Mari (Aoi), unable to suppress her bodily aches due to the estrangement from her husband at night, resorted to masturbation to comfort herself and had become addicted to it, feeling restless if she didn't do it in the morning and evening... One day, when Mari woke up and tried to go to the toilet, her son (Satoshi) came out holding his crotch. Suspicious, Mari made him drop his pants and saw that her son's crotch was erect from morning wood, so hard he couldn't urinate... Mari relieved her son of the built-up 'toxins' from not being able to ejaculate, and afterward, she couldn't forget her son's erection. The next morning, she went to her son's room...
