Tempted (101 Nights #4)
S.E. Reign

The other makes my blood race and scrambles my ability to think - even after he destroys any hope I have of finding my friend Natalie on my own.
Unfortunately, that leaves us in a very awkward place. George needs my help to find Natalie, and I need his to stay alive long enough to track her down. Sexy, possessive, dangerous, irritatingly brilliant and completely emotionally unavailable, George is every nerdy girl's dream.
Except I'm pretty sure he, too, will try to kill me when this is over. We need one another, because Natalie is running out of time.
There's no real choice, if I want to save her. I have to trust him, at least for now, and he's not about to let me out of his sight.