The Potter Twins and the Sorcerer's Stone

Diagon Alley Part 1: Diagon Alley and Gringotts

Harry and Rose woke up in a small inn on the edge of London that they apparently had checked into the night before. They found themselves in the company of each other and realized that the preceding night was not a dream.

The twins headed down to the lobby where they found Hagrid sitting at a table with three cake-like muffins, each sized differently immediately allowing Harry and Rose to figure out who's muffin was whos; Hagrid's was fit for a giant, Harry's was about the size of his hand, and Rose's was similar in size to Harry's muffin but slightly smaller.

"Oh! Harry! Rose! Mornin ye two! We have a lot ter do today, so eat yer muffins, go get situated in fresh clothes and we'll be off shortly." Hagrid exclaimed excitedly. Hagrid ate his muffin in practically two bites before Rose and Harry had gotten there.

Harry and Rose ate their muffins quietly at the table, while Hagrid went off down the hallway to presumably find the loo.

Harry finally spoke up. "So.....I guess were siblings."

"Yeah. I guess we are." Rose replied.

"I'm glad to have been able to meet you at the zoo. I never thought we'd see each other again. Let alone start a new adventure together."

"Me either. I'm also glad to have met you too. I never thought I'd have a sibling of my own. Even with living with Uncle Remus, roaming the meadow is very lonely sometimes." 

"Well, you won't be alone anymore. You'll have me, Hagrid, and anyone else we meet along the way. So, don't worry about it too much." Harry said,  before picking up his half-finished muffin and taking another bite out of it. Rose smiled at him before picking her muffin up as well.

The twins finished their muffins quietly before heading upstairs. Harry changed in the bathroom while he politely let Rose change in the bedroom. Harry and Rose met up with each other once more, packed their things, and headed back down to the lobby. 

Hagrid was patiently admiring the cuckoo clocks by the front door while waiting for the twins. Once he spotted them, he opened the door and gestured for the twins to follow him. The three of them then set off to London to shop for Harry and Rose's school supplies. 

While making their way through an isolated street in London towards their destination, Harry read aloud the supplies list, while Rose and Hagrid listened closely.

" All First-year students will require:

-Three Sets of Plain Work Robes 

-One Plain Pointed Hat 

-One Pair of Protective Gloves 

-One Winter Cloak 

School Books Required:

-The Standard Book of Spells, Grade 1 

-A History of Magic 

-Magical Theory 

-A Beginner's Guide to Transfiguration 

-One Thousand Magical Herbs and Fungi 

-Magical Drafts and Potions 

-Fantastic Beasts and Where to Find Them 

-The Dark Forces: A Guide to Self-Protection

Students must also acquire:

-1 Wand

-1 Cauldron (pewter, standard size 2)

-One set of glass or crystal vials

-1 telescope