Satsuki, a beautiful married woman, is hurt by her husband's infidelity. Her only comfort is the presence of her kind father-in-law, but it doesn't take long for their familial love to turn into love between a man and a woman. Gradually, her father-in-law reveals his true sadistic nature, forcing her into humiliating acts and giving blowjobs to other men. However, Satsuki, now a slave to carnal desires, happily accepts her father-in-law's creampie sex!