My girlfriend and I had been going out for several weeks at the point when this happened.
After school I went to my girlfriends house and her parents were going out for the night so we hung out in her bedroom. We were kissing and I started to rub her breasts from under her shirt. I slowly took it off and she unzipped my pants. I did the same to her. She then grabbed my cock and started to stroke it while I rubbed her through her panties. We both took off our pants and underwear.
She started to stroke faster and faster. I inserted my finger into her pussy and started to finger her as she let out a moan. I then started to cum and let out five squirts of cum. She then started to lick some of it up which surprised me. My fingering got more aggressive and her moaning got louder and then she came.