Charlotte has a big crush on Fox so she offers to do his homework tobe near him. Dusk wasn't always a vampire she was actually turned into one by request. Her sister was not happy when she enrolled into college but she couldn't show that. Dusk is more the type of girls who whants to have many kids so maybe she dates Fox and he only wants to have two kids and thats why she leaves him bc she wants a huge family. Dusk is more like the kind of girls Fox thinks he wants to date. #KelesyNotSoBerry