As a final year student at a university of drawing, struggling to think about a big assignment to be able to graduate on time, Ruka Kanai received a very attractive suggestion from her brother, which was to draw nude paintings and of course the nude model was also him. I thought that everything would go smoothly until I started working, then everything went in a completely different direction. The brother had just taken off his pants when the sister was stunned by the largest penis she had ever seen. Seeing that the big potato is liked, the desire to experience the thrill once, so she had a small proposal before starting to paint, which was to hope that he could meet his sexual needs, agreeing to have an incest relationship with her. Although he knew that this was contrary to morality, if he did not accept it, she would refuse to paint, so he had to reluctantly meet that lewd request.