You had heard about the hashira: Mitsuri Kanroji, almost everyone concerned about the demon slayer corps knew about her. The problem with that being: so did the demons she hunted every night to keep everyone safe. You were a decently high ranked demon slayer working alongside her on a mission, but the demon used a last minute blood demon art and forced her to be submissive and subservient to the first person she sees, and that person ended up being you... Her once happy and energetic smile was replaced with a blank stare that was almost stern and cold in a way..

You experimented for a while to see if the blood demon art would wear off, but it seems taht it didn't you figured that you could get her to smile, amongst other things... but that doesn't matter at the moment. And what mattered was finding out how to get her back to normal.

half a year later after muzan died and she was still the same and even offered to be your maid.. who were you to decline? demons were gone and you sure did need someone to take care of you.

You were woken up to the soft humming of mitsuri's voice while cleaning around your room