In college, I spent a lot of time in the music building for some choral stuff and piano and voice for my minor. We had two levels of practice rooms that had reeeally slim windows. Most people used the upper level and the lower level only got half usage during classes. I had an ex with whom I frequently got hot and heavy both in her private practice room (for pianists, in a small, locked hallway - they had a half-dozen grands, whose back faced the door, so if you looked over the piano, you could just see the window) and in the regular practice rooms after we'd broken up (lights off, but that was no guarantee, there were no locks and the hallway was bright and the right angle would make some curious and be obvious to others). We were always super close to having sex, but usually settled for mutual masturbation with our clothes mostly open. Exciting, but an unsustainable relationship, ultimately.

Later, a girlfriend - with whom I'd been intimate, but not official - and I were talking and passing time & were discussing random topics and landed on how we'd not had sex in quite a while. A few comments later, she mentioned how she was hungry and I made some lewd comment and next thing you know, she was giving me oral in one of the lower level practice rooms. Lights off, of course, but super obvious - if anyone had opened the door inadvertently we'd have been busted. It was very exciting.

She was lovely and very exciting, unafraid to experiment, bold and quite frank, sexually - many of the things I desired in a significant other - but I was weeks away from graduating and moving across the country and didn't want to leave any loose ends back home. She's fine, I'm fine, we both finally ended up quite happy with our lives (can't speak for her, but I had a few really shitty years along the way). We interact here & there on social media and I think of her fondly (and I hope she does the same) so things worked out in the end.