Anyway, it was searched for here: http://gleefinders.livejournal.com/285374.html
Basically, Kurt is sick, and Blaine and Finn tease him about sounding like a squeezed puppy. I thought it was the third chapter of Someday You Will Be Loved (http://www.fanfiction.net/s/6476585/3/Someday_You_Will_Be_Loved), but the story doesn't seem to match up (The current chapter 3 is based on the events of Grilled Cheesus - which I am pretty sure is before we even met Blaine). Were changes made, or am I slowly, but surely loosing my mind?
EDIT: Mystery solved - writer is apparently re-writing fic to include all of season 2.