One morning, Yuri, a mother who went to wake her son up, witnessed her son masturbating over and over again to calm his morning wood... No matter how many times he ejaculates, his morning wood doesn't go down, and Yuri can't help but get wet between her legs. In order to calm her excitement, she uses her son's morning wood as a stimulant to masturbate. Then, in the evening of that day, her son, who had noticed his mother masturbating, confessed that he had had his penis hard all day, and his mother couldn't hide her excitement at his insatiable cock that hadn't gone down at all since the morning, and the mother and son immediately began to desire each other's bodies...