Twisted Steel. Sons of Sin MC

Harper Quinn saves lives. Steel ends threats. As a paramedic, Harper is used to blood, danger, and men making terrible choices. But when a Sons of Sin MC shootout puts her in the path of Marcus "Steel" Holt, she becomes more than a witness. She becomes a target. Steel is the club's brutal Sergeant-at-Arms, a scarred, tattooed wall of violence who should terrify her, and he does. But he also protects her, listens when she says no, and makes her want things she knows she shouldn't.
When a rival MC marks Harper as leverage, Steel becomes her shadow. The closer danger gets, the hotter they burn. She saves lives. He takes them. And anyone who touches Steel's medic will bleed.