My brother's big breasted wife

Erotic novelist Ichiro lives alone. However, Nanako, his younger brother's kind wife, worried about Ichiro and took great care of him, often having dinner with him at his brother's home. One day, he witnesses his younger brother and Nanako getting involved. Ichiro, who had a secret crush on Nanako, was shocked but his fantasies continued to expand in his head, and before he knew it, he was drawing her as the main character of an erotic novel. The next day, Nanako, who came to Ichiro's house to bring him food, read the text...