Take one of her nipples in your mouth and play long enough for we to really start enjoying herself and then....STOP.
If you give away all the pleasure at once...she won't crave it...remember that :)
Now starting with her thighs make her
Go crazy. Massage, lick whatever makes her go crazy (experiment!) But don't go near her clot or pussy.
Once she really gets built up its fun to work your way from thigh right up her leg and then massage her hips while lightly reason her outer pussy lips wih your tongue. Lick along the edges as close as you can without getting your tongue to her inner area. It will drive her absolutely crazy. Do this until she's losing it...
Now ask her how badly she wants you to make her cum. Have fun with this
And keep making her say it. Ask her what she would do for it.
When she gets to the point where he says "anything" now you can have fun :)