Family together again

I'm Daniel 47 younger of 2 children of Morgan and Joanna both deceased(the virus 2020) neither believed it was as bad as people said and found out to late it was. My sister Courtney 49 like me divorced and we both have 2 children each. Who maintain their our lives. I took a job well paid and moved to a rural location (2021)and got a 4 bed bed house and was settling in when I was called by Courtney. She had lost her job due to the business folding and knew of my new job and wondered if there was a job for her there. There wasn't a job at that time, but job open up on a regular basis. People move to the city more than the country, I told Courtney there wasn't one at the time. But will let her know as soon as one came up, she asked would I mind her come to stay and wait for a job with me. No your most welcome I said and she turned up 3 days later. I was still new in the area and with Courtney arrival, the locals put 2 and 2 together and got 44. Meaning they thought Courtney was my wife, which is probably understandably because she had reverted to her maiden name after the divorce. A week later she also got a job working at the place as me. As I said job become available fairly regularly, another thing I heard was we had 2 grown children. Courtney would someone and they would and she would say she had 2 grown children and I had mentioned I had 2 grown children. Thus reinforcing the belief we were married. People don't ask straight questions on meeting someone new, they usually work on the slow approach method. As not to appear too nosy and Courtney and I were invited to different things in community. But we finally became aware of their belief of us being married, went a wedding invitation arrive addressed to us both, the envelope Mr & Mrs J on it and on the invitation was Daniel & Courtney. We had a laugh and realized we were thought as married. We decided not to embarrass anyone over it at the wedding and leave it be as it suited us at the time neither wanting to start a relationship. At the wedding reception we pretended to be married and Courtney enjoyed the reception and that the would be Romeo's kept away the from married women. We did however drink a little much and got home a little too merry not really drunk and both in a party mood. I don't recall exactly how we start our sexual relationship. We were both a little shocked that we started having sex together. But it wasn't hurting anyone I said and Courtney agreed, so while still in the same bed together we decided to have one for the road and so we fucked again. Later that same day I was sitting watching sport and feeling horny and so I asked Courtney if she wanted to join me in my bed again. Fully expecting a no as a response, but she agreed and we had sex again. It was easier to keep sleeping together than in separate rooms, it might sound silly but we liked sleeping together and having sex together just made it better. No worries of babies and anything else. I had the house renovated adding extra space and adding another bathroom which was a Jack and Jill arrangement between the master and second bedrooms. Courtney used the second bedroom as a dressing room, except when her or my children visited she made out it was her bedroom. The bed in it only used for sex sometimes and she could sleep with and if needs be use the bathroom to go to the second bedroom. Three of our four children have visited and none noticed anything strange, they didn't visit us while we were in bed and waited for us to come to the kitchen in the morning. So we're quite happy with our sexual relationship and haven't lied to anyone, we haven't told anyone we're married. They just assume we are, we haven't corrected them, but that's an oversight we're prepared to live with.