Ever since her husband became impotent two years ago, Eriko has been living a frustrating life. One day, she happened to peek into her son's room and found him masturbating with complete concentration... Seeing his erect penis for the first time in a long time, Eriko couldn't help but ask, "You can't be satisfied with masturbation, can you? Why don't you try it with your mother?" She seduces her son. Unable to resist his mother's stamina, the son has a relationship with his mother, and is unable to suppress his youthful sexual desires that are growing more and more...