Ryo is exercising to release her sexual desire due to her husband's long business trip. One day, when her son's friend Kousuke comes to visit, he is captivated by the young, muscular cock he happens to see. She couldn't resist and approached him. At first, she cums many times and is very happy, but Kousuke has an unparalleled cock that doesn't last once or twice. The violent piston that doesn't know when it will end never ends