Binary Stars, Vol. 5: The Partners--The Guardian

The Heliotrope is a club run by two vampires, in a world that knows about their existence. The Partners: Rick, a young human, visits the Heliotrope because he's curious about the accepted arrangement between vampires and humans where vampires receive blood in exchange for providing humans with sex. The Guardian: David's a Guardian, a vampire who has taken on the duty of protecting the humans from the rogue vampires who hunt for blood rather than obtaining it in amicable exchange. David's on his way to the Heliotrope when he discovers a young human, Rick, being attacked and saves him. David is drawn to the young man.