When I was in college a bunch of us were invited to a friend's house for a New Years Eve party. Everyone was invited to stay over instead of drive home drunk. About half a dozen people stayed with the understanding that we would have to sleep on the thick-ply carpeted floor in the living room. We were pretty drunk and the carpet was very soft, so it was fine to stay.
Around 3AM I woke up to go to the bathroom. The room was dark except for a small night-light in the far end. I was about to move when I heard a slight moan. Looking over I saw Sylvia hovering over a sleeping Beth.
Sylvia and I had gone on a couple of dates and fooled around a little but that was all. She was a 20 year-old brunette with perky breasts and a nice ass. Beth, meanwhile was an average-looking 21 year-old with curly red hair and was a few pounds overweight. However, she did have a very sweet butt.
And now while Beth lay on her stomach, there was Sylvia actually leaning over with one hand holding Beth's skirt up as she peered underneath looking at that butt!