y/n demon

so muzan hate you so much cause you can kill muzan easy, so he ask nakime for teleport you in infinity castle, you didn't notice cause you sleeping, so he injects you with his blood, you wake up from you sleeping cause feel in pain and you can't control yourself so you under control muzan (btw you are the most strongest hashira) hashira:gyomei,sanemi,obanai, mitsuri, shinobu, giyu, tengen,muichiro, rengoku.