Runes — Em Petrova

When immortals Will Cochran and Evangeline Mayer are thrown together by a phenomenon known as The Calling, they breech the barriers of a conventional relationship. By sharing their blood and bodies, their minds and souls are also entwined. But Evangeline has been yanked from the arms of her mortal love, Sean Livingston, and the echo of his touch never leaves her.

When she's kidnapped by a sadistic immortal seeking revenge for the loss of his own mate, Sean is summoned as a means to torture her. Their reunion both titillates and torments her new mate, Will. He and Sean make a pact to share the woman they both love, and find new desires arising in the arms of each other.