I went to a gloryhole with some girlfriends. They had specific areas for different purposes and and we were set up giving blowjobs. After about an hour, I was super turned on and wanted more, so when the next guy stuck his cock through, I moved a table over, braced myself against it, and backed up so his cock slid into my pussy. I could tell he was surprised, since this part of the gloryhole was specifically for bjs, but he got super into it and pounded away until he came in me.
10/10 would do again.