No surprise that all of these will be h/c fics. So if that's not your thing...go elsewhere. ;)
Neither of these is overly long. The first is a little over 3,000 words. No clue about the 2nd one.
:: Tortured Souls by Scoobert0
Author's Summary: Dean is kidnapped and tortured by demons and Sam has to save him.
Lots of graphic torture of Dean in this one and Sammy to the rescue!
:: Head Games by tifaching
Author's Summary: Concussed, temporarily blind Dean is tormented by the spirit that injured him. Awesome Sam to the rescue.
This is one amazing and menacing spirit! Note: This is a 2-part story.