Professor Corvus told Missy to come in for a meeting because

Professor Corvus told Missy to come in for a meeting because she is at the bottom of the class. The prerequisites that she took and the grades she got in them shows that she should be near the top. Whenever Missy has a problem in class she is always able to talk to her professor in order to work something out to keep her grades up. Talking quickly turns into shoving Xanders cock down her throat.