I enjoyed this a lot, from Sam alternately praising Dean to wanting to smack Dean upside the head, from Dean doodling in Sam's notebook to respecting his privacy at the end. Great job not only in terms of concept and format, but also in terms of capturing their relationship.

My favorite part:

I think the demons have him pegged all wrong. What they keep trying to use against him - it's not his weakness. It's the strongest part of him. The best part of him.

Lovely.