My older sister who works as an erotic manga artist doesn't know about a man's body, so she leaves the man's body to her assistant. However, all of the assistants are virgins too! So I used my younger brother's body as a reference when he was called to my sister's apartment in her workplace! He begins with a forced erection saying, "It's necessary to draw a realistic erect cock!" and says, "I want to see her face being given a blowjob!" and "I want to see her face being cumming!" and ends up having sex with all of her assistants, saying, "I want to see her having sex!" !