My Sister found me my Wife

I'm now 37, my wife 35 and my sister is 34 and 8 years ago I was a quiet career orientated guy. Never dated and quite shy around nonfamily women, I'd done very well at university and had a great career ahead of me. My sister not as studied as myself had pursued other interests and had gotten pregnant and the father had left her to raise the child. Thus, my sister started living with me, maintaining my house. Our parents were unable to help her themselves as much as she would need. My niece was then 3 and I was quite willing to help them as much as I could. My sister soon started feeling sorry for me as she saw my life as a sad lonely life and decided to change my future as she foreseen it occurring. She started looking for a woman for me to marry and start a family, she found a woman who was quite like myself career orientated and a loner. She became her friend; it wasn't hard as they really got on very well. Overtime she introduced her to me, and we slowly got to know each other. So, I didn't get anxious around her or she around me. After a year we were comfortable enough to talk without my sister being present. My sister then got us drunk Christmas 2018, I awoke in my bed with my now wife beside me and we were both naked. It was then my sister came and asked the two lovebirds if we wanted any breakfast. My wife had been virgin and now wasn't and with her friend upset over losing her virginity in a drunken night she couldn't really remember all that much of. My sister told us both I'd proposed and my now wife had accepted, she added we'd just consummated the proposal. Anyway, it was too late as it was done and dusted, and we should not worry about what we had done but plan our wedding. After some time thinking it over, we agreed and were married 3 months later, and my wife was a pregnant bride. Now we've 3 children and my sister and niece still live with us and is our housekeeper/nanny. My sister has a sexual relationship with my wife and isn't dating anyone else, she is quite content with her life. My sister started her sexual relationship with my wife before we'd had first met and as I travel quite a lot. They keep each other happy and I'm just grateful to have a family and not looking at a lonely future anymore.