Playing House

I'm Scott 24, the only son of Harry and Marie ( both now deceased) and have a sister Lacey 21. As we live on farm miles from anywhere, growing up Lacey and I kept each other entertained. I built a treehouse when I was 10 and Lacey would use it also. We played house there together up to the time she was 13 nothing sexual between us then. When I was 20 our parents died in a car accident and that left us alone on the farm. We carried on as before the accident and then 2 years later the government wanted our farm and others nearby to add to a military training area. We had no choice and had to move away to the other side of our local town. Were bought another farm to live on and continue farming, that this farm was slightly bigger it wasn't as good as our old farm. It had been let go and when the owner had passed away his family sold as fast as they could. We were there only a couple of weeks and still improving the buildings when a large thunderstorm came thru and dumped heavy rain on the area. We were stranded for 3 days till the water when down, unable to do much except feed our livestock and this meant that we were close together all the time. Lacey came out to the barn and caught me masturbating and she asked could she watch. I agreed, but I could concentrate on masturbating due to her watching me. I told her that and she asked me could she stroke my cock for me. I agreed and once she started to stroke my cock got harder again, I started to touch her and then she stopped stroking me and removed her top and bra to allow me to better access. Then she started again and I soon came. After that, I asked her could I suck her breasts and she said okay. This led to me kissing her and I put my hand under her dress and started to stroke her panties. She didn't object and when I tried to put my hand inside her panties. She said no not here, we should go inside and do that. So we left the barn and went inside, Lacey hadn't redressed and once in her room, she undressed completely. I started to kiss and feel her up again and I got another hard-on and I asked her could I fuck her. She said yes and that was the start of our sexual relationship, that was 4 months ago and Lacey got pregnant and she now wears our late mother's wedding rings. We sleep together every night now.