My Sister Joan Update

My sister Joan and I started to live together after the death of our mother Harriet and I started to get horny around Joan and made a move on her and that when we started sleeping together all the time. Joan got pregnant and we had a son Richard after Harriet's late father in late May. We are now back to full sex and are happy how things are and Joan wants a least one more child and I'm willing also. As soon as Richard is weened, we will start trying again. But all our sex is without protection and one more or more than I will happy either way.