Doukyonin no Sano-kun wa Tada no Yuunou na Tantou Henshuu desu

Shinomiya Teiichiro is a prolific, workaholic novelist who is too consumed with writing to take care of himself. To prevent him from neglecting his well-being, his editor, Sano Satoru, moves in with him. But when the calm and collected Shinomiya finds himself flustered by Sano's constant presence and good looks, he begins to question their relationship. After all, Sano is just his editor, isn't he?!

(Source: MangaUP!)