Living with my aunt

I've never had sex or anything close with my aunt, but her horny friend well that's a totally different story. My aunt was 49 when she took me in, and I was 16. Her best friend was still married then and lived next door. I came to my aunt after the death of my father her brother, as my closest living relative. My mother having passed away a few years before my father. I wasn't a great student or sportsman either and kept to myself mostly. Leaving school to learn a trade and so I learnt plumbing. Then at the age of 19 my aunt's best lost her husband thru divorce, she got the house and alimony payments. But it affected her, she turned a bit strange and at first nothing happened between us. My aunt doesn't have children of her own but is godmother to daughter of another friend who had moved away years before. With that daughter then getting married she was invited and left to attend the wedding. I was home alone and that was when her friend came over late on that Friday night, the day my aunt left. I answered the door and she asked to come in, she already knew my aunt was away. She told she needed my help, and I asked what I could do to help her. Fuck me was her reply, I was shocked, but I still got aroused and well there wouldn't be a story if I didn't fuck her. Which I did and I really enjoyed my first ever fuck and of course we didn't top at one. It became normal for me to visit her, and she was always willing for sex. That continued for 2 years, then she met someone closer to her age and we stopped our relationship. She also sold up and moved away. New neighbors bought the place stayed a year than they too move away, I had some minor relationships nothing lasting very long. Then a mother and daughter bought the house and moved in. I became friends with both and started dating the daughter who was attending the university and we were getting on very well indeed. Having started a sexual relationship and it was progressing really well. I started to think of marriage between us. My aunt knew I was getting very serious with my girlfriend and gave me her blessing. My aunt when to visit her old friend for Christmas and the new year. I was staying behind and would celebrate with my girlfriend and her mother (widow). On New Year's Eve we partied hard, and all woke up together in the mother's bed. Everything was a little hazy, but it all came back slowly as the day progressed. We had all had a threesome and I had fucked both of them. I wasn't all that shocked neither were they, but I hadn't used condoms as I would've normally done with my girlfriend. Also, she wasn't on any protections either, no worries I was already thinking of marrying her. But her mother hadn't kept up her precautions either, I started thinking what could happen. Well, my girlfriend could get pregnant, and I was okay with that. Her mother could also get pregnant as well, a bit of a shock or only the mother could get pregnant. As well neither might get pregnant, as it turned out both got pregnant which made it easier, I think. I married my girlfriend, and her mother hid her pregnancy and when they were close, we went away on a holiday. Came back after births of the children, everyone thought without being told they were twins a boy and a girl. Only my aunt knows the truth besides me, my wife and mother-in-law. We added an extra room and my sold up and moved in with us. That was 5 years ago, and I now have 4 children 3 with my wife and just the one with her mother. We're all quite happy with how things are.