Two girls have been friends for many years. They study at the same school and have fun together all the time. Nature gave sexy bodies to girls, but it doesn't help them in studying. They had to fix their problems in calculus, so they went to their teacher and had an extra class. The teacher was an aged strict woman and when she asked girls to undress and pet each other young nymphs were shocked. She promised to give them a good grade instead, so boring extra class turned to filthy action of two coeds and perverted teacher watching them.