Chaoyang, who has a hobby of muscle training, discovered that his son's friend, Kentaro, lacked exercise and taught him various things. The size of the crotch that she accidentally touched reminded her that her sexual desire could not be completely dissipated by practicing alone. And Chaoyang, who lost his desire, tempted him by playing with his cock … However, her body climaxed many times due to his stubbornness and continued to cry out in pain. Chaoyang finally gave up on his unparalleled intercourse for what seemed like forever.