Minami has been married into her husband's family for three years. She has a good relationship with her father-in-law, who lives with her, and lives happily, but there is one thing that bothers Minami. Since they got married, they have only had sex once a month. That day, as she heads to the bathroom after sex, she bumps into her father-in-law. He has been listening to what they are doing, and realizes that she is sexually frustrated. Excited by the wife's hot body right after the baby-making sex, her father-in-law pushes Minami down and repeatedly pours his semen into her vagina with his tireless, insatiable cock...