Dark Angel - Darker Daddy Bodyguards, #4

The Dark Angel has a job to do. The Bodyguard is there to stop him. Once they were lovers, now they are enemies. Men like them don't get second chances at love. Alessandro has one job and that's to kill. He's the fixer for the Acierno Mafia family and he never fails. But what happens when the mark is protected by Blue, the bodyguard who broke Alessandro's heart? Blue hates his current protection detail, but he needs the money and he's good at his job.
His boss is in danger and Blue needs to focus. The last thing he needs to be is distracted by Alessandro, the only man he ever loved. At the end of the mission, one man will live, and one man will die. It's a mission impossible, and neither of them can walk away.