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 wearing the cosplay costume she recently started doing. The photo session begins with her older brother's smartphone, and of course, the older brother is eager to take naughty photos of Nanami and makes her crotch bulge while taking pictures. 'Isn't it a bit strange? Even though I thought that, my brother's