I was a single-parent family working hard, and I always felt lonely for my son, Yuki. However, his son's friend Takashi was always by our side, and before we knew it, he had become an irreplaceable person to us. As I look at him, whom I have always loved like my own son, lately I have been driven by impulses... Every time he stayed over at my house, I found it extremely pleasurable to masturbate next to his bedside.