Spirit Lovers.
Many denizens of the spirit land have connection with mortals. We have the cycle of folk-tales known as that of the Swan maidens.
Urvasî came and lived with Parûravas until he broke the curiosity taboo. We shall see instances where Indra gives one of his fairies to a mortal lover, and spirits like the Incubi and Succubi of European folk-lore can be brought down by incantation.