Sucking and licking, when done correctly, can drive any girl wild. Be careful with biting, you can hurt someone with sensitive skin. Squeezing and twiddling are NOT GOOD.

It hurts. Gently rubbing your thumbs can do something, but using your mouth does more.
Another good erogenous zone: earlobes. Gently suck or bite (applying a small amount of pressure with your teeth) Right along the bottom works for me, but other girls could be different.