First a new job, then married

I've been a loner most of my life and didn't mix with other people, I just didn't want too in the reason I suppose. Done well and got a great career and moved up the ladder fairly quickly. I finally made they say when I got promoted and got a PA, my PA was 54 unattached was all I knew. Anyway, I had to travel a fair amount in my new job and my PA was always with me. I used to get a massage most week even when I was away, at home I got them at my apartment. When I was away in my hotel room, my PA knew I got massages and said nothing to me about them. It wasn't any of her business as I paid for them myself and not by my expense account. But earlier this year, my luck ran out as I couldn't a massage where I was. No masseuse was available, I wasn't happy as I like a massage to unwind. My PA knew this by then and offered to give a massage herself, as it was my only option at the time I accepted. She was very good and so she became my masseuse when I was away on business. Nothing sexual happened until one day we had to stay an extra night to finish the business we were there to do. At dinner I asked was she willing to give a massage and she said yes, after dinner we went to my room and done as was now usual for us. For some reason I don't know I got a hard-on and my erect penis stuck out of my shorts. She saw it and just said she' take care of it after the massage was finished. I accepted that and she masturbated me after the massage, that was the full extent of our sexual interaction that time. But it became regular for me to an erection every time she gave me a massage. She would always take care of the erections, then one day she asked me would I like her to ride instead of masturbating me. I agreed and that was our first fuck which became the new normal. I was 36 at the time and was fucking my PA at least once a week, I finally asked her to move in with me. She said she couldn't as her daughter 32 wouldn't be able to afford the rent by herself. I told her daughter could also move it. Neither of them dated and I thought it was only right to have her stay with us. I would have her close by more often than visiting her daughter. My PA slept with me, and her daughter had the other room. On new year eve we all went and celebrated together and returned in a party mood from drinking. We partied in my bed and had a threesome, which also became quite regular. But the damage was already done new year eve as the got pregnant. I was really enjoying our relationship and married the daughter and now my wife gave me a son. Her mother is still my PA and still gives me massages and sleeps with us both. I'm up for promotion again and will keep my PA but will get a secretary/office manager and my wife is a secretary and she will get the job. The company has child minding and so our son will be close at all times.