Wish it Were You. The Cage Family, #6

Flynn Cage knows a few things about life. How to make profit. How to keep his family safe. And how to leave when the world breaks in order to save those he loves. Only he didn't count on Luna Blair. Walking away is impossible when it comes to the woman who haunts his dreams. Luna Blair told herself it was just a secret fling when it came to her new brother-in-law, Flynn. Yet every time they stay it's over, the world pushes them together again.
When the temptation becomes too strong to deny, they give into the passion. But when the secrets they've long kept buried resurface, it just might be enough to tear them apart for good.