All couples are fun and easy to read but deducted 1 point for the only bonus because a few pages couldn't satisfy me after all the fun they give (I want to read more).

Nijima, the protagonist, is a friend in Be My Baby. You don't need to read Be my baby first before reading this. Be My Darling is a funny short chapter around 28 pages with a bit of smut. If you want to read a relaxing story that is a bit funny with some nsfw then I'd suggest you to buy one. PS. I don't know if there'll be any more chapters after this but the chapter can be read as one-shot story and it has a complete end within itself so you don't need to worry that the ending'll leave you hanging unless you want to read more of the relationship between them (like me).