Ruin Me by Ariana Nash

After events in Venezuela, Father Francis Scott’s soul is beyond saving.

If he’s damned, then he’s going to drag those who deserve it to Hell with him, starting with the men behind the horrible events of Stanmore Boys home. But as Francis searches for answers, it soon becomes clear some secrets will fight to stay dead. If Francis doesn’t stop stirring up old ghosts, he’ll be among them.
Overwhelmed, hunted, and afraid for his life, there’s only one place he can go, only one man he can turn to. The man of many sins, the man Francis killed for, the man who showed him what it means to be free. Vitari (Angel) Angelini.
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Vitari cannot afford to put a single step wrong. He just needs to keep his head down, and do what he’s good at—be L’ Angelo della Morte for his father.
He’s doing just fine until rumors of a contract reach him. The target? A priest. It can’t be Father Francis Scott. Francis is far away in England, safe from the mafia and protected by forces high above Vitari’s pay grade.
But too much from his time with Francis remains unanswered, and when it becomes clear the contract is for Francis’s life, Vitari must act.
He wasn’t supposed to see Francis again. What happened in Venezuela couldn’t follow them home, but now Francis is in Rome, exactly where he shouldn’t be, and the moment Vitari sees him again, he knows he’ll give up everything for Francis. Lose what’s left of his soul for him.
Die for him.
He’ll save Father Francis Scott, even if it ruins him.