I was 18 yo and she a little more than 16 yo .I founded old VHS amateur porn in the sleeping room of our parents .One hot summer Saturday we were alone at home and I said her : I must to show something. You can't never imagine how surprised was she when she have seen our father balls deep in our mom 7 months pregnant with her . After a little of persuasion and lot of kissing and fingering of her pussy she was ready to give off her virginity . First we had sex in missionary position and I came in her pussy after 10 minutes .Next round we took doggy and we watched the most hot part of VHS cassette : father doggy stile in mom .I came in sister pussy almost the same moment ,but she moaned much more than mom . She has now husband and three kids ,one daughter and two sons.Last time we had sex a day before her marriage.She was three months pregnant and almost certainly I'm father of her daughter Mary .