Mixing up Trouble

Hermione's quest to be the most awesome Hermione ever means, in her quest for knowledge, that she needs mentoring to excel in a subject...harder than Charms. Charms is awesome, and all, but not "Ministry Material." No DADA professors can mentor her (dead, crazy, no standing, not real, and no way in hell, in that order) So it has to be another subject. Potions. Set during HBP Canon.