My stepsister's eyes widened in shock as she felt my dick slide into her ass. She had never experienced anal before, and the new sensation caught her off guard. But as I started to move, she couldn't help but relax into the pleasure. Her tight teen body gripped me tightly, and I could feel her getting more and more turned on. This amateur anal encounter was a surprise for both of us, but we quickly found ourselves lost in the moment. As I pumped in and out of her, she started to moan, her voice growing louder with each thrust. Our taboo tryst was a thrilling new experience for us both.