This role-play is performed by adults. When Yukari learns that her son's friend is a virgin, she decides to take on the role of his friend just for fun. She was supposed to enjoy playing with a naive virgin for one night and return to her daily life without any problems, but... ``I can't sleep at night remembering that day. Please, aunt, please let me hold you one more time.'' The runaway boy piston who keeps inserting himself keeps forcing me to climax, and my pleasure nerves are overheating.