Blood Solace by Vela Roth — book slip

Lio, an immortal Hesperine, is caught in a perilous situation as his craving for Cassia's blood threatens his life. An ancient spell and deadly politics keep them apart, but when Cassia's life is also endangered, Lio devises a plan that could save them both or leave the Hesperines vulnerable to their mortal enemies. Cassia, acting as a secret protector for the Hesperines within the human court, must balance her acts of sabotage against her tyrant father with the need to protect Lio and their love. As tensions rise, Cassia must step out of the shadows, risking everything to change the fate of two worlds.

For fans of 'Blood and Ash', this series offers a blend of steamy romance and classic fantasy worldbuilding.