Taken By the Vampire King by Laura Kaye

Seven ancient vampire kings.
One fight to save humanity…

Henrik Magnusson is supposed to be immortal, but a mysterious ailment leaves the Vampire Warrior King near death, and not even the blood of the Proffered—human virgins trained to feed and mate with the elite warriors—sustains him. Then he rescues a beautiful young woman from the Soul Eaters, his ancient enemies, and she sets off a bloodlust and a desire he hasn’t felt for centuries.

Photographer Kaira Sorenson’s life takes a nightmare turn when she’s saved by a…vampire. But she’s seen too much, and now she’s his prisoner. All of which means she should be afraid of Henrik, but he’s regal, tormented, and hot as hell, and she can’t deny her intense attraction to him. And then she learns that her blood may be his only salvation…

Kaira knows what it’s like to be sick, so she agrees to help Henrik. But when feeding turns into a scorching night of so much more, she must decide if she’s willing to be his forever—but will the king release her so she can freely choose?