[This is a public thread in Becky's blog, but she's also speaking out loud as she types it. The bold is her commentary.]
And in his time of need, due to the loss of his younger brother, Dean turned to the only one he thought would understand - Chuck. Should I actually say how Sam was lost? Hmm... No, I can fix it later. This is getting too spicy.
Dean banged on didn't even bother knocking on Chuck's door as he stormed through the door. "Chuck!" He shouted, his emotions taking control. "You have to help me get Sam back!"
But Dean didn't know there was no way to get Sam back. Unless someone decides to write the books. But Chuck already had foreseen the near future, and knew both of their needs well. And he was ready to help Dean cope.