i say it is best to do it slow and steady at first until you get her worked up. I can give you some things that i DON'T like a guy to do, as well some DO's
When i get a guy who can do it just right for me, i can squirt and squirt until there is a huge puddle of cum lol. but there are few guys out there who have that much skill.
1. no teeth in any shape or form should make contact with the pussy lol
2. do not vacuum suck on the clit, that is extremely painful. I know men like suction but for me and my clitoris , please, no.
i do not mind telling a gent if he is being too rough on me. As i do not like pain at all, we are supposed to be experiencing pleasure.
i guess i can give a few DO's as well in my book
1. making contact with the clit with your tounge should be your main tactic. Make sure it is nice and slobbered up too, we like it slippery too.
2. light sucking while flicking at the same time, does me wonders. But not vacuum sucking, just enough pressure to make it stimulating.
3. fingering while licking is like double stimulation for me. Vaginal + Clitoral stimulation.
I hope i could give you a few more ideas to help you out down there,
.