I'd love to find a dark, well-written student/teacher line. The basic premise would be a male student falling for and more or less seducing his teacher. In the beginning, she can't help herself; she goes along with the affair. At some point, her better nature kicks in. Reminded of her ethics, she breaks it off. (And now for the dark.) Her student isn't so ready to let things go, becoming obsessive and possibly violent.