Masturbated while my roommate was getting sucked at night after party

Has anyone had a similar experience ? My roommate brought a girl into the dorm late at night. I came a few moments before from the same party, drunk and horny I just went to bed with all my clothes on. After they arrived they started making out I was pretending to be asleep. It went on for a while and me being drunk means I get really horny. So i started touching myself slowly through the jeans. Then I heard how she was undoing his belt and unzipping his pants. She started sucking his cock. I started jerking off with my hand reaching into my jeans. The sounds she was making made my cock so hard I managed to cum inside my pants to her sucking his cock, because I didn´t want to get caught.