[He's not bothered by even the slightest twinge of disgust, because he goes by the results, not by the nature of it. It's not necessarily an awful spell to him- all it does is make someone be honest with him for an hour and then they get wet cat pissy and that's the end of that.

He's terrible at convincing people of anything, but he's not gonna admit it.]

That's fair. And I don't even know what exactly I should be asking. You could do the questioning if you like. All I have to say is that he should answer your questions as honestly as he can, and he'll do it. You'd get about an hour of cooperation out of him.