Identify Please help idetify hentai

alex798

Newbie
Apr 1, 2018
18
32
Hello everyone i have a problem finding hentai manga...
Thats what I remember about:
The first page was heroine in Kendo atire. She was having some conversation with her Kouhai, and after that Headmaster of a school blackmailed her with said Kouhai. Another thing I remember is scene, where heroine called Kouhai to get something in ventilation pipe (big hall in wall that he need to be on all-four to get in) and she was having sex (maybe anal hands to wall) with heasmaster while he was searching for an item... I think that artistic style looked close to 's.
Thanks for any suggestions :3