Snape’s lip curled. "Of course not. Hogwarts discarded the few books on the subject centuries ago. Even from your beloved restricted section. And you wouldn’t find it in the Black or Malfoy library either. No one as proud as a Black or Malfoy cares to admit their sad little feelings are any more than character flaws." He tilted his head to one side, then the other, seemingly getting rid of any neck cricks a portrait could have. "Lucky for me, my studies as a Potion’s Master lead me to these musings."