Yuki Nee-chan no Kan-nou Gokko ( Manhwa Porn )

First year Highschool boy Shin Yuki stumbles one day upon his naked childhood friend,Yukino Kurose, reenacting a sensual scene with an mannequin in an empty classroom.She is a third year student who wants to experience first hand scenes from the book she reads and wants Yuki to help her!Things get a bit complicated though as her favorite books are erotic literature….