Harpy

Greek mythology is full of depictions of Gods, Goddesses, good and evil creatures, and good and evil men and women. Among them are the Harpy Sisters as they are called though they are not related, who are two particularly nasty creatures. The Harpy, which was created by Zeus to punish his enemies, looks like a fusion between a human female on top and a big bird below that ends with clawed feet.

As are all of Hell's denizens, Harpies are not capable of reproducing despite their prolific sex drive that literally rules their lives. The Harpies, though, are unlike their fellow demons and loathe most of them with a passion.

To their relief, soon after being placed in Hell and sent to Earth to perform their evil deeds, the Harpies discovered that, they were physically compatible with human men and derive sexual pleasures from them. Their problem was that in order to entice men they had to shape-shift into a human female form, which they didn't like but considered it to be better than to couple with repulsive demons.

Being extremely cunning and manipulative by nature, the Harpies always sought a solution for the problem. They constantly experimented in ridding themselves of the need to use humans and a few almost tolerable demons to derive their pleasures.

This story is about one such experiment that proved to be quite successful for all concerned.