Future Tense by selecasharp

Future Tense - selecasharp
A well written fic told from Sam's pov, set after the guys have started the apocalypse. An encounter with a tree spirit shows the brothers a vision of an intimate future together. Dean immediately becomes cold and distant but Sam is determined to find out if the vision can become true.
Source: http://amalthia.mediawood.net/ebooks/viewstory.php?sid=1150