I was at a bar with my girlfriend (at the time) and they had a club downstairs that we didn’t even know about. We could hear the music that started around 9:00pm and noticed the bar had cleared out a bit which was surprising for a Saturday night in the summer. We found the stairs and made our way down. We had a few drinks downstairs (after having a few upstairs) and then made our way to the dance floor. My girlfriend and I had a very sexually charged day between our time at the beach teasing each other and her wearing a short skirt with no underwear the rest of the day. I remember I was dancing and looking around because my girlfriend kept bending over and I wanted to see how many other people were looking and getting to see up her skirt which would definitely show her ass and maybe even her pussy. Well one of the times she bent over I was looking and didn’t notice she was unzipping my fly and pulling my cock out (I don’t wear underwear so it was fairly easy). While bent over she placed it in her mouth and then gave it a good licking before putting it back in my shorts but not zipping my fly. I was in shock, I could not believe it. I made sure I zipped up and did my best to hide my hard-on until it went down. We ended up having incredible sex that night at the hotel we were staying at and I often brought this up to her because I found it so surprising (and hot).