I accidentally discovered a way of almost getting off when I was a teenager at school in the north of England. It started shortly after I moved up to a girls' grammar school and couldn't bring myself to use the school toilets which were cold, dirty and full of predatory older girls.
After my first experience of being forced to finger an older girl's cunt during lunch break I started to do what my mother later described as 'holding it in', in other words I retained my urine. By the time I was going home in the afternoon the pressure in my bladder was considerable, and at times painful, but I also found that holding it in and squeezing my thighs together in an effort not to piss myself would put pressure on my clit.
Sometimes it would build up to the point where I would just make it to the loo when I got home and would tear my knickers down and enjoy the release of my pee while stroking my clit through the hot stream of piss. Unfortunately I used to leak sometimes and I would get home smelling of urine from a day's worth of leaked pee and the heat of my crossed legs.
To this day I'm not sure if my mother had worked out what I was doing as she always seemed sceptical of my excuse about my disgust at the state of the school loo's stopping me from peeing during the day.
After leaving school I found easier and less anti-social ways to wank, but in my late twenties I enjoyed a relationship for a couple of years with a man who liked to be pissed on so I could indulge my adolescent pleasure in 'holding it in' again.
Any other girls out there who have used a full bladder to get themselves off?