Kyoko is concerned about her son-in-law Takuto's suspicious behavior. After losing her husband, she started living with her daughter and son-in-law, who were worried about her living alone, and their cohabitation has been perfectly harmonious. However, behind the scenes, Takuto's dick is too big, leading to a sexless relationship with her daughter. While worry crosses her mind, Kyoko's secret excitement wets her crotch, and she keeps making excuses to herself that it's "for their sake," secretly devoting herself to servicing his ejaculation. Her body, which hasn't experienced pleasure since becoming a widow, begins to crave Takuto's cock intensely day and night, and her uncontrollable desire grows stronger.