himself from howling.
Slowly, he relaxes onto Katsuki, nuzzling against his scent glands, as his balls pulse, filling his Omega up with his potent cum. Making him all creamy, his red folds look so good covered in white.
He looks down slightly, just to see the way his belly swells slightly.
His Alpha purrs in delight. Someday, that will be his pups in there.
Someday, he’ll be able to fuck his Omega when the other is awake.