"Dancing Under the Moonlight"

Prompt: write a story about a wife convinces her husband to try a Menage A Trois. the husband reluctantly agrees, and is surprised she introduces him to a male magician who performs a trick on him, separating his head from his body, which starts moving and acting independently. the wife and the magician then seduce and arouse the body into joining them in a threesome, using the man's head as an erotic prop in their erotic escapade.