Wetting my pants in public
When I was sixteen I was on a bus going home from a party the other side of town. I had had a lot of weak beer and was dying for the toilet, much to the amusement of the three friends who were with me. About five minutes before our stop I just could not wait any longer and I wet my pants thoroughly, pee running off the seat onto the bus floor and trickling everywhere. My friends rubbed me about it but as I walked home I realised that I had, in a strange way, enjoyed the experience.
I just could not stop thinking about it and wanted to repeat the experience. It wasn’t long before I started deliberately getting myself into a desperate situation, often on public transport. so that I would “have accident” again ( though not usually in the company of friends !)
So began a lifetime of wetting for pleasure in all sorts of situations including occasional bedwetting.