[ Beel is absolutely fair for that.

Merlin makes a show of looking briefly pouty when he says something like that for kicks, of course. All in good fun over here, buddy. ]

Hmm, yes. Demonic power for the exchange of someone's soul is one of the oldest cliché, but very common 'contract' I've ever heard of.

Well, I guess I'm not entirely surprised if someone ever becomes greedy with them. It sounds like there's a lot to gain~