I'm looking for an eromanga/doujinshi. It's a femdom.
In the story the girl (probably a highschoolgirl, i think she wore an uniform) forces the protagonist to have sex with her. On the last page there are vertical panels with the protagonist getting closer to her legs (she wore thighhighs or similar legwear) while mumbling something about her being a witch.
She had a dignified look, and if I remember correctly straight long hair.
It was only one chapter, probably a one-shot.
Pic unrelated.