But after getting to my car and driving off, I realised that the homework I had wanted to mark was still in the desk drawer: I had forgotten it. So I turned around, drove back, and went back into the building. So I entered the classroom unseen, and was about to retrieve the homework when I decided that the peace and solitude of that classroom made it ideal for me to do the marking there. I knew where the emergency key was kept in case I got locked in so there was no potential problem.
As I set to work, with no panties on, I became increasingly aware of the growing need in my bladder.