Prior to the Civil War in America there existed slave owners that took their Mulato, Quadroon and Octagoon slave half-sisters as mistresses in New Orleans. The Quadroons Ball was a major social event. A tradition where the father took his half-sister as a mistress and his sons took her daughters sired by his father as their mistress and the grandson recieved the next generation of fine yellow girls as his prize.
A loving couple plan the next night's sexual escapades in which she will again fulfill his favorite fantasy, in exchange for the night out together she enjoys most. He gets excited on the way home from work thinking of how she is preparing herself for him and when he arrives home he is not disappointed. A good time is had by all.