Shou-ta, a precocious butt fetishist and erotic demon, targeted Rei Kuruki, a kind big-butt older sister who cares about her younger brother! Knowing that her younger brother was being bullied, Rei scolds Shou-ta. But, Shou-ta offered a lewd exchange condition instead of stopping the bullying! Rei offers her butt to Shou-ta for her younger brother's sake... Excited by the denim butt, writhing in agony with the T-back butt, and going wild with the raw butt! Shou-ta's signature butt-rubbing play explodes against the over 90cm firm, huge butt!