The Cooliest's manga / #S & M(2)

First story is about a guy whose coworker finds an S & M in his home and blackmails him into doing his bidding. Second story is about a guy whose one night stand ends up being a prince whos looking for a fianceé. And the last is about a mystery novel writer meeting a detective.

Guy tutors this dude who worships him ever since they were kids. He also "tutors" him sexual stuff.