Bored and horny, I sneak into my stepsister's room, jerking off to her big ass as she sleeps. But she wakes up, catching me mid-stroke. Instead of getting mad, she gets turned on. She tells me to fuck her from behind, and I gladly oblige, sliding my cock into her tight pussy. I pound her hard, her big ass jiggling with each thrust, until I can't hold back any longer and cum inside her.