When I was a sophomore in college I was having a lot of sex with my boyfriend Bill at the time. My room mate Karla was also having a lot of sex with her boyfriend John. We both simultaneously decided to cool the sex with our boyfriends to gain some perspective on the relationships. While the sex stopped, our desire didn't.
One night lying in my bed I was having trouble sleeping. I was needing some relief, and looked over toward Karla's bed to see if she was sleeping. I saw that her knees were up and as I listened I could hear a constant rustling sound and the little wet smacking of a turned on pussy. I immediately put my hand in my panties and started to finger my clit. The thrill I felt from knowing Karla was fingering herself next to me gave me courage.
The window to our room had a streetlight that shone through it. I threw the covers back and let Karla see what I was doing. My hand working in my panties was quite visible in the glow of the street lamp. I saw her knees go wider and heard the smacking sound of her pussy get faster. My whole body tightened up as my climax hit me hard, but I was able to stifle the moan. Karla couldn't, although I will give her credit for trying. A stifled moan escaped her and both of us were breathing hard.
I drifted off to sleep feeling rather naughty. We never spoke of this to one another, although we had several repeat performances. She must have enjoyed getting off with me as much as I did with her, although someday I would like to find out more. That might be a story for another time.