Touko-sensei no Rinkan Jugyou ~Onna Kyoushi Niku Ana Lesson~

Toko Kurami is a school teacher who often jumps to conclusions. She's so devoted to her job that when faced with her students' overactive sex drives, she thinks, "I've got to do something about it!" and decides to give them private lessons! Today yet another boy has come to her for counselling. He keeps glancing at her large breasts and blushing. "All right...I'll show you what to do."

[From HgameZ.net]