Different As It's Always Been (http://runedgirl.livejournal.com/66274.html) by runedgirl: "On a cold November day in 2015, the demons finally gave up on Earth and went back to hell. The angels left a day later. Sam woke up in the bunker the morning after everything changed feeling exactly the same. It took four years, three weddings, two guinea pigs, and Dean nearly dying for Sam to realize that nothing was the same after all. Especially his feelings for his brother."

After the End (http://archiveofourown.org/works/1727609/chapters/3683639) by amypond45: "Dean disappeared the night of his death. Sam's alone in the bunker, researching ways to bring Dean back, when a certain handsome devil shows up."