This happened when I was fifteen.
I lived in a house next door to the school that I attended. My mum was a teacher at the school. We had lived there since before I was born.
This happened when I was on the summer holidays. One day I was with my mum in the garden and we saw a lorry delivering boxes to the school and sitting them at the front entrance. A short time later the school janitor came over and asked if I could help him open the boxes and take the contents into the storeroom as this was new textbooks and stationery. My mum said I would be glad to help, nothing beats getting volunteered.
After about an hour and a half we had it all finished and the place locked up. The janitor said for me to go to his house to get cleaned up, his house was in the school grounds. We went in and washed our hands and he asked if I would like a cold drink and I said sure. So he got the drinks and sat talking, he said his wife was away shopping.
After a while he asked me if I masterbated and I said yes every day. He asked me if I had done it with anyone and I said yes with a couple of friends. He then said had I ever seen a man's dick and I said no, it was true. He then loosened his trousers and took them down followed by his underpants. He stepped out of them and as he then took off his shirt I could see his dick hanging there and saw that he was very hairy. He now stood in front of me totaly nude.
He said I should strip, and I was getting horny so I took off my t-shirt shorts and underpants and stood there naked for him. He started to play with my dick which was already getting stiff.
He gripped my dick and proceeded to give me a wank and after about five minutes I could hold on no longer and spurted all over but he kept going till every drop had cum. We changed places and when he lay back I could now see his dick was about seven inches and really thick. He told me to give him a wank and soon I was pumping away till a good five minutes later he also came all over.
I stayed there for another hour and we did it again and we both came again. He said his wife would be home soon and we got cleaned up and dressed. This was my first time with an older man and it was great. We did this quite a few times and it was always fun.