Sticky Ties by Susi Hawke

In a world where the rules are gray and the Don’s word is a law unto itself, only one thing is sacred… family.

Boris Novak watched four of his brothers find happiness with their fated mates, but never considered he might be that lucky. When a family member dragged in a fainting goat shifter suspected of working with their enemies, it took only one scent for Boris to recognize his mate and know that he’d fight anyone and anything to protect him.

Even if it meant fighting his own family.

One year ago, Gary never would have imagined being caught up in such a mess of crime bosses, turf wars, and smuggling. He’d never imagined anything beyond a quiet life. Until that life was stolen from him.
Together, the two find a wholeness that neither looked for, but deeply craved. But before they can find peace, they have to defeat the woman who killed Gary’s family and tried to kill Boris’s father. All while keeping Chicago from erupting into a street war, saving kidnapped kids, and avoiding the eye of the Feds.