A/N: for @nunezs-stuff who requested this! I sincerely hope that I’ve done your request justice, and apologies for the delay. There might a few mistakes since this is my first time writing yandere. And I also sort of may not have met your OC’s personality quirks, but hey, I tried. Hope you enjoy!
Warnings: probs super Cringe cus it’s my first writing yandere, definitely ooc Genya (ngl he sounds like Bakugou 😭), possessiveness, kidnapping, yandere behavior, different forms manipulation, mentions of being locked inside a house, chained, etc etc, you know the gist.
When he first meets you at the selection exams, Genya finds you insignificant, another hopeful face in a sea of others- an obstacle in his path.
Then that indifference to your existence turns into annoyance because you’re like a mosquito he can’t crush, constantly on his heels and by his side, chattering on and on about one whimsical thing or the other, and although he’s made it sure that you know he “doesn’t want your stupid friendship goddamnit!” you just smile gently in response, undeterred by his anger.
Still, for some reason, you stick by his side through thick and thin despite his insults and his unwarranted anger and his rough edges, and slowly, the annoyance turns into expectation.
As slow as it is, Genya begins to expect your constant presence by his side, he begins to expect the shape of your mouth curving into a smile just for him, and he, begrudgingly, begins to accept it.
Then the acceptance begins to swell into something more, something like attachment and something else he can’t yet discern.
You begin to make him feel… different.
You with that soft voice and meek eyes, you with that gentle touch and saccharine sweet smile that makes his heart wrench for someone reason, and the first thing Genya wonders is, is he sick?
The answer is yes, yes he is. Lovesick for you, that is.
Genya doesn’t accept it, at first, doesn’t want to ruin what he already has with you, but he knows that these feelings won’t go away either.
So he shows his love for you in subtle ways.
Whenever Genya sees something you’d deem cute, you’d find it by your bedside table by the next morning, and you know it’s him, judging by the furious red dusting his cheeks and ears when you next see him, and you wisely decide not to poke him about it, so instead you just grin, brighter than before.
He’ll share his food with you if he knows you skipped a meal, and whenever you’re feeling down, he’ll try his best to cheer you up, so “quit sulkin` around!”
And although he looks disinterested to any outsiders, Genya makes sure to hang onto your every word as you talk, even though it’s probably about cute, pink things you like or some other airy topic he probably won’t understand much.
And then the lovesickness bleeds into something unhealthily darker.
Genya genuinely believes you’re not something he deserves, but he’s selfish, and he wants to keep you for himself, because he knows good things in his life are fickle, and never last long.
So when he sees you chatting with Tanjiro, with that same soft, tender smile that’s meant only for him, Genya decides that while he’s not worthy of you, nobody really is.
Nobody but him are allowed to see you. To touch you. Nobody but him are allowed to see the way you smile, or hear the sound of your laughter.
You are his, and his alone, so he wards off anyone else who wants to talk you, all bared teeth and jagged scars and growling voice.
See, since it’s not an if when you’ll get into fights about his possessiveness, and rather a when, he’ll weasel his way out of it by manipulating you in whatever way he can.
He will lie, guilt-trip, gaslight you and victimize himself, and since Genya is quite insecure- in himself, in your relationship, half of it is not even a lie.
He’ll also probably use his guilt about the whole Sanemi incident to convince you be with him.
And that’s not even the worst of it.
Since you’re both demon slayers, and your soft-spoken demeanor makes him think you’re a little bit weaker than the average slayer, he’ll try to get you to quit.
And when that doesn’t work, and you get injured in a mission, Genya takes it upon himself to, in his mind, protect you.
(He knows you won’t willingly quit the corps so he’ll knock you out if he has to, and keeps you in a house he’s made his own, just for this reason only.)
You’re granted the freedom to do whatever you want to inside the house.
Since he doesn’t have any estates like the Hashiras, he will take you outside with him by his side so you won’t be able to escape, his hand resting on your lower back or on your arm, a reminder that you’ll never be able to escape, not with him around.
And, well, if he finds anyone else trying to help you escape…
He’ll make sure they’re not around to help you out a second time.
Overall, you have no chance to escape, because he’s barred the windows, made sure to lock all the doors in locks strong and heavy enough for you to not be able to break.
Hell, he’s even chained you inside your room, just for an extra measure.
This is all to ensure that, you’ll be by Genya’s side forever.
“I love you, I love you, I love you, goddamnit! Why can’t you understand that?! This is all for you. This is all for you, so why are you looking at me like that?!”
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