Repressed Royals Book Series

The only way to kill an immortal king is to seduce him first...  

As a princess in the Shadow Court, Sinna lives a painfully sheltered life. Like all immortals, she has but one weakness… Love strips away an immortal’s power, leaving them vulnerable to attack. So when her fellow mages peer into the future and learn she is destined to love a rival king, they see an opportunity to seize power.

Sent to infiltrate the Blood Court of vampires, Sinna must seduce their king, and steal his immortality. But the price of failure is high. A thousand lifetimes of torture and imprisonment await her if she's discovered--not to mention the enslavement of her people.

Maddox, the Vampire King, is no fool. But despite his initial suspicions, he longs for the company of his fated mate. So when Sinna enters his realm and challenges his restraint, he's eager to test his limits--and hers. But lurking in the background, darker forces seek to make pawns of them both. And when Sinna's own feelings are compromised, she starts to wonder if she has been the target all along.