Mikuru has been undergoing fertility treatment for the past three years, but her father-in-law has been providing financial support due to the high cost of medical care that is not covered by insurance. However, at a family meeting, the support was terminated, and her husband begged her father-in-law to continue. Her father-in-law wanted to get a taste of Mikuru's body, so he offered to have sex with her just once in exchange. Her husband had no choice but to agree, and persuaded his wife to have sex with him. Her father-in-law embraces her in front of her husband, but as soon as her husband leaves the room, she becomes intoxicated with pleasure, perhaps due to a sense of guilt, and climaxes multiple times. Unable to forget the pleasure, she later goes to her father-in-law's house, excited by the fact that he is playing with her as he pleases, and climaxes multiple times.