The story
Her scent woke a curse mark he had sealed for years.
Elena is bullied without mercy at Asgard Academy for magic everyone agrees is pathetic. The ice cold Professor Cassius notices her for one reason only, which is that she smells hauntingly familiar and something long buried in him responds to it. He offers private tutoring as a cover story and helps her get her wildly unstable magic under control, and then he finds out what she actually is.