I was 16 when one morning my sister was patiently waiting for me to leave the bathroom. I never imagined it but the house was very old and she took a curious glznce through the old,large keyhole as i exited the shower. She could not resist watching my bare body as i dried off everywhere. My bad luck was that as i rubbed my dick dry it started to grow and i decided to take care of it right in fronf of her vision. She didn't tell me about it for over 10 yrs when she was about 23 but when she did she thanked me for the show. She added that it was very educational.