Soredewa Sensei, Onegaishimasu.

Akasegawa is a novelist who writes erotic novels. He gets the inspiration to write by flirting with the female editor in charge, but this becomes a problem for the editorial department. One day, a dull-looking man, Marutomi, shows up at his house and announces that he's the new editor in charge.

Akasegawa is not in the mood to write so he teases Marutomi by saying, "I can't write until you make me feel like it. You can't do it, can you?" But he gets an unexpected reply, "If it'll you write..." Akasegawa realizes that Marutomi might be more amusing than he expected...!

(Source: Kadokawa, translated)