When I was in my teens, my mom, brother & step-dad lived in a huge old house in downtown Toronto we rented from someone in my step-dads family. It had been a dentists office and the ground floor had been cut up into offices. We lived on the second floor. My mom gave room and board to students sometimes for extra money.
One weekend morning, my mom asked me to go downstairs and ask the boarder if he wanted to have breakfast.
I went downstairs and into his room. There was no door, just a partition between the office where he kept his books and the space where the bed was. When I got there he was sleeping on his side facing away from me but just when I was about to call his name he rolled over onto his back. He had a morning erection sticking out from his pajama pants. I did not say anything but just stood there.
His large and thick penis slowly stiffened and moved by itself to align with his body. He reached down and scratched his balls, then took his penis in his hand and pulled his foreskin back revealing the head which was red-purple colour. Although I was then a virgin at the time; I had seen and touched a boy's penis before but never one this big or that was erect like this.
He began to pull and tug at the tip and roll the foreskin back over the head with his thumb and finger. Within a minute he had come and ejaculated a large blob of semen onto his belly. He sat up for a second, opened his eyes for the first time and with a smile, wiped the cum off with the corner of the sheet. He then rolled over onto his belly and went back to sleep.
I went back upstairs into my room and was trying to decide if I should masturbate right there or go into the bathroom when my mom called me to breakfast again. She was a bit annoyed that I had not woken the boy up for breakfast and stomped downstairs to do it herself.
The three of us ate breakfast but I could not stop thinking about his penis and what I had just seen.