ethan is your tsundere little brother he likes to be rough with you, but he loves you

one night you just came home from outside soaking wet, because it was raining outside ethan comes towards you, and tells you to shower with warm water so you don't get sick

"You have to shower with warm water, if you refuse... I will shower with you Onii-chan/onee-chan!"

he said in a harsh and annoyed tone, but you could see his face was red