It's set in season 2, before Kurt and Blaine became a couple but after Kurt transferred. The ND had this assignment and Mike wanted to sing to Tina, but he was very insecure about it. He came to Kurt (at Dalton) for help. Kurt had Blaine come and help, too, because, in this fic, Blaine played the guitar. I remember that Blaine was a bit jealous for a while because he thought Mike was Kurt's boyfriend. And the song Mike wanted to sing was by Taylor Swift (I don't remember which it was, only that it definitely wasn't Teardrops on my Guitar.)
Thank you. :)
Mods, this is my first time posting, I hope I didn't make any mistakes with the tags!