In Joe Hill's short story, the Black Phone is a key and mysterious element. It's an old, black rotary phone that seems to have a strange connection to the main character's situation. It may symbolize a link to the outside world or something more supernatural.
Joe and Leslie Black's love story could be filled with many beautiful moments. They perhaps met through mutual friends at a party. At first, they just exchanged pleasantries. But later, they kept running into each other. They started to talk more and more. Joe was attracted to Leslie's kind heart and Leslie was drawn to Joe's sense of humor. Their relationship grew slowly but steadily, and they became a couple that was admired by many.
I'm not sure which specific 'Joe Black story' you are referring to. There could be many stories related to someone named Joe Black. It could be a personal story, a fictional tale in a book or movie.