Family Friend

I have been a family friend of Karen's family, as far back as I can remember. There's only 2 years different between us. I was best friends with her older brother Luke and got on well with the whole family. I'm divorced with 2 young children, my ex wife Donna couldn't settle into family life. Always wanting to go out and party and after our second child was born. She just packed up and left me with the 2 children and went back to her old ways. She has never asked or enquired in any way about the children since she left and didn't want anything from me in the divorce. We lived across the the from Karen and Richard and 3 children. Richard got sick with cancer and died 18 months later and Karen was left with the children and the bank taking the house. I have a 5 bedroom, 3 bathroom house and offered her a home. Her Parents are retired and in a retirement village and no room for her and the children. Richard's parents were the same, Luke was killed on military service 5 years before Richard passed away. I let Karen run the house which I had been gifted by my parents on my wedding day. It's fully paid for and I work as a accountant for a national company. With Karen looking after the house and all the children, we had a good arrangement. I paid her for this and she also got house keeping and money for extra's. I got a second car for her and we lived like this for 2 years after Richard death. Back in May on a weekend, we all went to the movies. Then the Zoo, it was a day out for treat as I had been promoted and this was a celebration. I enjoyed being with Karen and later that night after the children were in asleep, we were watching TV together. I just leaned over to her and kissed her. She pulled away and said Why did you do that, I replied I couldn't resist. She then said I don't want to be a one night stand and if you want me, must take the children as well. I will take you and the children and whatever else you want. I also want you to marry me and we slept together since that night and are getting married next month.