My first masturbation ejaculation was very intense I remember. I also remember not having any idea of what had happened due to lack of knowledge/education. It was also linked in with my young boy years of exposing myself/naked outdoors enjoyment.
I often went out for a bike ride of a summer evening on my own. Basically I was a perve at exposing myself to the fresh air at that age...I would walk with my dick out when doing my paper round when it was dark, I would pull my trousers+underwear down and walk through dark footpaths with my young ass+cock exposed feeling the fresh air blowing around them.
I was on a bike ride one summer evening, wearing jeans which I had undone the front buttons and let them slip down at the back to expose the top of my ass crack and I was riding along a country public road, if any car came up from behind it gave me such a rush knowing they would see the top of my ass! My cock was sticking out the front of my jeans and was intermittently hard. I recall being hard and as I was pedalling my bike my cock was rythmically rubbing against my jeans fly and it felt good. Then I remember feeling a 'MASSIVE' urge to pee, lol, so I recall stopping my bike and standing facing the hedge at the side of the road and stood with my sticking out erect young cock waiting to pee. Well..you can guess what comes next! Instead of pee, I had this intense feeling inside me, my cock twitched and white cum shot out. It was so intense it went so high in the air in several strong ropes, right over the hedge that was I reckon six feet above my head. I don't boast-it went flying!
I had no idea what had happened and felt guilty and worried all together. I was about 30 minutes ride from home still and I cycled home debating how to ask my mum what had happened or did I have to see the doctor? Because I would have had to explain the circumstances surrounding the 'white stuff coming out of the end of my willy/penis' I decided to say nothing.
Thereafter I learnt (self taught) masturbation and have enjoyed it so much since. In private and in outside similar situations.