Pup: "Note" is a middle-aged man who is lucky enough to have a good-looking younger boyfriend named "Jean." However, he later discovers that he has a sexual preference for BDSM, specifically pup play. Note doesn't want to break up with Jean, but he can't stop himself from wanting to be a dog. He often secretly plays with a Master without letting his lover know. However, things are not as easy as he thought they would be.