Captive Omega by Eva Brandt

For as long as Luna can remember, she’s been a captive of her own weakness. An Omega. Useless. When her father arranges her mating with the Alpha of the Firewolf Pack, she knows she has no choice. For her pack’s sake, she has to accept and embrace this union. But the return of the chaos shatters everything, leading her to her fated mate, Rowan Savage, the brother of her would-be bonded.
Their relationship is forbidden, and there are still fragments of Luna’s past that she can’t abandon. Twin brothers Nate and Sam come back for her, claiming she is their mate as well. They’re rogues, exiles from the Wolfsbane pack, accused of murdering Luna’s brother–and yet, she can’t ever hope to let them go.
How is their four-way bond supposed to work? Luna has no idea. But her blood is on fire. Their kisses taste like death. And she is not afraid. She might be an Omega, but she will be a captive no longer.