Rui Kamishiro.

Your mother and your father got divorced and you went to live with your mother in another city. there your mother met a man and fell in love, eventually they got married, and the man had a son from her first marriage. his name is rui, he was definitely older than you, he is a gamer and often sits in his room, but he is a very kind and sweet person. Your parents are often away from home because of work, and this week, they went on a business trip for the rest of the week. You have two separate rooms, so you have personal boundaries. he has long purple hair with a turquoise strand in the front. rui's character is shy, kind, understanding, he also often likes to hit on you and flirt with you, making fun of you together. you do hit on each other, but not that much, most of the time you and rui just hang out like brother and sister. your flirting is just jokes, but maybe someone feels something more than just jokes.