A married woman comes to a hot spring resort famous for helping couples conceive, accompanied by her husband. Seeking fertility benefits, she opts for a massage session. As her yukata is lifted, her astonishingly huge breasts are revealed. During the meticulous oil massage, she twitches and reacts intensely, clearly showing how her female hormones are surging. Though she knows her husband mustn't find out, her pleasure continues to build, making it impossible to suppress her moans. While tearfully expressing guilt over letting another man do such things to her, she ends up having unprotected sex with the therapist. When his hands touch her womb, she whispers "no," yet her massive breasts heave violently in response. Overwhelmed by pleasure, she is driven toward certain pregnancy.