Junjou Romantica. Usagi is a writer.
http://www.mangago.me/read-manga/home_tsuyuki_yuruko/
Fushidara Hanatsumi Otoko no, the seme is a writer.
here not much still you will find some useful stuff http://www.mangago.me/home/mangalist/290544/
mangas with some character as a writer?
i dont mind the genre tbh