Loved every lap I've ever had the pleasure of being in, and teasing my way up and down her inner thighs helps build the sensation, lightly trailing the tip of your tongue along and around her outter lips till they get thick and "bloom" open. Gradually in circular licking till her clit swells and pushes out from under her hood to get tickled by the tip of your tongue, then curl your tongue up and lightly suck on it like a cock. reaching your tongue "under" her clit to poke inside her pussy and try to get as far inside and up toward her bellybutton and pull your tongue against the inside of her pussy as your slip your tongue out. None of this should be in ANY way rushed , the longer the better and the more often you do it the stronger and more agile your tongue gets ;)
The very best experience can be had when there is "communication" between the lovers, and she can "tell" you what feels good, what to do, and how good you're doing it ;) "Talk Dirty" dammit! So, I know you're not just there to watch!
I'll just keep practicin' whenever I get the chance ;)