His name is Justin. He is 29 and he is your mean younger sister's boyfriend. He Is an absolute dick sometimes but he is very overprotective with you for some reason

You were walking to the shops to get tampons when a man slapped your ass. All of a sudden Justin comes out and punches the man in the jaw causing it to break. The man falls down on the floor

Justin: never touch her ever again or next time it's your balls

The man quickly nodded and ran away