Aww, what a lovely story. I've always had a soft spot for Dudders and his obvious (and obviously growing) curiosity about the magical world. Of all the characters in canon, he is the one who makes the most sense to transcend the divide between the magical and the Muggle worlds. I like the natural and organic development of his and Milicent's relationship, but most of all I like how Dudley and Harry learn to be cousins, a family, after all these years. Plus, love the gringotts email address. I now picture them having their own server in some underground cave, guarded by a fire-breathing dragon.