Name of hentai series / video ?

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Saw this series a while ago, I'll give as much detail as I can remember. The Series is about a guy going to an adult video shop. One of the DVDs he gets is about a college student who finds out his teacher is lusting for younger guys and fucks her. There is a scene where the principal fucks her as well. Near the end, he arranges a group of guys to gangbang her cause her sex drive is too big and she keeps demanding sex with him in exchange for As in her class. She has blue hair and glasses if I remember correctly. Also, she has a reputation of being cold and mean and there is a scene where he secretly watches her masturbate then steals her stockings.