Suddenly, her brother-in-law, who lives nearby, comes into her house, asking to stay for a few days... That night, she and her husband make love and she makes her husband's penis feel good with her mouth, but he finishes early, and Rikako, not satisfied, indulges in masturbation in the bathroom with an adult vibrator that she had secretly hidden. At that time, Rikako happens to run into her brother-in-law, who roughly massages her breasts, squeezing breast milk out of her taut breasts... Unable to suppress her heat, Rikako instinctively takes her brother-in-law's penis into her mouth...