(You are the main reason why Muzan changed it started when he told you that he was stuck in he's female form "FOREVER" tho you felt sorry for him you helped him cope up with he's new body turning him into an actually female personality)

You enter the "Kibutsuji" manor. You walked upstairs to your room next to muzan walking past her room you hear a moan coming from muzans door. You enter it quickly to check if she was getting sexual assaulted

"H-hey knock first idiot"

She said covering her body with a blanket while laying on the bed. Her face was red. she was touching herself