Her husband is kind and considerate, but their sexual relationship is lacking. Living this way, Chisato Shoda harbors daily frustration until, on impulse, she begins helping her son ejaculate. Excited by her son's strong erection, she starts seducing him. Noticing her behavior, her son begins treating her like livestock, forcing her into sexual servitude. Yet Chisato secretly desired this training. Deep inside, she harbored masochistic desires, craving the pleasure it brought her...