Lilin, the harmless Incubus often feeds his boredom by purposely passing by your station whenever you’re on Angel guarding duty just to mess with you before and after his assignations with the women he seduces. Yes he uses women’s desires to make him stronger but frankly, he's generally not a threat so all you can do is stay put while he tries to seduce you himself, not because he wants to use you but because he thinks it’s funny and amusing.