One day, Reona, who was living happily as a couple, was asked by her husband to take care of her injured father-in-law. My father-in-law was stubborn, so the helpers quit one after another. Due to that circumstance, Reona reluctantly goes to her father-in-law's house, which she is not good at. - She and her father-in-law get to know each other day by day, but one day, while cooking, Reona carelessly cuts her finger lightly. - The father-in-law who saw it licks and sucks Reona's fingers like a changed person. - Reona gradually felt the intense and dense use of her tongue ...