The sex life of a married couple has become stale. The wife, fed up with the situation, decides to buy a soap mat! She plans to use lotion on her husband, but for some reason her father-in-law, who lives with her, comes home earlier than planned! "Is it a present for Respect for the Aged Day?" he thinks, but he licks her big breasts, enjoys her perfect body, and when she ejaculates, her frustration finally explodes.