Even though she is her husband's only son, Aki Sasaki always loves, cares, and takes care of him extremely thoughtfully. Suddenly one day she discovers that her son has reached puberty because of the pile of tissues he used. sex left in the room. Sasaki was extremely worried because her child often showed strange signs, afraid that it would make him depressed, so she discussed it with her husband, but the husband didn't seem to care much, just gave her a JAV DVD and Tell your son to see it. The perverted son often fantasized about having sex with his stepmother and masturbated every day, more and more often, making him very stressed and angry. As for the stepmother, she lacks sex because of her old husband and after days of thinking… She decided to directly teach her son about sex instead of letting him watch movies.