Maya is a kind older sister who cares for her younger brother. One day, Maya's boyfriend comes to stay at their house. The three of them play together during the day, and at night, Maya and her boyfriend have sex and have fun. However, her younger brother is watching them. Thinking that Maya is just playing around and getting in his way, he begs Maya to do the same to him. Thinking that her younger brother has no sexual knowledge, Maya uses her own body to give him a sex education...