Too Much to Bear by Stormy Glenn

Randal Kersey had spent his entire life terrified of his father and brother, but the last two years had been the worst. Being denied his mate nearly destroyed him. When he was forced to kidnap the mate of the clan enforcer, he thought his misery had come to an end and wished only for a swift death. Instead, the alpha wanted to meet his very human mate.
Luca Buchanan had grown up around shifters, always on the outside, never accepted because he was human. Discovering Randal was his mate and they couldn’t claim each other under threat of death hammered home the fact that he would never be good enough.
When Alpha Colton offers his dream of mating Randal, Luca is all too happy to accept, but there are those that want to keep them apart, one for restitution because Randal kidnapped his mate, and one because his hatred has eaten away his soul. Not knowing who they can depend on, Randal and Luca have to trust the growing bond between them and hope that it’s enough.