Akari remarried, but now has a busy husband and a stepson who has become reclusive. Akari is happy to be with the man she loves, but she also feels lonely. She witnesses her stepson Kazu masturbating. Unable to hide her excitement at his young, rock-hard dick, Akari secludes herself alone in the bathroom and fantasizes about having sex with Kazu while masturbating. When Akari finds out that Kazu has become reclusive because he was dumped by a girl, she decides to get him used to touching a woman's body in order to overcome his trauma towards women. Akari, who has not had sex with her workaholic husband, finds Kazu cute as he awkwardly touches her breasts, and eventually shows her feminine side to Kazu, who starts to push his way towards her. Akari feels an unbearable pleasure from Kazu's rock hard dick, which he thrusts into her frantically. Kazu is so absorbed in the sex he just learned that he wants to have sex with her, and Akari regains her womanhood... The two share a sense of guilt towards their husbands, and they make love to each other's bodies day after day, devouring each other's bodies, and they cross the barrier between parent and child in a forbidden act of incest...!