I'm an ugly but science-oriented guy, and when a test is about to come to my house, a liberal arts girl who's not good at math comes to teach me. But she soon gets bored and starts to take a rest on the bed, and her skirt flips up, giving me a glimpse of her panties! I can't stand it when I see her plump ass right in front of me! The girl finds a porn magazine and starts to move, and seems to be interested in my crotch...