The Biology of Music - I fucked my trans substitute teacher

I was never strong in school. I wasn't very interested in what we were being taught, and the teachers liked me enough to not give me too hard a time about it. I attended an all boys school. It was actually quite a religious school which makes this story all the more surprising. I was in the middle class - not very stupid, but not going to win any Nobel prizes. Largely we had male teachers because it was a difficult environment for a female teacher.

When I was in my last year of school, our biology teacher was out sick and we had a substitute. Either the school was desperate or she was, but it was a female substitute teacher which was a rareity. I didn't pay much attention to her initially because I just saw her as another teacher, but once she had taken off her coat, I noticed that she was wearing tights and quite a short skirt. She had long brown hair in a pony tail and was quite tanned. She had our attention.

I noted that she was quite flat chested, but as a horny teenager in an all boys school, this was not a deal breaker. She was a fit woman in her 20s and many of us were masturbating three times a day. It was a dangerous combination. She began looking through the book to find where we were, and then went to the board to write something about plant anatomy or similar. Her butt was clearly perky and the short cotton skirt barely contained it.

Naturally I had an erection. Using my thumb, I casually moved my erect penis toward my hip, like I was scratching an itch, so as to give it some room to breathe. That movement of my penis though did not make me any less horny, and I wondered if I could get away with maybe touching it again. Maybe touching it through my pocket. I was on a seat on my own at the side of the room next to the radiators, and I was able to lean back with my hand in my pocket as if I was in a relaxed pose listening to her tell us about stymens.

The more I surreptitiously touched my penis through my pocket, the more I began to realise, 'I am about to have a wank in school'. I had heard about students doing it, but I never thought I would actually go through with it. I started rubbing my penis head, slipping my foreskin back and forth over it. It felt amazing, because it was naughty, risky, and I was watching a very sexy teacher at the head of the class.