When I was 14 our family doctor diagnosed me with scoliosis. (curvature of the spine) I would need to be fitted with a brace and would have to wear it for two years. Being too inexperienced about the whole thing I was totally unaware of what I was getting into.
My Mom took me to the place were they manufacture the brace the next week. I was taken into a room and a lady technician greeted me and walked me through the process.
I was horrified when she said I was going to be naked while they made a plaster cast for me. No one had seen me naked in seven years! I asked my Mom to leave while they made the cast.
They gave me a sheer sleeveless t-shirt to put on and then she soaked it with warm water. She said this would keep the plaster from adhering to my skin. The wall I was facing was mirrors top to bottom.
I was not paying attention to my cock until she started to wet my shirt with the water and then I started to get firm. There wasn't any way I could stop it. The T-shirt covered my pubic hair but stopped at my penis. I was told to stay as still as I could while she rubbed the plaster into my shirt. She apologized about the plaster being so sloppy and kept a warm rag close by to wipe off the dripping plaster on my arms and legs.
She made no mention of my erection and was very matter of fact about it. All the while it kept getting harder and harder. The sensation of her rubbing the plaster around my butt was unbelievable. As she started rubbing the plaster into my chest I could see my penis in the mirror bobbing with every heartbeat. To keep the plaster from setting up on an unwanted area she would wipe my skin with that warm wash cloth. Some of the plaster dripped on my almost purple penis and she quickly wiped the spot before it would set up. As she started to rub the plaster around my pubic area she couldn't help an occasional contact with my penis. I masturbated for maybe 6 months before I was fitted with the brace and I was as hard as a rock. Men know this there is a point where it gets to its bursting point and you orgasm. My knees were feeling weak. I was in a huge plaster cast and I was hard beyond belief.
I was thinking to myself this is truly going to be the mother of all embracing moments. The lady was kneeling to my right as I began to ejaculate. The first two squirts were small followed by two huge ones that squirted out past the splatter mat I was standing on and had an amazing trajectory followed by two more small ones. I was looking at myself in the mirror beet red, in a cast, and still hard as a rock. The lady took the warm wash cloth wiped my penis and finished the job without saying a word.
I stood there while the cast set up and then she cut it off. Still an erection all the while.
At the time this was absolutely horrifying but I still get turned on when I re-live it.