The office cleaner

I'm Bernard married 3 children and partner in a business, the business owns a 2 story office building and our uses the whole building. I was bored with everything earlier this year, my wife Kathy was away visiting her parents with the children. I had to stay as I was finishing a project and so was home alone. I was staying back after everyone else having finished for the day. The cleaner came in around 6pm and started her work, she usually took 3 hours to do the whole place. Mary 59 is slender and good looking for her age and I had finished my work and was sitting thinking what I could do watching her working. I was surprised I got a hard-on watching Mary bending over, but never one to take a backward step decided to see if she would let me fuck her. I walked up to her and straight asked her for sex. She was shocked at first saying no and then started saying she really needed the job. With me just looking at her, she finally decided to let me fuck her. I could see she was scared of losing her job and told her she would lose her job, if she refused me. But she said she would still have sex with me and so we did. I really enjoyed fucking her and I stayed back every night until Kathy and the children returned fucking most nights. After my family returned I would go and visit Mary at her place and found her living in a rundown old place and she paying far too much rent for the dump. I had a old place myself I had inherited years earlier and it was empty and in better condition to Mary's place. I told her she could moved in to my place rent free and helped her move her few things and bought other things she might need. The place is a lot closer to my home and I can visit Mary anytime for sex. Last June our company had the building bought by the government for road expansion. We got a great deal and we relocated to another building and Mary wasn't required to clean at the new place a s it had a cleaning company contracted to do it. But not wanting to lose Mary, I asked Kathy about us employing her to clean our house. Kathy agreed and as Mary lived close by, Kathy also started to use her to babysit the children as well. Then in late July Kathy went away with the children to visit parents again as her mother was ill. Leaving me again and I started staying home and working from there while she away and fucked Mary in every room of my house. On Kathy return she told me that she was having morning sickness and had to get tested and it was confirmed she was pregnant again. Kathy started to suggest that Mary move in with us and become a fulltime housekeeper. I tried to resist at first, but Kathy than told me I could still fuck Mary as I wanted. I gave her a shocked look and she explained that she had also took a fancy to Mary and had a little fling with her as well and Mary had told her about me fucking her. Kathy doesn't see Mary as a rival and says she is happy to let me continue to fuck her. So Mary moved in late last month and spend the first night in bed with me and Kathy. Mary is very willing to us both and is going on holidays with us and children next November. Mary is our housekeeper, nanny and lover all rolled into one.