Shy Sister

I have only one sibling a sister Janette 24 who is at the local university and lives with me. Both our parents have died in an accident (2019) and that left just me and Janette. As the oldest it was up to me look after her and I (Andrew 30) had just finished university at the time and already had a good job lined up. I comforted Janette over the loss of our parents and we decided to sell the family home and buy a new home together as far too many memories in the old home. Janette has always been a quiet person and not outgoing in many ways except with animals. She is always more comfortable around animals than people. I did date but hadn't found a girlfriend at the time of our move to our new home. With Janette being so quiet and both having the same surname, the neighbors assumed we were married. I go to work early and Janette would go to the university and she would be home before me. I was very busy at the time and didn't interact with the neighbors. Janette saw them and usually just nodded to their questions and rarely spoke. Somewhat strangely nobody asked her how long had we been married or other questions they would've told Janette of their belief we were married. They had assumed we were and that was that, it was also re-enforced by the fact that we only seemed to go out at night together. I was busy at work on a project and it was taking most of my time and being the new guy wanted to make a good impression. Then when Janette was on a break from her studies I took leave and we went away on a holiday together. While away Janette caught me masturbating and wanted to touch my cock and I let her and by the time we returned home I was fucking her. She was willing and I was horny and so I fucked her and didn't take the care I should have done. Well I decided what's done is done, one benefit of her being pregnant you don't have to take precautions again until after the birth of the baby. Janette was at the doctors surgery and and a neighbor heard she was pregnant and congratulated her of her being pregnant and saying your husband Andrew must be frilled. Janette just nodded and left it at that, on hearing that everyone in the neighborhood thought us married. I said we would keep it secret that we're brother and sister. Our daughter Grace after our late mother was born (early 2021) healthy and Janette is very happy and still sleeps with me and also has asked me about having another baby and I have agreed.