Forced to make a wall-ass by her brother, a fan of erotic comics, her restrained masturbation hole is then mercilessly penetrated by her lustful, massive penis, resulting in a squirting orgasm. (Tenma Yui LULU-429)

The younger sister, worried about her brother who was staying home all the time, went to check on him in his room and found him making a "wall-butt" scene from a pornographic comic! Seeing her usually listless brother suddenly become serious, the sister decided to help him make the wall-butt. However, seeing her large buttocks confined by the wall, the brother's lust exploded, and he directly penetrated her immobile vagina! Unable to bear the pleasure of live masturbation, the brother ejaculated inside her, causing the sister to involuntarily orgasm. This is the beginning and end of incestuous acts that transcend blood ties.