With her boyish short hair, dignified features, and slender, muscular body with prominent abs, Ai Mukai is the kind of beautiful, athletic girl you'd expect to find on the track and field team. Now, she's playing the role of a sexy, cute little sister, engaging in a lustful, incestuous sexual encounter with her perverted older brother! He fondles her small breasts, relentlessly licks her pussy, and finally thrusts his massive, rock-hard cock into her, sending her into agony...