Kan'ochi x Namaiki Gyaru ~Chou Kimochi Ii! Atashi, Sensei no Niku Onaho ni Naru!~

“Dammit! Let me go! Get off me!!”
—Private Reisou Academy.
Deep beneath the school lies a reform facility for problematic students who are too much for regular teachers to handle. Rarely used, the facility is managed by Inahara Yoshito, the school’s health teacher.
This time, the target is Shirakawa Erina, the daughter of a wealthy real estate tycoon.
Erina is what you’d call a “gal”—a spoiled rich girl who’s been running wild at the academy, thanks to her parents’ hefty donations. But her behavior has escalated to the point where even the staff can’t ignore it anymore. Finally, the principal orders Yoshito to “reform” her.
“Now, now, Erina… calm down. Here, why don’t you take a whiff of this aroma to relax?”
“Who the hell would—?! Stop it! Aaaaaah!!!”
Yoshito uses a special concoction of his own making to cloud his target’s mind, making them suggestible and… responsive. Smirking at the now-subdued Erina, he begins his work.
“Heh heh… much better. Now, let’s start with…”
With the help of his assistant, Suwa Seika, Yoshito has “reformed” countless problematic students in the past. And now, it’s Erina’s turn to fall into his trap.

[Translated from dlsite]