The fic written for me was also Petunia/Weasley, oddly enough.
I had a lot of fun with the supporting cast--Augusta in particular, who is prickly and overpowering and also tender about some things.
In other news, it cracks me up that I wrote a fic in which Harry is only present for roughly 1/6 of the thing, actually active/talking/whatever for more like 10%, and you recognized me from him.