Book 1 of the Omega House Series, an Alpha/Omega MPreg book.
Max was rescued from the Roger & Associates breeding farm...but he wasn't actually a breeding omega there. He was hidden away for most of his life by a caring beta, just trying to survive. When he gets to Omega House, he's not sure who he can trust, so he keeps everyone at a distance. Until an alpha walks in that stirs feelings in Max that he doesn't understand. They're scary and foreign...and arousing. He tries to fight the pull, but when he's placed in a dangerous situation, only one person is connected enough to help him.
Also in this series: