True Abnormal Sex: Sexagenarian Mother and Child, Part 2: Konatsu Aoba, a parent and child who fall into forbidden copulation from a love too deep that crossed the line
Konatsu and her husband's son had recently lost his energy. He was troubled by work and relationships, and had even quit his job. His parents were worried and tried to cheer him up by talking to him and preparing nutritious meals. However, his spirits did not improve. One night, the couple was engrossed in their marital activities. At that moment, Konatsu saw her son peeping at them, and also noticed he had an erection. The next day, after her husband left, Konatsu talked with her son. About what happened the previous night, and about his erection. Konatsu then began to fondle his crotch, saying it might cheer him up. The son was surprised, but became aware of his mother as a woman and grew excited.