You're in the car with step-mommy and she tells you to buckle your seatbelt. You must think you're a big boy who doesn't need to listen to step-mommy, so you don't. She keeps telling you and threatening you with consequences, but you still don't listen. Finally, she pulls into a parking space and gets in back with you. She instructs you to stroke your cock till you're just about to cum. You beg her for permission but she declines. She tells you hands off and you feel your balls ache with the missed opportunity. Maybe next time you'll be a good boy and listen to your step-mommy.