Forbidden Magic by Juniper Cole

For the first time in her life, Teryna was free and happy. She found her mate, learned that she still had family that loved her, and was reunited with her first love she’d thought dead for years.
But that freedom didn’t last.
Imprisoned once more by her mate’s family, Teryna is pushed to her limit as Cleo, Nico’s cruel oldest sister, works hard to break her. Suffering through the worst torture she has ever faced Teryna is closer to breaking then ever before.
But Teryna has had a taste of happiness and she knows if she ever wants that back, she’ll have to fight to escape.