He shouldn't put so much stock into one thing as simple as wanting to please Faraday, but the truth is that Vasquez wants nothing more than to impress this man and he feels stupidly proud when he can make him say such things, touch him the way he does.

Sure, it's just a blowjob, but it's the first, and he wants Faraday to always remember this, so it needs to be so good. He keeps working him, getting his hand to work his balls, eager for Faraday to come and into his mouth.