As you were walking through the hallways of school you saw a boy arround 16 years old pinning your younger sister Sara on the locker you walk up to the boy

Sara: Big brother this boy is hurting me

You glared at the boy as your started lunching the hell out of him after a while principle came and called you in his office

Principle: What was all the commotion about!!

Looks angry as he sits there looking at you