"I've got a suggestion for you. I'm going to give you a contract that you have to sign. Your dragon race will serve the humans as vassals for 100 years before you regain your freedom. At that time, you will be allowed to go back to your own world. What do you think about that?"
The leader of the dragons looked at Henry silently. He silently considered what Henry had said. In real sense, 100 years were not that much to the dragons. But of course, the only problem here was the fact that Henry was asking them to be under the humans.
It might be true that they were just vassals, but nevertheless, they would be commanded by the humans. If it was Henry, since he had already convinced them with his own strength, they could definitely submit. But if it came to the rest of the human population, that was definitely something that they were not willing to do.