So, this is very vague, it came to me while I was re-watching the ep Sexy, the scene where the Warblers sing Animal.
All I really remember is that it was post either after the episode was aired, or it was considered spoilery at the time because it was speculating about the photos of the Warblers dancing in what looked like a warehouse? It was supposed to be a 4 parts fic, but the last time I read it, there were only 3 parts. In the fic, the place where the Warblers sing was owned by one of them. It's strange to say this, but the only thing I really remember is that it was really well written, and quite emotional. And it was either Klaine or pre-Klaine.
I know it's really really vague, and I have very little hope that someone will know what I'm talking about, but, hey it doesn't hurt to try, right?
Ptijade *crosses fingers*