Reiko, while her husband is away, is lured into her son's room. Though she had promised herself it would be just once, she can't resist being drawn back again and again. Tonight, she is once more enticed into her son's room, separated only by a single sliding door from her marital bedroom. With the door flung wide open, Reiko is caressed and pleasured, fully aware her husband lies asleep just next door. Overwhelmed by the thrill of forbidden desire, her heartbeat races uncontrollably. This fleeting inner conflict only deepens the intensity of tonight's illicit encounter.