My Sister Susan seduced me

I'm Ralph 32 single an have 1 child Andrew 3, his mother is my sister Susan 30. I could say its all the pandemics fault, but as Andrew was born June 2019. That's not true, Susan finished university and wanted a good place to live in the city. That's where I came in I had a great apartment at the time and so she came to stay with me her nerdy brother. I've a great job in software development and have now bought my own house for Susan, Andrew and me. After she moved in she got a job, but it didn't last long, the next was similar and so was the next. She got a job and then the business would either be bought or reorganize itself and last on were first off. On my birthday 2018 she decided to get me laid as I was still a virgin, but couldn't afford a hooker or had a friend who would do her such a favor and as fuck her brother. So she decided to do it herself, she was careful and she got me laid as she called it the time. Of course I liked it and wanted more and due to lack of employment she would sleep with me often. Then on her birthday we fucked several times as I gave her a great birthday present. We messed up once or maybe twice that day or maybe the next and Susan got pregnant. After tested showed the baby healthy she decided to keep the baby. As for our parents our mother has accepted our relationship and loves her grandson Andrew and is moving to live with us shortly. Our father, well he doesn't know and we don't know where he is either. He left us 12 years ago and hasn't bothered to contact us or let us know where he is. Susan wants another baby and we're trying all the time, no luck yet.