Just the thought that Lucifer's seen through 1000s of deals over the millennia but this guy here, he's a bit more entertaining, his sense of pride is amusing, the guy's ego is so big he can't see how much he's humiliating himself in front of the Devil himself, but better yet, this human just doesn't care what anyone thinks, even the devil granting him power, kinda cute, not like your usual witch in the woods, or robed elite in some underground temple, this was a guy who didn't want to have to fear anyone, oh how much fear must lie in his heart, "precious" is what comes to Lucifer's mind. Maybe he can tend to this soul a little more closely~