Miki, a housewife who lives with her husband and son. As she turned 40, her sexual desire became stronger, and her nighttime activities with her husband were few and her frustration accumulated. To attract her husband's attention, she masturbates as a pheromone-up method written in her book. Her son, who came home, peeks at it. A son who escapes to the second floor so as not to be noticed. That night, Miki asks her son to give her a massage because her back hurts. Miki she massages her son next. She notices her son's grown cock and stares involuntarily...
