Further domestic bunker!fic wincest recs:

In Silence Sealed by rivkat
Fiercelynormal tagged me with “piercing.” After a hunt, Dean can't hear, but he can still talk. Warning: may induce diabetic coma.

Well, This is Awkward by Blue_Jay
After hearing Charlie talk about the Winchester Gospels, Kevin decides to check them out because it's not like he really knows all that much about Sam and Dean, right? And he really, really knows he should stop reading for the sake of his sanity, but it turns out the lives of two idiots who started the Apocalypse are more interesting than he thought.
Charlie agrees.

This one's a more sombre take on the bunker domesticity, because it's set sometime after 9x11, but it still has some very sweet domestic moments:

The Old Man of Peru by de_nugis
Sam gets bitten by a bat. He probably doesn't get rabies. He probably isn't a werebat, either.

Plus there's this fill at spn_masquerade:

The Way to Sam's Heart...
Dean decides to woo Sam with his awesome cooking skills now that there is a fancy bunker for them to live in. Sam is oblivious to his efforts.