Shinji fell down the stairs at his cram school and got seriously injured. Unfortunately, both of his parents were on a trip, leaving him alone at home. Concerned for Shinji, his brother Kazuo and sister-in-law Tamaki came to take care of him. Shinji had been attracted to Tamaki for some time, and despite his restricted movements, he couldn't take his eyes off her. However, even masturbation was out of the question now… Then, noticing Shinji's suspicious behavior, Tamaki made him promise 'just to watch' before she started performing lewd acts in front of him…
