Seduced by his mother's voluptuous ass, the son finds himself unable to control his desire, fantasizing about her every night. On days when his father is away, he secretly masturbates, taking advantage of her careless sleeping position that exposes her curves. During the weekend, his father returns from his solo work assignment, and the married couple spends the night together intimately. Watching them quietly, the son's heart burns with uncontrollable passion. One day, his mother decides to start exercising, worried about her figure. As the son passes by, he becomes entranced by her shapely, supple ass—and finally gives in completely to his forbidden desire. "Mom," he pleads, "don't make your ass any smaller..."