Faith & the Dead End Devils by Kathryn Moon

No one ever said not to bite the hand that unlocks your cage.
Faith Robins has been torn away from her brother, kept captive by an omega trafficking ring, and auctioned to the highest bidder. But when fate twists a new key in her lock, she finds herself in the care of an alpha named Bear, safe for the first time in ages.
She’s lost in this new world, surrounded by strange men, but she has claws now. And she’s prepared to dig them in and hold onto safety, no matter the cost.
The Dead End Devils aren’t a pack. They aren’t Boy Scouts. And if their prez, King, has his way, they’re getting rid of this broken and terrified woman at the first chance. Before she can tear their club apart.