The Lucifer Entity by Zara Phanh

Leon “Stinger” Ortega is a secret agent who specializes in corporate warfare and espionage. Weathered, highly trained, and outfitted with a nanite technology that grants him accelerated healing abilities, there wasn’t a single mission he couldn’t accomplish.
Until, that is, he is tasked with protecting corporate asset Lucien Gerarchi, a musician adored across the world for his angelic voice and bewitching diamond-blue eyes.
Leon is quickly blindsided by the celebrity’s advances, and as events draw them closer, lines are blurred and boundaries are crossed until the men can no longer resist each other.
But in a world where only the strongest survive, love and loyalty are constantly being tested. No amount of training or experience could have prepared Leon for the moment he learns the truth behind their fatal attraction.