A serious study group turns into a naughty penis study group! But it's my fault! I'm timid, but I have high test scores. So, before tests, I always have study sessions with my female classmates in my room, and I always teach them! However, the girls who come to my place wear short skirts and are always defenseless, so I get panty shots all the time! When I see that, I can't concentrate on studying and I get an erection...