Nana, a wife, has a secret that she cannot tell her husband. She has had a forbidden relationship with her stepson, Jun. Nana is confused by Jun's increasing boldness... He starts to make advances on her, even though she has a husband... She worries that if things continue like this, her husband will find out about their relationship, but she cannot resist Jun's feelings and caresses, so they continue the relationship. And the fear that her husband might find out... fuels Nana's excitement even more, as she climaxes multiple times...