Defying the Moon — Cheryl Dragon

This is the prequel to Outsmarting the Moon. Brian's life is simple -- screw hot guys and catch bad ones. But when the one man he can't forget rescues him and finds out a secret even Brian doesn't know, his life takes a new turn. Brian is a werewolf. Desperate to find a cure, he keeps Ed close for protection and turns to his sister, a zoologist, for help. Being so close to Ed reveals all his insecurities but Brian fights his feelings. Out of fear, Brian pushes Ed away one too many times. Only then does he realize keeping Ed at arm's length won't make it better. Ed is all Brian needs to face whatever lies ahead. He just has to win him back.