To fulfill a client's desire for a sexual relationship with a family member, Takagi Takefumi reveals a special plan. A son, who discovered his parents' sex photos during his school days and used them for masturbation, now seeks more fulfillment. He arranges for his mother to visit a fake massage parlor, where staff begin sensual treatments on the spot. The mother gradually becomes aroused, breathing heavily as excitement builds. She confesses she hasn't had sex with her husband in ten years, has been a heavy masturbator, and constantly carries a toothbrush. Using her personal toothbrush and a vibrator for pleasure, she reaches climax after climax. Then, a fake son appears, blocking her view, joining the male staff in dominating her. The mother is forced to take two men's penises into her mouth simultaneously, continuing to writhe and orgasm with intense, agonized pleasure.