Maya is a kind older sister who cares about her younger brother. One day, Maya's boyfriend came to stay at my house. Three brothers played together during the day, and at night, Maya and her boyfriend enjoyed having sex. However, his younger brother was watching the act. Thinking that he is playing around with himself as a nuisance, his younger brother begs Itoyama to do the same. Thinking of her brother who has no sexual knowledge, Maya gave sex education with her own body.
