I was babysitting for my best friend I had to look after her 6 year old son Ben and 10 year old daughter Lisa. The reason I had agreed to babysit was because I really liked Lisa in fact I to be honest I completely fancied her evrytime I set eyes on Lisa I developed a very stiff cock I was a bit shocked at first having to admit to myself that I had got a hard on when looking at a 10 year old schoolgirl but I quickly got over any bad feelings I might have had. Lisa was 4-10 tall slim with great legs and blond hair and Lisa's boobs were really budding too they were as big as half a tenis ball everyone could clearly see them and her nipples too. I had watched as Lisa was growing She had got bigger and bigger every week. Well as soon as Ben went to bed I started to work on Lisa and within an hour I had Lisa totally naked and I started having sex with her. I was babysitting and I had one of the babies sitting on my enormous erect cock