The son cannot forget the translucent skin of his stepmother, Rumiko. He peeps at her in the bath, sneaks into her bedroom late at night, and masturbates using her as his fantasy. Emboldened by alcohol, he confesses and begs for fellatio. It progresses to forbidden insertion. Though he knows it's wrong, he pushes beyond the limits of his restraint, approaches his stepmother Rumiko, and reaches forbidden sex.