Seduced brother's wife

Shinji fell down the stairs at the prep school and was seriously injured. Unfortunately, my parents went on a trip and were the only one at home. Worried about Shinji, his older brother Kazuo and his brother's wife Tamaki came to take care of him. Shinji, who had been attracted to Tamaki for a while, was captivated by Tamaki's appearance despite his crippling body. But now I can't even masturbate... Then, when Tamaki notices Shinji's suspicious gaze, he makes Shinji promise him, "Just look...", and shows him an interesting, obscene act...