A year ago, her son suddenly became lethargic. Then he couldn't move his body, and now he is bedridden. His mother is caring for him with great care. However, she is troubled by an unknown illness. One day, her son approaches his mother. He says that he feels itchy between his legs. As his mother touches him, hoping that it will help her, his legs become erect, and she helps him ejaculate as her son tells her. A few days later, her son calls his mother again. His hands are moving. With his now mobile hands, the son kneads his mother's breasts, and says that it is for his rehabilitation, and asks to have sex with his mother. Although the mother is troubled, she thinks that it is for her son's sake and presses her private parts against his hardened legs...