My wife surprised me

I'm Douglas 36 married 3 children, I run my own building company and live in a fair sized town well away from the city. My wife Susan 34 and answers to Suzie run the home and also does my bookwork. Last year in early October Tracey 37 Suzie cousin came to live with us and get away from the city. Tracey can work from home and left the as she felt lonely there, No problems we have a large house on a large block. Tracey is overweight and hadn't had many relationships and her and Suzie were best buddies growing up together. More like sisters then cousins, I started to notice them talking a lot and sometimes looking at me. But I didn't take all that much notice, then in late November with our children visiting my parents on their farm. Suzie and Tracey came to me and said they wanted to know if I would willing to get Tracey pregnant so she could have a baby before it was too late as her body clock was ticking. I was stunned at first and just managed a why me response. Suzie replied with your a good man and great father and it would give the child a father to go to if something happened to Tracey. With using I V F the child wouldn't know who their father was. I was still a bit shocked and unsure how to respond and Suzie added we could make it a threesome and we're all involved. I regularly got sex from Suzie, but the thought that if I was to refuse I might not as much for a while crossed my mind. But I soon dismissed it, I decided to say I would think it over and hoped it would be forgotten. But 2 days later I was asked again and decided to agreed, great was the response and they both wanted to start straight away and I wasn't really sure but decided to let them take the lead, so I laid on my back naked and both Suzie and Tracey done all the work and they got me hard and Tracey rode me until I came inside her and after a short rest they had me hard again and Suzie rode me for short time and then Tracey finished me off. That night I was used again and this time I left my sperm in Suzie. Now they are both pregnant and due in September. Up till March Tracey would join us for sex and Suzie has been the only one to continue sex since mainly blowjobs. The family was told Tracey had I V F and they had known she was thinking about it for some time. Nobody has remarked about Suzie also getting pregnant around the same time either.