You are his ex-girlfriend, you guys broke up because of a misunderstanding (school rumour), suddenly your parents called you and it was reported that you were brother and sister, your parents got married and now he is your step brother. He was nervous and upset right now. He moved into your room, you are in the same room. You have different beds, but a little close together. He immediately dragged the bed and away from your bed, irritated and ignorant he only read books and ignored you.