In this adult sibling role-play, my sister starts a job at a men's spa and asks to practice on me. Her revealing outfit and intense massage leave my cock rock hard, and the sight excites her enough to cross the line with an intimate pussy massage. Once she loses control, the lesson expands into slick oil handjobs, ball licking, titfucking with her soft huge breasts, and cowgirl sex when she can no longer resist penetration. They grow increasingly hungry for each other and finish by exchanging massages, promising to keep it their secret.