when I was about 13 I used to play doctors with my 2 younger sisters this would involve them laying on my bed to be examined Jane was 11 and Susan 9 I would pull their dresses up take down their knickers then tell them doctor wanted to feel their noo noo (as they called their pussy)they would both giggle as I touched their little pussy lips,then I would say look doctors willy has gone all stiff,take my cock out and they would take turns playing with it,I would then get them to turn over and lift their bottoms up and I would finger each of them while rubbing myself,they would laugh and giggle as my sperm would land on their up turned bottoms.This went on for about 2 years then I started to go out with girls,nothing has ever been mentioned about our little games and they are both happily married but I often wonder if they ever think about their big brothers willy,