YST-309 Nanami Yokomiya silently devoured her younger sister who started doing layers

Nanami, my cute younger sister, is embarrassed to go out in public, but when she's with her beloved brother, she gets excited wearing the cosplay costume she recently started doing. The photo session begins with her older brother's smartphone, and of course her older brother bulges out her crotch while taking erotic photos of Nanami. 'Isn't it a bit strange? Even though I thought that, my brother's