My neighbor's son, Toshio, suddenly had his mother leave home, so I agreed to take him in while his father worked. At first, I was unsure, but seeing his lonely expression, my heart ached, and I decided to become a mother figure for him. As I cared for him daily, our bond gradually deepened. One day, while baking cookies to cheer him up, butter spilled onto my crotch. Without hesitation, Toshio began frantically licking it off. Overwhelmed by his intense tongue movements, I trembled with uncontrollable desire.