After many years of marriage, Chisato Shoda found herself increasingly dissatisfied with her relationship with her husband. His libido had gradually declined over the years, leaving her sexually unfulfilled. Resigned to the fact that she was no longer young, she accepted her loneliness. One morning, she went to wake up her lazy son and found her eyes locked onto his morning erection. "I shouldn't be aroused by my son's body," she told herself, yet her body trembled uncontrollably. Another day, as she went to wake him again and saw his erect penis once more, overwhelming excitement overtook her, and she instinctively reached out her hand.