Already better than Season Eight! (Which admittedly sets the bar low) I would call Game of Thrones: How Davos Saved the Day by Fan Fiction Man above and beyond!!
This is the first contender for the challenge (which doesn't end until next month 6/21 so there is plenty of time).
Fan Fiction Man posted the first chapter yesterday. I don't want to come off like a RR.Martin fanboi but FF nailed the writing style of RR Martin IMHO.
The characters popped and behaved as they would be expected to act. There was nothing gratuitous or over the top in this story. It was like reading a chapter out of the novels. The dialogue was spot on and this is the FIRST chapter (implying that this is not just a short story but possibly a serial).
There is still time to join in the challenge and post something but this is a strong contender for the top spot. I will certainly be following this story and I hope you will give it a read!
Well done!