His Bodyguard (The Lone Family #2)
Ace Fawn

Nick isn’t supposed to be attracted to the boss’s son. They have to keep their relationship professional, and Nick can’t let his feelings get in the way of his duties. But when Levi kisses him, Nick doesn’t want to hold back anymore.
One thing leads to another, and Levi gets Nick into his bed. They must keep their forbidden affair a secret, but that’s not easy to do when Levi has already let Nick into his heart and isn’t willing to let him go … even if they get caught.