We were hired

My sister Mary and I (Ruth) worked low paid jobs, and both came to the attention of our employer. He was 50+ and hadn't ever married, he had decided it was time to have his own family. Both Mary and I didn't date and were seen as plain and boring and not worth the trouble. With both parents passed away it was just the 2 of us, not well educated we had to get by working low paid jobs. It was because of our reputation and seen as not worth dating, attracted his attention. He used a chemical spill to get us medically checked over, the medical history form we had to fill out was very detailed. One question asked were sexually active with 2 boxes one was for yes, another no and according to which one you ticked another related one also had to be ticked. In our case we ticked no and answer a virgin or not question. We were both virgins and we didn't think anything odd about such a question on a medical history form. Then after the tests and everything was said to be fine, we got called to see the boss. He asked us both if we were interested in a better paying job and better place to live. We answered yes and gave the jobs of keeping his holiday house. It was in the country, and we would only have to keep his house and look after his needs. We accepted straight away, the following week he took us to his holiday house. He let us settle in for just over a month, then asked us would we have children for him. Shocked at first, but we'd become attached to our new jobs and asked if we could think it over for a day or so. He agreed, Mary 22 and 2 years younger than me wanted to accept as she saw it as a boost in our lives. I was a little wary but came around to agreeing myself. No prenup or contract signed, just changed our surnames and added each other's name our own name. I became Ruth Mary, and she became Ruth Mary no marriage involved, it was just to have the same name on the birth certificates. He took our virginity, always having sex in threesomes. Mary got pregnant first, but I soon followed. Mary had a daughter and I'd a son and I was worried he would get rid of us. But he has kept us and breed us to enlarge his family more. Twelve since we accepted his offer to have his children, and we've produced 7 children for him 5 girls 2 boys. He is still trying to add more. But it's been 2 years since the child was weened and neither of us has gotten pregnant again yet. But our lives are much better and we've no complaints about out decision.