My first sexual experience was with a best friend’s older brother.

He took a curious liking to me (which was to be expected, as I looked somewhat feminine in those days - long hair, and a slight build.)
When the opportunity soon arose when we could be alone, he would coax me into a far corner of his cellar and take out his cock.
At first, it was all innocent fun, as I really didn’t know what to do, or why he was showing himself to me in the first place.
This progressed to us continuing these games, but in outdoor locations, usually in the swamps where we lived, where no one could see us.

I remember one time in particular, when he took out his cock in an empty garage, and it was larger than I had ever seen it - all swollen and pulsing.
He told me to put my hand on it, and I remember it was very warm - almost hot to the touch.
It didn’t go much further than that, at least that time.

When I look back at those times, I realize his cock is the one I compare all others to, as it was the first one I saw in person.
It was nicely formed, with a pronounced head, and tufts of jet black hair at the base.

The last time I remember was when we were back in his cellar, when he told me to take off my pants and face away from him.
I did so, but only after making him promise he would do me a favor in return (but to this day, can’t remember just what that was.)
I remember facing a concrete wall with small windows towards the top, when I felt him stand behind me.
A few seconds later, I sensed his hard cock between my legs.
It was a nice feeling - the silky feel of the skin of his cock, along with the warmth between my legs.
Without any words, he started to move in and out, again and again, with a steady rhythm.
He told me to go along with the movements and match his.
I started to obey him, and noticed his movements got more aggressive.
We stood like this for a few minutes, with me not knowing what this would culminate in.
I would soon have my first experience with a man’s sperm.

I was too young to have known myself, as I didn’t yet masturbate, but soon I heard him tell me, between a whisper and a moan, to keep moving faster and faster.
I felt him lean back, away from me, and moan quite loudly, as I saw fluid shoot from underneath me, and arc into the air, making wet marks on the dry cellar floor.
I still didn’t know what this was, and I didn’t have the time to find out, at least this time.

As fate would have it, I looked up and saw someone’s feet quickly walking along the sidewalk towards the rear sliding doors where we were.
I yelled out, and both of us grabbed our pants and pulled them up and moved into opposite sides of the room.

Good thing, as it was his older brother, who could be quite mean in certain circumstances.
Who knows what him finding out what we were doing would have resulted in?

Our secret was ours, at least for the time being.