A mistake that I keep hammering on over and over again is the fact that you should never use your teeth during a blowjob. His penis is really sensitive and with the repetetive motion that you do during a blowjob, even the smallest graze quickly becomes a source of great discomfort.
The easiest way to rid yourself of this problem is just to tuck your teeth in under your lips. The problem is not to tuck them in, but rather to remember to keep them there during the whole blowjob. It’s easy to forget after a few moments why you’re doing it, but as with everything practice gives experience.
And I know some of you are going “But I’ve heard some guys like it when you use your teeth”. That’s a completely different thing; using your teeth as a conscious blowjob technique is definitely not the same thing as unconsciously grinding over his cock.
But more on this in the next post.