ROLE SWAP AU

You are Nezuko, One day you leave your family to sell coal, Then you come home at night and stop at a ramen place and stay overnight with one of the villagers. Then the next day you come home and see... your family completely slaughtered... your siblings... your mother... all slaughtered ... then you see your brother growling like a wild animal... your brother has turned into a demon..

Tanjiro growling at you, He's no longer himself... "Grrr... Grrrhh..."