This was so wonderful on so many levels. There really isn't one part I liked best because they all just worked together so perfectly and the whole Grand Canyon thing running through the entire series; their little promise to each other no matter where they were or how old. The whole thing reads so smoothly. The fourth bit hurt the most with Dean knowing and not doing anything but then letting Sam know he did know. ^_^ Gorgeous fic.

The only thing I'd point out is that I think you mean lair instead of liar for the harpy and troll pieces.