While her husband is on a transfer to the countryside, Yuka lives with her children and son-in-law Takeru. Unable to see her husband, she leads a frustrated life and learns that her daughter's couple has not had sex in a long time... One night, Yuka catches Takeru masturbating alone. Dazzled by the size of his penis, Yuka tells herself that she must release her son-in-law's sexual desires instead of her daughter and begins to seduce him. From that day on, Yuka becomes infatuated with Takeru's penis and starts craving her son-in-law all the time...
