Eiori accidentally caught her son masturbating. She can't get the image of her grown son's erect penis out of her head, so she starts masturbating in her own bedroom. Her son hears strange noises coming from his mother's room and peeks inside. He also catches his mother masturbating. "I can't hold back anymore," says her son, who is accepted by his mother with the condition "just this once." However, once isn't enough for her son, who then begs, "It should be okay here," referring to anal sex.
