Aya, the older sister, is trained to be a human toilet by her younger brother. The younger brother shoves his huge cock all the way down her throat, strangles her, spanks her, and tramples on her, driving her to a mental breakdown. As if that wasn't enough, he tortures her with indescribable abuse, shoving his raw cock into her hairless pussy without hesitation, and cumming inside her with fishy semen.