Oh, this is beautiful! Your Hestia is a darling, and I loved seeing Petunia come into her own in this wonderful, believable story. Love that they have to come to terms with a few things, and that this takes them some time. And all the fun little bits of fanon and canon meta -- like this:
"He thinks you're all queers," said Petunia, sipping her own brandy. "Not that you are, of course. At the rate you breed. And you marry so young." She sniffed. "All shotgun weddings, of course."
Also, ♥ for Merlin's ancestors and double-pronged thingummies, Freud, wands and all that, and for Witch-Muggle understanding! (Personally, I'm convinced that Hestia will never get the hang of that oven.