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

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