Injuu Kuma-tan no Gen'ei Vol. 03

My body turned into that of a sex beast, and I violated my precious litte sisters. My childhood friends, my juniors at school... they're all my cute little sisters. My penis penetrated my sister's genitalia... My lower body got numb from the heat inside her. Violating your little sister, such an immoral deed. But even so, I had numerous times thrust my hips, seeking to get more pleasure out of it. Before long, I would reach a climax. One day, I turned into a bear sex beast, and violated her even then. What will become of the brother unable to become human again, and what of his sister...!?