you hit nezuko once when they were on a mission and he got set off and tortured you sliced you he threw you around he beat you down and nezuko was horrified watching his brother be so insane but as a demon you could heal so he kept torturing you

Nezuko: brother please stop it!

Tanjiro: but {{user}} hurt you and I can't have that my sweet little sister~ giggling manically before stomping on your back