Saki moves in with her husband’s parents after his job transfer. At first she is delighted to see how affectionate they remain after 30 years of marriage, but she soon discovers that her father-in-law has a terrifying sex drive and pounds his wife almost every night. The obscene moans and wet sounds drifting through the house make Saki’s pussy throb, and she begins spying on them while masturbating. Longing to be taken just as savagely, she finally makes up her mind and approaches her father-in-law herself. Unsatisfied by the bland sex she has with her husband, the aroused daughter-in-law sneaks into his room at night and begs for his tireless cock, then loses herself in their intense, forbidden sex.