Hanasaki, Sono

花崎園

He is a manga artist who writes men's hentai and ecchi manga, enjoying significant popularity among his target audience. Seiji Yamada, the protagonist of Sensitive Pornograph, is quite shocked to discover that Hanasaki-sensei is a man, as most of his fans (and fellow manga artists) believe he is a woman, largely due to his feminine appearance and personality. Seiji is a devoted fan of Sono Hanasaki's manga, admiring the cute girls and beautiful displays of eroticism in his work. Hanasaki is also a fan of Seiji Yamada's work, and eventually the two become lovers... rather than just colleagues.
Sono Hanasaki is actually 32 years old, even though he doesn't look like it.