After you've licked his shaft lots of times and it's all wet and hard, your man is going to start squirming with frustration if you don't start getting serious. A quick look up at his face will let you know when you're taking things too far. Teasing is great...to a point. A little experience in giving blowjobs will educate you as to just when that point has been reached.

On one of your upward swings with your tongue, from the base of his shaft to the rim of his knob, don't stop. Continue your long, wet lick over the top of his cock, lingering at the hole in the center. Stick your tongue into it, if you can, but don't suck the head yet. Now run your tongue around the rim of his knob, all the way around, making frequent passes on the tender skin directly facing you. This is where most men are the most sensitive, but not all men! That's one thing a good cock sucker has to learn to do, as soon as you're comfortable, that is. Ask questions. Each man is unique and so is his penis. Squeeze the shaft and see if some clear liquid pops up. If it does, dip your tongue into it and pull away. It will stretch with you and look fantastically erotic to your partner. Now, make like you love the stuff. Close in on that penis head like it was chocolate icecream and take the whole knob into your hot mouth. Hold it there.