"Sister-in-law! What are you doing?" While his wife was back home to give birth, Toshiya was enjoying a brief moment of singlehood, but suddenly, while he was masturbating, his sister-in-law Erika called out to him from behind. She was worried about Toshiya and had come to check on him. He hurriedly hid his crotch, but it was too late. Seeing Toshiya's cock, which had become rock hard from all the pent-up ...