My wife and I are living a happy life, she is eight months pregnant with my first child. Just thinking that this happy life would last forever, Tsubasa's wife suddenly appeared. She is an extremely free person, she has been traveling for the past six years, so I have almost no memory of this sister-in-law. But this sister is too charming! When she is at home, she is not wearing a bra, even the pants she is wearing can see through to reveal her mysterious "stream"! Because my wife was pregnant, I was not allowed to have sex for a long time, and the accumulated sexual desire made my cock quickly erect in front of my wife's hot body. She also found out and approached me, touched me, and started fucking me even when my wife was nearby! And so the next time we kept fucking each other. She always let me drain all the sperm inside her, then let me rest for three days to accumulate more sperm and drain it all inside her again...