Drinking a man's piss from a bottle at work.
About 5-6 years ago, for several days I drank a bottle of a man's piss at my desk at work without ever knowing who he was or what his face looked like.
We started chatting on grindr, he had a faceless profile, I did not. He had a big fit build, and was into piss like I was. Eventually he convinced me, which was not that hard, that he would never show me his face, but he would start leaving Mtn Dew bottles (my suggestion for the green tinted so you couldn't tell what was in it) filled with his piss in a locker off the showers in the buildings bathroom. Then he would tell me, I would go in and get it, take it to my desk, horny and hard, and drink it at my desk and send him a picture or two. Did it a few times a week for a few weeks.
Was so hot to do it in public and also not know who he was or if I worked with him everyday.