Eva smirked at his suggestion that girls fall at his feet.  But she went on to explain.  "A familiar, I don't know what you call it, but is a human that willing donates their blood for you to feed on.  I think someone called them slaves, but I don't like that term, its like they can never leave you, and that just isn't our way back home.  No one is forced to do anything they do not want to."