Growing up in Halifax in the 50's
When I was about 11 I got a step-sister. I only found out the truth about the entire situation later but it seems my father had a woman on the side for many years, before and after he married my mom. She died and this girl had nowhere to go and ended living with us for three years.
She was a year younger than me and very skinny. We got along fine, as kids will do at that age even though the situation put a lot of stress on my parent's marriage.
I don't recall just how it began but we developed a thing where she would jerk me off anytime I asked her to. Most times e would sit side by side on the bed, after school, and she would open my fly, take out my penis and masturbate me. When this began I did not ejaculate but could later. The first few times I noticed some semen but it was not very much. The first time I really shot some semen we were both surprised by what had happened.
I used to put my hands under her skirt and touch her but she did not like me to go under her knickers.
As she got older and more developed that changed and she allowed me to finger her after she had jerked me off.
We almost never took our clothes off but one time we did and I lay on top of her and rubbed myself between her legs feeling the wetness of her sex before coming on her leg.
After living with us for three years, her father tracked her down and took my parents to court and she had to go and live with him.
I saw her about 10 years later at a wedding for someone we both knew. She was there with her husband and a new baby. We spoke for a moment and as I was saying good-bye she whispered under her breath 'I still think of those afternoons'.