Girls' School! GROUND BETTER FRICTION ONENY

6 female students with sakari stick together to take pictures! It seems that the schoolgirls with saccharities are masturbating while rubbish on the ground. Why is that!? Three conjectures can be made. First of all, even if you suddenly open the door and find it, you can quickly return to your natural position. Secondly, the weight of the clitoris gives you a sense of pleasure with weight. Thirdly, it is easy to use both hands because you don't use your hands. Please take into account the above assumptions.