JK to Inkou Kyoushi 4 ~Namaiki Model Shoujo Hen~

Takashi is a teacher. One day, two new students come to his class, Shizuka and Satsuki. Shizuka is friendly and Satsuki is quiet. Days later, vice-principal suddenly orders Takashi to take care of them. Shizuka is actually selfish and egoistic... "Oh, are you sexually stressed out...? Ok, Satsuki'll help you..." [From ErogeShop]