Griffith. The English Dragon, #5

Griffith was a very old and powerful dragon and just the opposite of his twin James. The only thing they had in common was their looks, they were identical. James, although first born and immortal, didn't inherit the dragon gene and had held that over Griff's head their entire lives. Anything Griff got, James felt it should be his instead. Griff found his mate, Lilac, by chance. She had just barely escaped James's evil clutches, and the moment she saw Griff she was terrified that they were one and the same.
Lilac was a water faerie and daughter to the queen of faeries which made her queen of the water, but that was a secret she would have to keep to herself. That knowledge in the wrong hands could spell disaster, especially if James found out. Lilac was slow to trust, but Griff made it difficult not to love him. And when Griff suddenly disappeared, would he be able to forgive her for holding such a secret? Trust worked both ways and that was one huge secret.