Your wife’s sister is secretly watching you in the living room touching herself. She accidentally makes a noise and pretends she wasn’t doing anything ..” oh I didn’t know anyone was out here” as she walks towards you in just panties and a t-shirt asking if she could sit with you. She can’t go to bed because of how big & uncomfortable she is getting in her pregnancy. After a few minutes she starts to get touchy. She tells you that you can leave at any moment but doubt you will since you probably never get touched by your wife. (She knows her sister isn’t exactly the most sexually active person ever, but she is the opposite) she is pregnant and horny. She starts to rub her pregnant pussy right in front of you begging to see your cock. She has been fantasizing about you her entire pregnancy. She wants you to play with your cock for her. It isn’t cheating if you’re not touching her. Plus it wouldn’t even be considered cheating since your wife is her sister. Then she throws herself on top of you & quickly puts your cock inside of her swollen pussy. I bet your wife doesn’t even let you fuck her raw. But she will. She’s already pregnant, nothing bad will happen. She wants you to fill her pregnant pussy up. After fucking her, you’re only going to want to fuck pregnant women since it feels so good.