Iori accidentally witnesses her son masturbating. She can't stop thinking about her grown-up son's hard cock, so she starts masturbating in her bedroom. The son feels something is off when he hears some noises in his mother's bedroom and peeks in. The son also witnesses his mother masturbating. When her son says he can't take it anymore, the mother accepts, saying "Just once." But the son isn't satisfied with just one time, so he begs for anal sex, saying "This is a good place, isn't it?"