The Alpha’s Scientist by April Kelley

A scientist in trouble. An alpha rebuilding his clan’s trust. When the enemy is your fated mate, love gets very complicated.
Easton Piernos has escape on his mind. Forced to experiment on unwilling victims, he needs to find the only person he can trust—his brother. His search leads him to a small town filled with very large, green-eyed monsters. The biggest one of them calls Easton the enemy…and his mate.
The alpha has a lot to prove. When Gavin Drolac meets Easton for the first time, he pegs him as an enemy, but Gavin has an instinct to protect the little human. Who will Gavin have to fight this time? The clan or some sort of external force?
For Easton, the enemy of his enemy might just be the only one who can free him from his captors for good. To do that, he has to win the trust of the alpha.