Making Babies

I'm David 34 and my Sister Robyn 36 both lawyers and single and little overweight. We were both orphan at an early age, we were put into care of a lawyer and his wife both over 50. Neither of us had much luck finding partners. So as Robyn said Her Clock was ticking and she wanted to have children. We both worked on sex case together, Robyn was the lead. The involved incest and children had been born as result. No health concerns due incest and the father was the father to his daughters two children. He got convicted mainly because the daughter was underage at the time. On the weekend at my condo Robyn had come over to see me, she had been thinking about the case we had just finished. As our adopted parents were now both deceased and no family that we know of. Robyn asked me straight out about fathering her child, I was shocked and a bit excited at the same time. Not many people know where related. Also we had our own law practice and of the 2 staff, I was retiring and the other was leaving soon to return home. So Robyn said As far as anyone we hire knows we can be husband and wife. Then asked me What did I think, I was still a bit taken aback. All I said at first We'll have to live together. Of course she replied, I then said my place is 2 bedroom and yours is 1 bedroom. Not here, we will buy a place together somewhere else she said. Okay and when do you want to start I asked. No time like the present and she walk up to me and grabbed my cock thru my pants. I started to get hard as we walked to my bed. We had sex twice that day and she started to live with me straight away. Her place sold almost straight away, mine took a month longer but got about asking price as there was a lot of interest in it. Robyn found a 3 bedroom apartment and we purchased it, it need a lot of work and we to shower at our offices for a coupler of weeks. By the time the apartment was ready Robyn was pregnant and I asked Would we be having sex still or is it out of the question now. I can't see why not, I enjoy our fucking She answered. As the time of the birth got closer, we stopped intercourse and Robyn would give a blowjob or pull me off. I still gave her oral and knew from prenatal test there were no problems with the babies. Robyn was having twins and I asked her How many she wanted. Four she said and after the birth we were very happy and Robyn takes them to the office with her every work day and we're now back having sex with no protection and when she stops breast feeding she will try to get pregnant again.