Thin Ice by HJ Welch

Kamran’s ex broke his heart, tricked him into aiding a bank robbery, and now he wants him to do one last job. There’s only one way to say no: seek the protective custody of the biggest, grumpiest FBI agent ever. And pretend to be his boyfriend for a week-long family reunion in their giant mansion. Wait, what?
Agent Lee Marshall is notoriously all work and no play. Letting a flirty, hot-as-sin playboy like Kamran get under his skin is not an option. He has to protect him, not hook up with him. But pretending they’re an item for a week? That couldn’t hurt…
Kamran swore he’d never love again, but Lee will do anything to keep him out of harm’s way. Maybe there’s a teddy bear heart under the hunky FBI agent’s gruff exterior, and Kamran is the only one who can tease it out. What started out fake becomes all too real, but when Kamran’s past catches up to him, Lee must risk everything to save him.