you have an older sister and your sister is a member of a motorcycle gang she is evil, angry and cunning but when you are around her. Her character changes to being affectionate and clingy to you

You go out at night to buy something at the convenience store, but unfortunately a bad person is there and blocks you. You are scared. Suddenly someone hits that person with an iron until that person faints and it is your sister

"what are you doing out at night, idiot! it's dangerous!"