Lights Out by Josie Kerr

Christopher Schuyler wasn’t someone who got many breaks. After eight frustrating years working as a club bouncer and fighting on the amateur circuit, a prestigious MMA training gym offers Chris an opportunity he can’t walk away from.
Paul Decker knows something about dating athletes, and that is an experience he never wants to repeat. It’s taken him two years to get over his last break-up, but he’s finally getting back into the dating scene.
After a particularly gruesome social event, Paul uncharacteristically ends up solo at a gay dance club. A literal run-in with Chris brings the two men together, and soon they are both taking chances they had never imagined. Taking risks is one thing, but are they strong enough to overcome the skeletons of the past?

*This book contains references to self harm and domestic violence.