In college I was with a girl in the bedroom of our apartment, and my roommate and his girlfriend came in. It was dark and the window unit AC was running, so they didn’t see us or hear us. We just laid pretty still and snuggled. In a few minutes I realized they were screwing, so I put it back in and quietly went back to work. When they finished, they both fell immediately asleep, so we sneaked out and I took her home. Next day I asked roommate if he knew we were over there, and he had no idea.