Little Girl☆Lesson ~Kyou kara Hajimaru Lolikko Choukyou Isshuukan!~

Marina Nozue comes up with a plan to satisfy her sexual curiosity and successfully hires a tutor.
She assumes a quiet, studious tutor would be the perfect practice partner for her sexual exploration.
However, the tutor (the protagonist) turns out to have far more deviant and extreme tastes than Marina could have ever imagined.
Before she knows it, Marina loses control to the protagonist, who begins to lewdly "train" her body.
The protagonist's insatiable sexual desires soon extend to Marina's friend, Yukina, who also gets dragged into the erotic "training."
Virgin deflowering, urine play, foreign object insertion, public fellatio, gynecological examinations, urine enemas, and more!
The story takes place over a week of increasingly erotic and extreme scenarios—what will be the outcome of this secret lesson!?

[Translated from dlsite]