Aya lives with her husband and daughter-in-law. On the surface, things are going well, but she hasn't had sex with her husband for a while, and every night she releases her pent-up sexual desire by masturbating. One day, she witnesses her son-in-law Takeshi's huge cock, who is also alone and not having sex with his daughter... Kokoro by his cock, Aya invites him day and night, saying, "I'll take care of you for you," and continues to milk him. And the son-in-law is completely captivated by the alluring charm of his mother-in-law, who doesn't have a wife...