Sister wanted a Baby update

Since my last story my sister had our son and is enjoying being a mother. She has also decided to stay fulltime with me, all our sex is unprotected. As she says she will take every chance of getting pregnant again. I've added 2 more rooms to my home as our parents are regular visitors since the birth of their grandson. It doesn't impede our sex life as there is a secret connecting doorway between our rooms when our parents are visiting. Otherwise, we sleep together, I don't expect Lauren to get pregnant soon. She is still breastfeeding, it supposed to reduce the chances of her getting pregnant. She has mentioned already to our parents about trying for another child by IVF. Whether they know or not about me and Lauren I don't know, if they do, they haven't said anything.