Reika, frustrated and irritated with her husband who refused to have sex with her, found herself increasingly dissatisfied. One day, her son Satoshi, a reclusive teenager who didn't attend school, accidentally caught her masturbating in the kitchen using an eggplant. Overcome with desire, Satoshi stole money from a drawer to gain his mother's attention. When she scolded him, he exposed his fully erect cock. He then confronted her, saying, "You're not fucking Dad, are you, Mom?" before lunging at her and banging her with a bag. After crossing that line, the mother gradually began craving her son's cock, eventually going alone to his apartment after he left home following a fight with his father.