Maria, my wife's sister, came to help my wife who was about to give birth. Unlike my plain wife, my sister-in-law was beautiful, stylish, with ample breasts and a well-toned body. As he was frustrated by the lack of sex with his wife who was about to give birth, he couldn't resist the sight of his sister-in-law's swaying breasts and cleavage and secretly masturbated. However, his sister-in-law noticed that he was masturbating and got close to him, asking, "You've been looking at me this whole time, haven't you?" and he gave himself over to her.