After reading an excellent “One Week Late” by Bethany Delleman, I hoped that this story might another (very rare) example of non-canonical pairing P&P story. I have always thought that the relationship between Colonel Fitzwilliam and Elizabeth could be very interesting to explore, and generally that a relationship with a solider (looking how well the relationship with a sailor worked in “Persuasion”) could be interesting as well. Except the story had did not much of that exploration. Since the first wedding, it was quite obvious how it will end and there were only two ways how to achieve that end, neither of one which I liked. In the end the author decided to follow both of them. Oh well.
If you want a non-D/E story, I could suggest “The Measure of A Man” by maembe13.