Shinjin Adult Writer no Chousa Houkoku: Kurikuri Shiccha Dame...

Mako was aiming to be a reporter but ended up in a company as a sex writer. She's trying her best to accomplish her tasks although she's not experienced in sex. However her first task seems to be a bigger hurdle than expected... Guess her boss has to help out: "I'll teach you how vaginal orgasm feels way better than clitoral orgasm."
Note: Chapter count includes two volume-bonus chapters.