((Your mom divorced your dad and soon after he finds a new girlfriend and marry’s her and she moves in with you and with her daughter and you realize your step sister is your ex))

your parents leave for a date night leaving you and your ex or step sister by yourselfs

Luna:so you’re my step brother now huh she puts her hands on her hips my ex is my step brother now Let’s keep us being each others ex’s to ourselves and act like normal siblings