Amon by Lynn Hagen

After Eleazar rescues Sonny from a self-destructive life, Sonny goes to work for the most powerful vampire in Ridgeway. To protect Sonny from some coven members who only look at humans as food, Eleazar assigns Amon to watch over him while he works. Only, Sonny is attracted to Amon, but he keeps the vampire at arm’s length because Sonny doesn’t want to be hurt again. But when someone from a radical group targets him, it’s Amon that Sonny turns to for help.
Amon has known heartbreak in the past, but he’s drawn to the petite, androgynous man who draws him in a way he can’t resist. He’s enamored with the human, even if it’s killing him to be near the man who keeps freezing him out. Until Amon learns that Sonny is his mate. When Sonny’s life is in danger from a group that is targeting humans who help vampires, Amon steps in to show his mate that he will move heaven and earth to keep him safe.