I like using the terms "Daddy, BlackPapi, Mr. Black" It just depends on the situation we are in. I am really big on how things sound to myself and their reaction on what I am saying. So if I say one of these terms, and i get a positive reaction or a reaction that I enjoy then I will say it more.
we are still in the beginning stage so who knows I might think of other cute names as time goes on. IF things work out nicely.