Sam wakes up screaming, and Dean holds him till the sun rises.
"If Jessica walked through that door right now and offered you everything you missed out on and everything you ever wanted, what would you do?"
"I'd take her hand. I'd kiss her. And I'd say thankyou, I'd say I'm sorry, and I would say goodbye."
Sam wipes away Dean's tears and holds him till the sun sets.
-:-
At the hottest part of the day when the shadows are banished by the sun, Dean grumbles that it's too bright out. Sam snorts and hands him his sunglasses.
"If mom walked though that door right now and held out her hand, would you go with her?"
"Only if you were coming too."
At the coldest part of the night when the shadows swallow souls, Dean sighs because it's always too dark. Sam reaches out across the gap and takes his hand.