By now, your man will be hung between the absolute pleasure of you licking his most sensitive area and getting you to move along to the ultimate stimulation because he is dying to blow his load. Move over to one side of your partner (so that you are no longer between his legs) and take his shaft in your hand. Using your thumb and forefinger, form a ring that is about the diameter of your man's cock. Put the head of the penis in your mouth and position the ring from your thumb and forefinger immediately below the head (so that the ring is resting against your own lips). Now you are ready for the most pleasurable stage of the blowjob.
Take his cock deep into your mouth while sliding the ring of your thumb and forefinger down in a synchronized motion (always keeping this ring so that it is below your lips). While sliding down his shaft and then back up, use saliva to generously lube his hard-on and also the ring formed by your thumb and forefinger. Continue sliding up and down with your mouth and slowly tighten the ring of your fingers around his cock, still using lots of saliva. Your goal here is to turn your mouth into the tightest, wettest little pussy that your man has ever felt. The point of using your fingers in the shape of a ring and lots of saliva is so that you can apply more lubricated friction around his cock. A woman simply cannot create this sensation using just her mouth alone. And even if she tries, you risk unintentionally dragging your teeth across the shaft which is not exactly pleasurable.
As with most sexual touches, you will need to watch your partner to determine the exact pressure and rhythm that gets him off. Starting slow is always the best, but you should speed your stoking action up as you feel him becoming more excited. The depth can be varied as well; alternate taking his cock deep into your mouth and pushing the ring of your fingers far down on his shaft with periods of short, quick thrusts that just ride over the rim at the base of the head.
If the guy is really excited, he will help with a little humping action, giving you a hint at the rhythm that he desires. But don't let him have it entirely his way. If he is clearly begging to cum, slow it down, increase the pressure with the ring of your fingers and give him a few deep shaft strokes.
When you are finally ready to take his load, finish him off by continuing with the same lubricated mouth and finger ring action, speeding up the rate in rhythm with his hip motion (assuming he is really into it). The only remaining question is whether to spit or swallow. Crystal was a spitter, and did it in such an erotic way. She would spit my cum onto my belly, and then slowly rub her chin and cheek through it as she stared upward into my eyes. The sight of her staring at me lovingly while smearing my cum around her face was enough to make me squirt a few extra shots.
And that is it. Hope this is helpful to some lucky couple out there.