I never thought about techniques for it, it's so delicious you just know how to automatically. Main thing is not rushing or 'eating' at it, because this does not feel good to the suckee and teeth have to always be kept tucked well under lips. Other than that, you can even talk about, say, if your sucked dick wants to tell you to let him fuck your face awhile instead of you applying so much pressure. Lots of people don't do it well, though, I admit. The really good cocksuckers are almost as hard to find as the truly pliant and welcoming assholes who know how to open up their gorgeous man-asses to worship your fuckin' dick.