Another time that my then GF and I went to a hotel swing party there was nothing much going on at first, so I went down to the hotel bar and had a Corona. I gve it about 25 minutes, and then I went back upstairs in the elevator. I showed my wristband (one of those paper things that you have to cut off) at the door and got back in. There were a few more people there now. It was a suite, so I went to 2 rooms looking for my GF ... I didn't see her, though I did stop to watch one older silver-haired woman on one of the beds fucking one guy missionary while another guy was jerking it less than an inch above her face.
I finally spotted her in an area where they had a desk with bottles of water on it and an open laptop. She was on her knees, her back completely to me and didn't know that I was there. She was blowing a really fat naked older guy who was sprawled out, sitting in the office chair. Her hair was back in a ponytail, and her head was bobbing back and forth and up and down. I stood there and watched for a bit and could hear the slurping/sucking sounds, although it was difficult because other women were moaning loudly from other rooms, and people kept calling the organizers to find out what room we were in.
So, after a little bit, I heard my GF make "closed lipped sounds of agreement", like "mmm hmmm ... mmm hmmm", and I realized that she had sucked him off and he had started cumming. That's when the fat guy lurched forward in his chair, grunting and groaning loudly while holding the back of her head at the base of her ponytail. I have to hand it to her, she stayed on her knees and gave him 2 more had sucks to get the rest of his cum out.
When she got to her feet, she saw me standing there out of the corner of her eye. As she walked over to me, I could see that the right side of her mouth, her bottom lip, and her chin were glazed in sperm and some was dripping from her chin onto her tits. She hugged me and sheepishly said, "I tasted him, I drank every last drop of him." I kissed her and smaked her butt as she continued on to the bathroom to clean up.
I still have no idea who the fat guy is. We never saw him again, and she never got his name.