Miki sees her son's friend Kosuke masturbating while he's staying the night. Kosuke's embarrassment sparks a mischievous side in Miki, so she invites him over for a drink and seduces him, but... Kosuke's insatiable penis isn't satisfied with just one ejaculation, and he devours Miki's body again and again, ejaculating repeatedly... From that day on, Kosuke continues to visit the house many times, and they continue their physical relationship, but Miki's body finally begins to scream in pain from his insatiable sexual prowess...