One day, Reona, who was living happily with her husband, is asked by her husband to take care of his injured father-in-law. Because her father-in-law is stubborn, her helpers quit one after another, leaving Reona alone. Due to these circumstances, Leona reluctantly ends up going to her father-in-law's house, which she is not good at. Day by day, she and her father-in-law became more acquainted, but one day, while cooking, Leona inadvertently cut her finger. When my father-in-law saw this, he licked and sucked Leona's fingers as if he had changed into a different person. Leona gradually started to feel the intense and dense use of his tongue...