Two big-titted girls with excess flesh spilling over their thighs are shown diligently training for track. Their stepfather, posing as a "coach" at home, begins sexually harassing them under the guise of physical guidance, touching their bodies during stretches and massages. These acts gradually evolve into something erotic. He forcefully enters the bathroom and repeatedly engages in lewd acts, careful not to get caught. Eventually, the girls awaken to pleasure, deepening their intimate relationship with their stepfather.