My shy stepsister walks in on me pleasuring myself and can't help but stare at my throbbing cock. She's never seen one before, and her curiosity turns into desire. She timidly asks if she can join, and I enthusiastically agree. We strip down, and I watch her big tits bounce as she rides me reverse cowgirl, her tight Latina pussy squeezing my dick. She squirts all over me, and I can't hold back, pulling out to cum on her big ass.