As a teenage boy i was like every other boy filled with hormones and constantly horny,i had just started masturbating and this took away some of my horniness.We lived pretty close to our school so i was able to come home for lunch, so a quick sandwich and a play with my hard cock,after a while my younger sister started to come home at the same time,i was 14 she was 13,this interrupted my fun as she unusually was outside my bedroom, i didnt know then that she was probably as horny as i was,she had already started growing tits and I'd had a few good looks when she wasn't paying any attention to me,eventually we would tease each other and end up wrestling around with one of us ending up on top of the other,i didn't mind letting her win as she ended on top of me straddling my hips and hard cock which would be against her knickers as her skirt rode up or i would have her face down and my hardon would be pressed hard up against her school skirt and soft ass crack,usually during our rolling around both our hands always found each others crotch or ass and i always managed to feel her 13 year old tits which she never stopped me from doing,knowing what i know now she probably loved a pair of hands on them even if it was her brothers.,i certainly loved it when she brushed her hand across my cock,sometimes she did it slowly so she got a good squeeze and feel of it.Eventually we had to go back to school so we both went into our separate bedrooms and i definitely had a wank to relieve my hardon and horniness i suspect she did the same then we went back to school,we both knew what we were doing but we never discussed it,i hope she thinks about now as an adult because i do.