After her husband dies, Kyoko moves in with her daughter and son-in-law Tact because they worry about her living alone. The family gets along, but she notices Tact acting strangely and learns that his cock is so big it has left the couple sexless. The news makes her wet, and under the pretense of helping them, she secretly begins servicing his ejaculations. Her long-neglected widow's body soon craves Tact's cock day and night.