My favorite position to get oral sex is on my hands and knees. Something about a man bending his head to lap at my pussy from that angle is just so animalistic, it drives me nuts. It's also is a good position to have a finger inserted into my ass, which sends me over the edge.
If I am on my back being eaten, I like to have a pillow or two under my hips so my pelvis is raised up at an angle that makes it easy for my partner to lick and suck at my clitoris while using his fingers inside of my pussy and/or ass.
Another big turn on for me is if a man reaches up while he eats me and pinches and twists my nipples. YUM! | 
