Trinity — Jamie K. Schmidt

Marta needs a vampire fang and a werewolf claw to make a protective amulet to break her sister's enthrallment to an evil incubus who wants to drain their coven of their power. Her ex, Cassius, is a vampire, and she'd love to knock his tooth out--because after she told him she wanted to be his exclusively when she caught him in a blood orgy, he let her walk away.

Even though she's a powerful witch, she's not strong enough to take on a vampire â€" especially one who could make her orgasm with a thought. So she hires MacKenzie, a werewolf mercenary, to do her dirty work. Not to do her. But their chemistry explodes into a scorching one night stand.

It turns out Cassius wasn't actually ready to give Marta up. He crashes the one night stand and demands that Marta and MacKenzie use sex magic to seal the incubus's access to their world forever. Sure, it'll work. But if Marta becomes part of the threesome, her dreams of having a monogamous relationship will go right out the window, and leave her with an emotionally distant vampire and a half-mad werewolf in her bed.