"Since she wouldn't let me out until I'd decided to do something productive with myself, I started reading. The first book I grabbed was an advanced potions textbook. An ancient thing, back from when my grandfather was a student at Hogwarts. His notes were interesting and so I pulled more books, kept reading, and eventually decided it was interesting enough to look into more deeply. Of course, I wanted to use the knowledge to brew something strong and exceedingly bad for me." He grinned and Hermione made a face back, sympathizing with that. Deeply.