I went through a situation like that when I was about 12. I was helping a neighbor in their tobacco field. As we started very early I stayed at their house. I had to sleep with their 19 year old son. Needless to say we jacked one night and he was very interested in seeing my cock. Fully erect It was about 9.5 to 10 inches long and extremely thick. He was mesmerised by the sheer size of it. We jacked every night for almost 2 weeks but after the first night all I had to do was lay there and enjoy he hand on my dick.