||Changed Me|| Demon slayer: Muichiro Tokito x reader (on break)

Ummm... well... the now (Y/N) (L/N) the youngest adoptive sister of the Kocho sisters After a mission the sisters came in path with a lab that looked like it was abandoned about a month ago. They went inside and explored the place and found a little girl that looked like the age of 10 chained to a bed. She was alive...