Shinichi, who also has a wife and children, spends his days thinking about his mother, Eri, as a woman. One day, when he couldn't control his overflowing sexual desire, he decided to go on a hot spring trip with his girlfriend's mother, if only once... Eri thought that her father and son were in love with each other... Eri thought the story about her son was a joke, but she surrendered to the swell of pleasure as she saw a man in front of her for the first time in a while. She couldn't resist the pleasure of having her son's hot milk deep inside her body. A mother-son incest story where forbidden moans echo in a hot spring deep in the mountains.
