Inu mo Arukeba Koi wo suru

A super popular novelist who writes BDSM erotica, falls in love with a sweet graduate student. "What? You want me to be a character in one of your novels!?" One day, the grad student gets a phone call from his former classmate. He agrees to help, only to find out the novels his friend writes are all BDSM! A grad student's aggressively pursued by a bespectacled, good-looking and talented erotica novelist.

(Source: Renta!)