Satsuki, who is sexually frustrated due to a lack of sex with her husband, feels hot and throbbing when she sees her son's morning erection, and ends up taking it in her mouth and playing obscene pranks. Since then, unable to suppress her desires, Satsuki begins to attack her son after a bath or while he is asleep, and she becomes more and more aggressive in playing pranks on her son. And her son also gradually becomes addicted to the pleasure Satsuki gives him...