It rarely happens but yes its possible for a Demon to possess a Vampire. The reason this phenomenon is rare lies in the truth that most demons generally look upon vampires as being way beneath them. Demons usually consider vampires other than First Generation as being nothing more than useful idiots at best. Of course, some such as the Second Generation Dracula impress them. Theres also the fact that the human souls of vampires are already...
Xavier Remington
I'm the Founder, and President of Mystic Investigations. Big time paranormal investigator and hunter of evil supernatural entities.