Sister joins me in my bed

I'm Keith 38 divorced 2 children both live with their mother. Last November I moved to another state for work and closer to my ex wife (now remarried) and my children. Not by design but the company I work closed my former workplace and I was transferred. It also put me closer to my sister Margret 36 single my only sibling. Margret works as an artist and does quite well in advertising and also selling some of her own personal works as well. I got my own 3 bedroom home as I get the children half the holidays. I settled in quickly, but not into dating at the time. Then there was a fire at the apartment building, Margret lived in. Her apartment was damaged by smoke and water and some minor fire damage as well. So she moved in with me until it was clear what was going to happen with her apartment building. It was really out of date in all areas and not of much historical importance either. Damage to a lot of the apartments in the building ended up with it being torn down a month later. As we were getting on good, there was no hurry for her to find another place quickly. Then Margret went to a business dinner and by the time she got home I was in bed asleep and she came into my bedroom and got into bed with me and started playing with my cock. I awoke and asked what was up and she said you are and I need fucking. I was still a little sleepy still and by the time I was fully awake she was sucking my now hard cock. I said we can't we're related and she kept sucking and I let her keep doing it. I blew my sperm into her mouth and she swallowed it all and went back to sucking my cock and got to harden up again. Then she got on top of me and inserted my cock into herself and started to ride me. I joined the fucking and after we had finished and she laid beside me. I asked why the sudden urge to fuck me, she replied she was horny and was hoping to get laid by someone after from the business dinner guests and all the singe males were either with their girlfriends or gay. So she had a few drinks and after got a taxi home and would have fucked the driver, but he was too old and might have had a heart attack if she had asked him for a fuck. She decided on entering the house to fuck me and so she got undressed and joined me my bed and we fucked. I just accepted that and had also started to get another rise so I asked did she want another fucking and she said yes. After we fucked again we both went to sleep and on waking in the morning I showered and was cooking breakfast, when Margret entered the kitchen still naked. I kissed her and laid her on the table and fucked her again, after which I had to recook the breakfast, as the previous breakfast was burnt while I fucked Margret. Sex became regular for us and she or I would start feeling up the other we would fuck. Margret moved into my bedroom with me. It's just mutual satisfaction the sex between us and we are still sleeping together most nights 7 months later, but still date other people and get sex from them as well.