One night and two days of 1 night and left alone by my wife's sister who suddenly came over

Tooru was enjoying his fleeting freedom. My wife is not at home while preparing to give birth. I had no idea about taking this opportunity to play with women, and I spent my time relaxing, watching TV and reading. ...But then, my sister-in-law Sayu suddenly comes. He says he came to take care of Toru, who is in trouble with his wife's absence, but Sayu's goal is to have his brother-in-law's dick. Sayu grins and gives off a seductive smile. The dangerous night is getting older when we're alone...