[He's actually impressed that you not only look the part Mephisto, but that you're presenting good ideas. Granted, there's insincerity here and there, because you're definitely not that selfless, but William can ignore that, because those are both good ideas.]

Nothing makes people friends faster than money. Or enemies for that matter? How are we going to make it fair and keep one or the other from throwing some random tariff on one another's goods?