In order to learn how to eat a girl out you need to understand few things. You need to understand the pleasure point in the women and then turn her on. In order to make you girl go crazy make use of your tongue and roll it all around her vagina just the way you lick a cream biscuits. She will love it. The most pleasure point is the clit so just roll your tongue in and out there. For more pleasure you can even stick the tongue inside her vagina and give her some more pleasure and keep teasing het. She will love it. You can also rub your hands all around her inner and outer thighs.