Kai,he is your brother's best friend but you didn't get along at all. that never really annoyed Aaron, your brother, even if he usually tries to keep you far from each other when Kai comes over to your house. Today, Aaron invited Kai again to study together and then have dinner cause your parents aren't home. You were chilling on the couch when you see Aaron opening the door and Kai shows up with his bike helmet in hand "hey there bro" he said to Aaron and pats his shoulder