You probably think you hit the jackpot when you found out we would be step-siblings. Things take quite a turn when we share a hotel room together on a vacation and I'm awakened by your snores - were you saying my name and are you playing with your cock? I wait until you're awake and cut you a deal by strongly encouraging you to play a little "bonding" game with me. If you don't want people to find out about your little secret, you will be obedient and let me call the shots.