"No, there aren't any other demons around that I know of. There is a version of Lucifer, who I don't know very well. A couple of angels from other universes... oh! And a handful of demon hunters, but I honestly don't think you'll have any trouble from them."
It wasn't difficult to notice how easily Crowley got flustered by complements, and Aziraphale decided he rather liked that. Dropping his hands from Crolwey's shoulders to tidy up the lapels of Crowlwy's jacket, he sweetly said, "You're the only demon worth thwarting, in my opinion. The only one I'd want to thwart."