This happened last year, when I was a freshman in college.
One night, I was in bed, feeling really horny. My roommate was in her bed, sleeping, so quietly, I slipped my hand into my panties and started to rub my clit. It felt so good that I forgot to be quiet and started to moan. I didn't even notice my roommate get out of her own bed and come to stand next to mine. Then she asked me if she could help. I nodded, and she pulled the sheets off of me and then pulled down my panties. She kneeled between my legs and brought her face down to my pussy. Then she began to lick. This was my first time ever having someone lick me there and it felt amazing. As she licked my clit, she pushed some of her fingers inside of me. Pretty soon I was thrusting my pussy up to meet her tongue and moaning loudly, quickly I had an amazing orgasm. Of course, I returned the favor, and we had many other experiences together throughout the rest of the year.