The sense of immorality of being able to do as you please with the obedient Yui is even more exciting!!! She says she likes to be teased, and when she is relentlessly teased down there with a vibrator and not allowed to cum, her sweet moans are arousing!! She plays with her brother's dick with her Yui personality, but in the end she begs him to "put it in...I don't want you to pull it out..." Furthermore, the video of her becoming a young wife and being toyed with by the old man with his intense pistoning smells of crime and is irresistibly erotic!!