This is very good. As teacher myself, I'm usually wary of teacher/student fic, but I like the way you complicate the issue here, not offering easy justifications. It takes an extreme situation to break Aurora's resolve, and the moral murkiness of her position doesn't go away. Pansy's confidence is clearly that of youth, someone who knows she can have power but who doesn't know how to control it or really understand where it might lead. They're both well-characterized, from Aurora's tendency to try to control things through analysis and quantification to Pansy's bravado and imperfections. They're both flawed and complex and also appealing and human. Well done.