Izumi, who enjoys a happy married life, is troubled by her sex life with her husband, who rarely engages in foreplay. Late at night... she hears her in-laws moaning. It turns out her father-in-law also suffers from erectile dysfunction, and she has been bringing him to orgasm repeatedly through cunnilingus alone. Her father-in-law's cunnilingus skills have improved dramatically, and it hits her right on target...! He gets another erection and, before she knows it, penetrates her...! "Izumi... cunnilingus feels good, doesn't it? This might be the last erection of my life...! Let me fuck you..."