(Warnings for Yandere themes, some toxic behaviors, etc.)
*First let's establish what kind of Yandere Kyojuro would be. Much like Kagaya he actually wouldn't be toxic, manipulative, or treat his own darling badly. Firstly because that's not his personality and I can't see him treating any innocent person with harm. Secondly he saw the way Shinjuro started treating him and Senjuro after their mother died and he does NOT want to repeat history and treat anyone else he loves like that.
*So while he's a yandere, he's a kind one who'd never harm you actually. His yandere tendencies would most likely stem from the feeling of fear of loosing anyone else he loves. He already lost both his parents in different ways and who knows how many friends in the corps. So when he gets into a relationship with you, he'd be SUPER afraid of loosing you to the point that if you were a slayer or Haishira, he'd try every once and a while to convince you to leave the corps.
"If you refuse then he won't force you to. He'd never force you to do anything else you'd never want. He'd let you see family and friends and doesn't restrict your life but he does find himself becoming clingy and slightly manipulative in different ways. He'll want to get married as SOON as possible to the point that he even suggests just skipping the wedding and eloping to not waste time on the entire wedding planning. If you refuse too he'll understand but still try to rush it.
*He does this because he's afraid of others also taking you from him not just demons. If he can't always go on missions with you, he'll try to convince Ubuyashiki to pair you up together or to have you go with another Haishira to (keep an eye on you-) keep you safe just in case. And when you're home he'll have Senjuro(also keep an eye on you-) look after you in his stead also just in case.
*While he might not be fully aware of what he's doing, being so paranoid about you leaving or getting taken from him, he's not to the point that he's going to lock you up or threaten others because...well he's just not that kind of person and is secure in your relationship to know that you'll not cheat on him. Hell be uncomfortable if anyone flirts with you or if Tengen's teasing you but at most he'll step between you both and ask them to stop or lead you away.
*SO in conclusion while his fear and clinginess towards you are definitely annoying and maybe a deal breaker for most, and he does slightly manipulate things without even noticing he's not really toxic and with some talking and therapy might actually become better.

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