Don't be afraid to ASK how he likes it as you are working it. It's the same principle just like getting girls off, what works for one guy, will not work for another guy. And a combination of experience too. I've only met one girl who knew how to work "the magic spot" so well, she knew exactly how to unlock my body to get her tasty treat! I attribute that to her experience.
Keep in mind too, the penis was meant for a vagina. Inside the vagina, it's soft, wet and just a little snug around the cock. Don't work the cock hard like a whack-a-mole game, do not use the teeth, no need to imitate what you see in porn, because porn is fake. You can get your treat simply by using the tip of your tongue on that hot spot of the cock. Lips and tongue contact action is all that is required