I work security at a massive library for my university, 70 000 undergrads, it's a huge school. The library is 16 floors and open all night, and there are a million little rooms, nooks, and crannies, so many hiding spots. Us security joke around that if a homeless person wanted to crash in the library it would take us a week to find them, seriously.
Anyway, doing patrols during the overnight shift I often catch people fucking and sometimes masturbating. mostly guys, but yes, I have caught girls. I've walked in on girls sitting and leaning way back in their chair with a hand down their underwear and their faces beat red. It's fucking hot. I wish we had cameras in those rooms so I could know beforehand when there was a girl rubbing herself and stand outside the door to listen
