Mao takes up a new hobby and starts attending a drawing class. She is suddenly asked to draw a naked man, and though she feels embarrassed, she can't help but stare at him. In the second class, she acts as a model, but gradually her clothes are taken off, and she gradually becomes excited and wet from being watched... In the end, she is completely naked, and while her big breasts are played with, she has an orgy with the teacher and all the students...