I really enjoyed this one. :)

Rude Awakening (http://www.fanfiction.net/s/9089865/1/)
Post 8x16 – Sam coughed again, tasting the bitter tang of copper in his mouth, and then wiped his lips; the gesture too familiar as he had tried to keep this hidden from Dean over the past few weeks. And now the secret was out. But apparently the secret was worse than even Sam had known because the coughing had never been this bad; the blood had never been this much.