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If that's the case, can I request a one shot of an Platonic Yandere Muzan with Tanjiro and Nezuko?
Yes! I actually have a bunch of ideas for Demon Slayer Platonic Yandere Fics. (___)= what type of yandere, the Yandere character will enforce.
Blind AU: Where Yandere!Sanemi succeeds in blinding Genya and takes him out of the corps to forcibly care for him.(Both Sibling and Parental)
Tokitou Twins Live AU: Where Yandere!Yuichiro survives and becomes a Hashira. No one knows of his little brother Muichiro, who he keeps locked away in his estate chained to the ground for his own safety. (Sibling)
"Rebirth" AU: Yandere!Kokushibo kidnaps Tanjiro after seeing his resemblance to his dead brother Yorichii. He believes him to be his reincarnation and takes him away to become demons together. (Sibling)
Descendants AU: Yandere!Kokushibo kidnaps Muichiro after discovering their relation. He sees bits of Yorichii in the boy and wants to turn him into a demon. (Parental)
Yandere!Douma and Inosuke. Inosuke is the last piece of Kotaha he has left, she was the only human Douma ever regretted killing. He wants to keep him after discovering he has survived all those years ago. (Parental! Though he sees Inosuke more as an interesting pet at first.)
Yandere!Gyutaro and Tanjiro. Gyutaro manages to kill Tengen and Nezuko while Zenitzu and Inosuke are killed by Daki. Gyutaro taking a liking to Tanjiro for his "cowardly behavior" takes him to Muzan to be made into a demon. Muzan believes Tanjiro to be a descendent of Yorichii and makes him a demon to tarnish his legacy. Muzan allows him to keep his new little brother as long as he gets to watch his fall. (Sibling)
I also have some that aren't quite as fleshed out but have potential
Yandere!Sabito and Giyuu. (Some sort of brotherly bond)
Yandere!Gyutaro and Daki. (Sibling bond)
Yandere!Tengen and Zenitzu. (Parental)
Yandere!Rui and Tanjiro + Nezuko. (Sibling bond)