Looking For an old old story

Years ago probably before most of you were born, before Al Gore invented the internet, I read a story about a white couple who had some black neighbors. The white husband was talking to the black neighbor woman about how his wife would never go black. The black neighbor woman bet him that her *** could seduce his wife into going the black. The only stipulation was that the black boy couldn't encourage it by touching the white wife in any way. Does anyone know of this story, Any help would be appreciated. Thanks