You actually do both, you can also put in a bit of fingering while you do it.
Basically, just experiment with it.
The only way you will get good, is from experience. But for your first time i would
watch some porn to see how other people do it.
Above her hole, at the top of her labia is the clitoris. It is often covered by a little hood and it can vary in size from that od a small lentil to a pea. With very many women, maybe as much as half, stimulating this "bean" is the only way they can have an orgasm.
You can kiss it, lick it, caress it, blow it, gently suck it, slurp it, tenderly nibble on it, do what ever gets a reaction. Experiment, keep it moist, communicate with her and ask her if what you are doing feels good because it wont necessarily be the same for all women. Practice makes perfect.
I recommend flicking it with your tongue, it drives women wild. Don't just concentrate on her clit either. For you licking and sucking on her labia (the plump juicy lips) is more enjoyable and she will love it to, providing you are gentle. How gentle depends on the girl, some like it quite firm. Use your fingers too, you can lick at her hole a little and taste her juice, but once you are getting her really worked up insert your fingers in her hole and caress her G-spot (if you know where it is).
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