Houjou Urara No Renai Shousetsu O Kaki Nasai!

Briefly about Houjou Urara No Renai Shousetsu O Kaki Nasai! manga:

The story follows Nogami, a boy who writes novels online for fun. But one day, his secret is discovered by the famous girl in school, Houjou. As it happens, she's not at all interested in exposing him to the whole school. She just wants him to write some smut for her... Well, she never said she was't interested in a relationship with him either...