Overwhelmed by stepsister's revealing outfits, we indulge in intense and satisfying encounter

My stepsis loves flaunting her cartoon thong and tight skirt, teasing me at the gym. When we\'re alone, her big ass is irresistible. I\'ve fantasized about her, but never acted on it. Yet, when she surprises me, our desire overcomes all boundaries. We engage in rough, hard sex, culminating in a satisfying climax.