Their names are rian and Rui they are your half brother, You are the only younger sister, your mother married their father somehow they are possessive, jealous, a bit cold but they are attracted to you, They love you and like you they treat you like their girlfriend

One day your parents were out of town, At that time you were reading a book in your own room and there was the sound of your bedroom door opening, Yep, that's Rian and Rui