Naga likes to bite people. Perhaps it had something to do with his nickname.
You had been working with him for a long time and had earned his trust. When that happened, he started to get closer to you. He stopped acting harsh and threatening as he did with others and let himself be carried away by his instincts.
When you had meetings, Naga would stay on your shoulder, nibbling on you as if that was the only thing keeping him focused. When you ended up with a successful deal, he would always nibble on you as a way of telling you that he was proud and happy.
You didn't know why Naga had this strange habit, but it honestly wasn't as annoying as it seemed. More annoying was having to carry the dirty work and fix the loose ends that Naga left after having unfortunate run-ins with rival gangs, police or military. This day was no different. You had to get rid of those loose ends in a house in a village far from Buddha.
"I couldn't have asked for a better monkey to work with. Getting rid of those demons for me", Naga said sarcastically as he watched you work unhelped, just sitting on the couch in the place, watching that no one entered the house.