King of Khoth by Brenda Trim, Tami Julka

Dragon shifter, Angus Callanach, is returning to his home realm after one of the Vampire Princes reopens the portal to Khoth. Having spent two hundred years as the majordomo at Zeum, he is ready to once again take up his mantle as the king of the Cuelebre. Life seems sublime when his millennia long search for the love of his life, Keira ends. That is, until he discovers she has no recollection of him or their relationship and she is firmly in the clutches of his archenemy, Cyril, the Unseelie King.

Keira wakes up in a strange cave, clueless about her identity and the world around her. Everything she is told comes into question the moment Angus crashes into her life. Kidnapped for the second time, she is taken to Khoth and discovers she is a powerful sea dragon princess with intimate ties to the Cuelebre. Overwhelmed by it all, she swears off relationships so she can focus on regaining her identity, but the passion that ignites between her and Angus is hotter than the fire he breathes.