Kayo is happy that her son's best friend Kenta will be staying at her house for the first time in a while. - I was worried about my son's relationships at school, but it looks like my worries will be unfounded. - However, her relief is short-lived as her sexual desire, which she had suppressed until now in order to be a good mother, begins to bubble up. - She takes great care to masturbate so that her son and Kenta won't find out, but Kenta happens to stop by the bathroom and sees her in a lewd state.