Mariko is delighted when her married daughter stays in the family home and they begin living as a two-family household. She also gets along well with her son-in-law Takuto, who has recently been working from home more often. After repeatedly catching him masturbating, she asks what is wrong and learns that his cock is so big her daughter no longer wants sex with him. Neglected by her own husband and aching for release, Mariko tells herself she is helping their marriage as she begins servicing Takuto’s huge cock until he cums. The more she plays with his shaft each day, the harder it becomes to suppress her own buried lust...