My best friend and I went bar hopping one night. He had a steady girlfriend at the time and told her to meet us at a club for last call. I suggested we head back to my apartment and continue to party, not thinking anything of it. I grabbed a few drinks, he had some smoke and we were chilling just watching some tv. She was sitting in the middle of us. My buddy was stoned at this point and I was pretty drunk myself. Out of nowhere, his girlfriend who I had never met before, started rubbing my thigh. It took me a minute to realize what was happening before she starting rubbing my cock through my pants. I was shocked and honestly just froze. Is she so drunk that she thinks I’m him? She unzipped my pants and starting sucking my cock right there beside him. He was so stoned, didn’t notice until I snapped my fingers to get his attention. He just stared at us, and feeling awkward, I asked him if he wanted to get behind her. My buddy then gets her on all fours and starts to fuck her doggy style, while she continued to suck me off. This lasted for maybe 5 minutes and he said he had to go to the bathroom. He seems to be gone a lot longer than 5 minutes so in the heat of passion I fuck her every which way. When he finally comes back to the room, she’s riding me hard while I am grabbing her ass. He just stands there with a blank look on his face. She cums real hard and grinds on me while moaning loudly and then collapses on me. We lay there for a minute. She gets up And dressed. They both leave. A week passes and I call him to see what’s up for the weekend and I can tell he’s acting different. I try to plead my case and say that she initiated it, and if you wanted her to stop you should have said something. Months pass and it’s obvious my buddy I’ve had since high school is distant. Fast forward a few years and I talk to him once in a while now and always have to make the call. I do have some regrets, but also remember that crazy night fondly and glad I was able to have a threesome. Fucked up thing is if that never happened, he may have married her because they were pretty serious after the incident for a few years, but eventually parted.