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From one day to the other, Rosenheim and Elfriedden's political party obtained several allies, in fact, all surviving nobles became their allies. With every other noble dead, the entirety of the noble's future was within their hands, and as they all agreed to these two young new rulers to become their future, they were already pretty much King and Queen.
However, they also required the approval and recognition of the people. And as of now, although they had regained their hope, the people had yet to fully regain their trust of the nobles, even less when knowing even the King might have been a demon.
So the plan was quite simple, we clean the entire continent first and once that is done, we move to giving them the crowns. This way the people will be very happy they helped saving the entire continent, and therefore, would think its only natural for them to be given the crowns.