The Beast Like Me - The Wolves of Wharton, #6

Everything is for the good of the pack, but Hunter isn't a wolf. The last eighteen months have been the most tumultuous-and the most gratifying-of Hunter Bailey's life. With Angus at his side, he thought he could endure anything, but Hunter is still reeling from losing Leigh. How is he supposed to live with himself, knowing he caused his friend's death? Hunter worries he's not as strong as his wolfish boyfriend.
But what if he could be? Angus Chilton is unwavering in his purpose: protect the pack, and, above all, protect Hunter. It is a dictum that has served him well, but there's little he can do when his boyfriend's worst enemy is his own conscience. There's no ripping the throat out of a nagging thought. When Hunter asks to be transformed, Angus finds himself at a crossroads. He knows their relationship won't survive if he refuses. While a life-changing choice is being made, bodies are piling up and humans have started to notice.
The police are asking questions, and a wolfhunter with ties to the pack has the couple in his crosshairs.