There wasn't a reason for Placake to refuse that. If the demon beasts were the only ones who obtained the twins' knowledge, perhaps it would be better to keep everything a secret. However, the humans had Havek, who knew how to make them, so it wasn't very smart.
Since the twins had Placake's claws near their dantians, Placake decided to let them out after they arrived at their destination.
Rean and Roan looked around and saw that Placake wasn't the only dragon anymore. Instead, they saw many of them. It's just that although they were all dragons, they were very different from Placake. It wasn't just Placake's azure color, though. "Are there no other azure dragons?"
Placake shook his head, saying, "The Azure Dragon only appears when they get a Regal Bloodline. At the moment, I'm the only one."
