Pure Evil by Loki Renard

Get on your knees and pray.
Crime lord Angelo Vitali has been at the top of his dark and twisted game for decades. He is a seducer of men and a breaker of souls. Those who come into his orbit find themselves not just taken, but owned.
Angelo makes a mockery of the lawful and the lawless alike. He can’t be defeated by conventional means. Even the FBI can’t touch him – but there are people in the world who play by the same set of rules he does: anything goes.
And they’ve picked a champion.
Damien Colt is an ex-marine and mercenary for hire. If anyone can take Angelo Vitali down, it’s him. He’s younger, stronger, and he has the complete backing of some very influential people. He’s been sent not just to kill Angelo, but to make him pay for each and every one of his sins before he dies.