Kay, I got the story! Another one coming up on 8 O' Clock where I live, so I'll update that next! And the next one is about...*starts sobbing* FRED AND GEORGE. GRED AND FORGE. WAAAAAAHHHH EHY QUEEN?

But it should take place in Half-Blood Prince, so Fred's not...you know.

I could only find a paragraph to copy and paste since Pottermore wot let me, so here you go: An excerpt from "Spinner's End", by J.K Rwoling (not by me obviously):

Uncle Vernon has a vague idea that Cokeworth is so distinctly unmagical, the letters will not follow them there. He ought to have known better; after all Petunia's sister, Lily, turned into a talented witch in Cokeworth.