Reona Tomiyasu's marriage had been going well until one day her husband asked her to help care for his injured father, as the man's strict personality had driven away one caregiver after another. Eventually, the responsibility fell to Reona. Though their relationship started off awkwardly, they gradually grew closer. One day while cooking, Reona accidentally cut her finger. Seeing this, her father-in-law suddenly changed demeanor, passionately licking and sucking her wounded finger. Overwhelmed by his intense, skillful tongue, Reona slowly begins to feel an unexpected arousal building within her.