In the astral plane exists the Caballi a vampire being, that preys on other astral beings. It can also prey upon humans who are passing through the Astral plane and sexually driven mediums.
Similar to the Inccubus/Succubus it seeks prey who enjoy satisfying their voracious needs.
Latching on to those humans and using their bodies during sexual activity.
Caballi is created when a man dies before his natural time. His soul travels to the astral plane. He keeps his mind, intellect, and desire to interact with the world.
The Caballi will possess a psychic medium so for a little while it will have a sense of sensation.
Daylight kills the Caballi, which will end any possessions.