Adult PC Game: M size - Ikisugi! M Lesson, Gone too far! Masochistic Lesson Final (eng) Archive

The main character is a college student and starts working as a private teacher to earn his living.
However, he is not well received at the houses he is sent to.
"Why do I have to be treated in this way!"
However, the job is well paid and he hesitates to let it by.
He collects himself and knocks the door of Shinohara family...