1) Can it be Fangs and Fury (https://www.fanfiction.net/s/9366261/1/Fangs-and-Fury) by morgana07? It's post-Purgatory though.
Summary: After another fight, Sam goes out to cool off when Dean gets jumped by vampires looking to use him as bait or food. It's up to Sam to find his brother before he's turned or killed & he's forced to call upon the last person he ever wanted to ask for help or risk losing Dean again. *Hurt/limp/angry/sick!Dean; Protective/concerned/worried/furious/limp!Sam (Benny's here as well)
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Summary: After another fight, Sam goes out to cool off when Dean gets jumped by vampires looking to use him as bait or food. It's up to Sam to find his brother before he's turned or killed & he's forced to call upon the last person he ever wanted to ask for help or risk losing Dean again. *Hurt/limp/angry/sick!Dean; Protective/concerned/worried/furious/limp!Sam (Benny's here as well)