2) Quinn is singing something in Glee and she's subtly flirting with both Finn and Puck through the song. Puck comes over and sits by Kurt and talks to him about 80s power ballads and wondering if he should perform 'Every Rose Has Its Thorn' when it's his turn. Kurt suggests something else (something by Bon Jovi?) and they keep talking. Quinn is now staring right at them, not even pretending to look at Finn anymore and it says something about how it's the first time someone ever took Puck's attention away from her.
Oh, and I'm pretty sure it was either slash or preslash of the Puck/Kurt variety.
Does anyone know what fic/series this is?
Found! Music Is What Feelings Sound Like. Apparently the second scene I was talking about is from another fic. Or rather, the Quinn part of it is. The music conversation does happen in this series. Link to the last fic (earlier fics linked in the author's note at the beginning):