Azriel grew up hearing about mermaids and sirens from hearing them from his brothers Cassian and Rhysand. They would often tell Azriel how the sirens were so beautiful that that was why they couldn’t come onto land as the fae men wouldn’t be able to handle there beauty. So Azriel never once imagined a mermaid would be his mate. Azriel and his mate’s relationship is confusing since she is scared to go into Valaris incase people find out she’s a mermaid and then her entire kingdom could be at risk