Yumi marries a man with a son. From the moment she laid eyes on him, her stepson Ryota harbored feelings for her, his father's new wife. As he began to see her as a woman, Ryota started distancing himself. Desperate to get closer to Ryota, Yumi redoubled her efforts to care for him. Unable to resist Yumi's allure, the virgin Ryota masturbates by licking her underwear. Yumi, both surprised and aroused, witnesses this scene. Then, in a gentle voice, she whispers to Ryota, "Do you want to learn about adult kisses...?"
