Daughter-in-law

I used to work away a great deal a fly in fly out job. But while away working my wife and only child and his wife's parents all died in a multi-vehicle accident. A truck driver on drugs plowed thru theirs and other cars killing and injuring a lot of people, my wife and son and his in-law's car was the first hit, and the truck went over the top of them crushing the car flat. The death of my family and son's in-laws crushed me for quite a while, likewise my daughter-in-law. Selling up we both moved away as there were too many memories and started living together. After a year we were still grieving and hadn't moved on much at all. I'd a job locally at our new hometown and we kept ourselves mostly.
Another year or so later my daughter-in-law decided she wanted a family and wanted me to get her pregnant. Her stated reason was to have children connected to her late husband and as I was the closest match I was the person she chose. I was a little shocked but looking back not as much as I thought I should've been. I agreed as it would give a family again and I would get grandchildren in the future as well. She started sleeping with me and after a month or so she got pregnant. Now years later we've 4 children together and are still living and sleeping together. We're like a married couple but have never married. I'm quite happy with my lifestyle now and still miss my wife, my daughter-in-law misses my late son and her parents still as well.