4 ideas: i don't know if you will be interested by this one because it's not with the golden trio. The captain of each team of quidditch meet and talk and rant on their players. I would like to see the other captains like the captain of the slytherin because they understand that they play like that. Perhaps they can rant on the players.
I do like this prompt because I’m going to turn it into one of my favorite rare pairings in HP. Also gossiping about their players sounds like fun.