Dhampira by Pennza, Amy;

Long description:

Corinthe has spent a lifetime longing for excitement outside her sleepy human village. As a dhampir born of a human mother and vampire father, her unique abilities make her desired by those who lurk across the Feyline-the boundary that keeps the magical realm in perpetual twilight where vampires hold dominion. To stay safe, she's concealed her supernatural strength and taste for blood from her human neighbours, but when her yearning for excitement accidentally exposes her gifts, she is captured to sell to the highest bidder. Terrified, she expects the worst. But rescue comes in the form of Vander, a handsome stranger who whisks her from the auction stage and across the Feyline... where he reveals himself to be a vampire knight of King Rasimir's court. Notorious for his cruelty, the deranged king is determined to extend his rule to the farthest reaches, and Vander has been tasked with delivering Corinthe to him. Now a pawn in the vampire court, Corinthe learns that Rasimir intends to marry her off to the arrogant Prince Lorcan and exploit her daywalking abilities for his own gain. But a wedding isn't the only obstacle in her path to freedom. While Vander burns with dangerous charm, Lorcan watches her with hungry eyes. And both men claim they can help her-if she can trust them.