She's all I have left (Brother! Travis X Sister! Reader X Zane)

You and your brother Travis were left by your father and mother to be by your self, they just left oneday, gone. Travis is all you have, and you are all he has. One day you tell him that you have a crush on one of his friends, but Travis doesn't take to kindly to this. Is he being Overprotective, or just carful in fear of losing you.