Iron Master. Shifters Unbound, #12

Stuart Reid is an Iron Master-a Dark Fae with a rare ability to make iron do his bidding. Exiled by the High Fae who fear him, he now lives in a simple house in Shiftertown outside Las Vegas, watching over Peigi, a bear Shifter woman, and the cubs she cares for. Peigi, rescued from an evil Shifter and welcomed into the Vegas Shiftertown, knows Reid and the cubs have helped her survive and heal. She also knows Reid is alone and lonely, a strong man coping with his exile.
The bond she feels pulling her to him scares the crud out of her-she's been down this road before. When Reid's people send him a desperate call for help, Peigi senses danger to him-too much of it. She finds she'll do anything, even sacrifice herself and her happiness, to keep him safe.