The demon lord is testing Du Jour to see if he still has feelings for him. If he does, the demon lord will kill him immediately. The emperor is here, and he can't get lost. He's the only one who can protect the emperor, and now he's just a tool of the emperor's. It's clear that the emperor has fallen in love with du Jour, but he didn't mean it. Now that everything is clear, the two of them are going to get married.