My Wife's Mother

I'm Brad 32 married to June 30 and we've 2 children and one on the way. With several months to the birth of our third child, June has gone off sex entirely. Which is normal for her during pregnancies. But this time is different as she arranged for Sandra 47 her mother to provide me sex. Sandra now widowed (early 2021)as Robert her late husband didn't think the coronavirus was real and is now the late departed Robert. Sandra came to live with us after the death of Robert as her and June were always really close. So she sold the house and moved in with us. After June was confirmed as pregnant I saw them talking and sometimes looking at me. When I asked what was wrong got the answer nothing, so I dismissed it as nothing. Then June was home alone with me, as Sandra was out with the children. June asked me would I be prepared to do something special for her mother, I said yes not thinking much about it. Good so you will fuck her as she is very horny, because she isn't getting any since Robert's death. I was shocked and shocked again on Sandra's return with the children, June told Sandra I was agreeable. I was still unsure about everything, but that night my doubts disappeared. Sandra join June and myself in our bed totally naked, I was slow getting going, but fucked both that night and sex became regular after that. June turned off sex at the end of last month and Sandra took over providing me sex. I soon found out Sandra is very willing and she hasn't refused me yet and also asks me for sex. I've come to rely on having sex with Sandra and have been told she will sleep with us after the birth of our new baby in April. On being told that I was overjoyed, but kept it simple and replied sounds good.