I know there's something deeper about the psychology behind Pete and Vegas fake smiles to each other while Pete is following Vegas/while Pete is working for the Major family. That being said, it's just so funny how they mask themselves around each other but don’t really attempt to commit to the mask.
Because Vegas just sees Pete as a lap dog for the Major Family, and he knows Pete is smart enough to know when Vegas is faking his charm, so Vegas just puts on that friendly fake smile on and says the craziest shit like "lets make merits together so we can see each in the next life" to who, essentially, is just some guy that works for his cousins. The way Vegas offers him food and pats him on the shoulders or on the back with that fake nice smile while Pete sees through it and has to kind of play along with it, even though he looks cautious because it's all a façade and Vegas can turn into a psycho as quickly as he smiles.
AND PETE! Pete has a lot of qualities as a body guard but following people is not one and he just has to put on that goofy smile and play the subordinate knowing damn well Vegas is not a dumbass whenever Vegas catches him. And Vegas just puts an innocent naive mask and goes along with Pete, as if they're friends and the situation is so comfortable.
It's hilarious. It’s peak comedy. It's everything I needed.





