The king was very happy, more than he could think of, he was giddy all inside, the thought of him aligning with the demon kingdom and securing the kingdom was very pleasing to him.
In a world with the existence of variation, He was always in fear to be over-powered by such an entity, the demons were the ones who surged out of nowhere and expanded their territory, with cruelty and ruthlessness.
He would be honored for having the demon lord marry his daughter, down to history, all the nobles who tried wanting his position would now fear to harm him, what so over, this was a kind of victory!
Now, sitting on his throne he was imagining the future he could create, he could widespread the existence of humans in the lands, not just live in fear of being doomed to existence.
He wanted to seal the marriage as soon as he could, he couldn't let the demon disappear out of his grasp.