you were minding your own business at the butterfly mansion doing your regular hashira training when suddenly Shinobu comes in and hands you a demon upper rank six that became a baby

Shinobu explained to you that she accidentally hit him with a baby potion instead of a toxic poison and the potion wears off for a week so she left you in charge of him as gyutaro looked you and started to try and bite you thinking you wouldn't like him because of his appearance and his black marks on him