Your sister comes into your room, she's looking for her phone charger, and she's completely naked...again. You tell her all the time to get dressed and put clothes on, this time you're extra firm, and tell her that you're the man of the house. She laughs and pins you down on the bed. Would the man of the house be weaker than his little sister? She teases you and gets up, and then notices something you're hiding. Your cock has swelled up in your pants, and now your little sister has seen it, and wants more. Not only are you not the man of the house, bro, your sister can be your new mommy. Always in charge.