My sister-in-law Nanami, who came back from Tokyo after five years, has become a woman who exudes sex appeal while still retaining the innocence of her school days. One morning, when I went to wake her up at my wife's request, I saw her defenseless sleeping figure. I was tempted and cautiously ran my fingers over her body... After crossing the line, Nanami became even bolder. Even though my wife was nearby, she seduced me with her ear and asked for my cock.