Rook/Sirius took to muggle life relatively well. Harry had his fun teasing him, so he made sure to give him actual food. No kibble or canned stuff, that would have been too much. At night Rook/Sirius would sleep nearby or at the bottom of his bed.
At those times Harry took to telling him his life story. The previous version. He was going to leave out the death and time travel. In fact, he wasn't sure who he was going to tell or if he there was anyone he trusted. Previously, he would have said Hermione, but she was in on the plot to kill him.
He told his godfather about his life growing up. Harry had to take care to leave out some parts. He couldn't risk Sirius doing something rash to his relatives. Things with them were steadily getting better. Sirius was very interested about his years at Hogwarts.
Harry made sure to spend a lot of time telling him about Hogwarts. It was hard, talking about his 'friends' hit a sour note. He had avoided them once he was out of the chamber. There were just too many questions that he didn't have the answers to when dealing with them. How was Ron affected? When did Hermione start her plotting? Had they been spelled?
Instead, he focused on his classes. He mentioned the house rivalries, quidditch, and the classes he liked. Harry couldn't help but smile when Rook/Sirius perked up at the mention of the twins' pranks.
The next week fell into an easy groove. He started running in the mornings, using Rook/Sirius as an excuse. In reality, he needed to get healthier. Now that he was eating regularly, and his magical power weren't being blocked, he needed to be more in tune with his body. It helped guide the newly unlocked power coursing through him.
Morris had guided him to a treasure trove of books. Harry learned spells, solidified his ward work, began to learn rune crafting, and was able to study the history of the magical world. The last time around he hadn't given much thought to the history of the magical world. By the end of the war most of the books on it had been removed or heavily edited.
The previous night Harry had fallen asleep reading Spells for a Traveling Wizard. It was a book he would have killed to have in his previous life. He snapped awake at the sound of a bird squawking.
Harry froze, halfway to sitting, as he took in the sight before him. Hedwig was guarding the window from an owl that desperately was trying to enter the room. Every move forward was blocked either by a swift peck or a smack of the wing.
"Hedwig." Harry moved over to her. "They're just doing their job."
She turned to look at him.
"I know." Harry sighed. "It's your job, but they didn't know that."
Harry snatched a treat from the tray nearby and held it out to the owl. Hedwig gawked at him as he took the letter from the owl.
"They have had a hard morning." Harry held her gaze. "This is an urgent letter from the goblins."
Hedwig looked away, suddenly finding the backyard more interesting.
"Rook." Harry strode over to his dresser to pick out clothes for the day. "Want to go for a trip?"
The large dog hopped up. He let out a happy bark.
"We're going to Gringotts." Harry explained. "It's a bank run by goblins. Be on your best behavior. I'd rather not start a war with them because you decided to pee on the furniture."
Rook/Sirius grunted. Harry hurried to the kitchen. Dobby was hard at work at the stove. There were four plates of eggs, bacon, sausage, and some freshly made hashbrowns waiting at each spot. Another spot on the floor for Rook was set as well. Each one shimmered ever so slightly to show they were under a stasis charm.
"Dobby." Harry crossed his arms and glared at the elf. "Today is your day off."
"Yes, Harry sir." Dobby did his best not to look at the wizard. "Today I get to do what I want. Dobby wants to cook." He pointed to the stack of pancakes, waffles, and omelets on the counter nearby. "Dobby is cooking like Harry sir does, no magic. Harry sir was right, this is fun."
Harry tried, and failed, to suppress a smile. "What are you planning on doing with the leftovers?"
Dobby stopped. He looked at the stack of food. His face scrunched up.
"Dobby… will…" the elf drew the words out as he looked around the room. His bright eyes saw the letter Harry was holding. "Deliver the food to…" He squinted. "Gringotts. Yes, Dobby will deliver the food to the goblins at Gringotts."
"You're cooking breakfast for the goblins?" Harry crossed his arms.
Dobby nodded, making sure not to look anywhere near the boy. "Harry sir was not to bother Dobby on his day off."
"That is true." Harry smiled. "As it turns out, I have some business with the goblins today." He eyed the plate of food. "It looks delicious, but I don't think they'd be happy if I was late."
Dobby snapped. A freshly baked biscuit zipped over to the plate. An egg, a slice of cheese, and a few pieces of bacon slipped inside. It was nearly wrapped up in a napkin. Harry plucked the breakfast-to-go from the table and tucked the sandwich in his pocket. He had taken the time to charm all of his muggle clothes with expanding storage and small protections.
"Well, Rook." He looked to the dog. "Ready to find out where I come from?"
The dog cocked his head to the side.
"I'll explain on the way." Harry headed out to the street. "We're taking the Night Bus. I'm not doing any sort of magical travel on an empty stomach."
Rook woofed in support.
The bus pulled up a moment later. Harry smiled at the attendant. It was the same duo as the last time.
"Welcome to the Night Bus, day service." The attendant recited. "Where are you headed?"
"Gringotts."
The driver and the attendant snapped awake once they heard his voice. It paid to be nice to people in the service industry.
"Right this way." The attendant guided him into the bus. "Anything you need? Tea, coffee, bowl of water for you companion?"
"We're fine this morning."
Harry slid into the plush seat as Rook hopped up on the other. The attendant spared a look at the dog.
"She's certain looking healthier."
"He." Harry corrected. "Under all that hair and grit, he was a boy."
"Rather handsome one too." The driver chimed in.
Rook/Sirius looked over at Harry with a satisfied doggy-grin.
"Don't say that." Harry laughed. "You'll give him a big head."
Rook/Sirius scoffed.
"Didn't get to introduce ourselves last time." The attendant said. "I'm Stephen Laurie and this here is Hugh Fry."
"Nice to meet you." Harry nodded to each. "This handsome devil is Rook. I'm Harry Potter."
The bus swerved.
"You're serious?" Stephen asked.
"No." Harry shook his head. "That's my godfather. I'm Harry."
Rook/Sirius jolted at the joke.
"You're really Harry Potter?" Hugh asked.
"Yes." Harry nodded. "Don't get weird about it please. Keep quiet and you're looking at a tip every ride."