Because of You by Angel Payne

Darian Z. Everybody in the world is talking about the mysterious rock star. Fantasizing about him. Wanting him. And here he is, in my office doorway. Asking for me. I can’t do this. Or can I?

He will rock you…
The last thing Quinn Lemarr needs is the globe’s hottest rock star showing up—and insisting on working with her. But there’s more to Darian Z than she realizes.
Who wants to live forever?

Dario Sirocco has been hiding behind a fabricated persona for five years, though it’s not his first masquerade. When a guy is biologically incapable of dying, it’s a necessary evil. He can reverse the condition by killing a descendant of his family’s sworn enemy. But after one night of passion with Quinn, he can no longer take her life. His will never be the same again.