Disclaimer, If I owned Harry Potter I would never have brought Ron Weasley back into DH after he deserted the hero and heroine. Then again I would never have written those in my opinion two awful books HBP or DH So I definitely am not JK Rowling.
The world was left behind
Harry James Potter was reading the letter he had received from Gringotts just a few minutes earlier, when he heard the awful howler from Mrs Weasley that accused his best friend Hermione of being a scarlet woman and a gold digger. Harry was already getting angry due to the letter he had read informing him that there was no such thing as a magical contract if he had not personally signed one or taken an oath on his magic to swear one.
Harry looked at the tears falling down Hermione's face for a few seconds before he decided what to do. Taking hold of Hermione's hand he turned her sad face up toward him and said quite loudly so those around them could hear him "Forget what Mrs Weasley says Hermione, would you do me the great honour of becoming my girlfriend, please."
Harry held his breath as he waited for Hermione to answer him. When she suddenly wrapped him in a hug and said yes, he could not resist pulling back a little so that he could kiss her right there in the great hall in front of everyone, letting them all know he was hers because he wanted to be.
Harry showed Hermione the letter he had received from Gringotts and commented on just how disillusioned he was with Hogwarts and the wizarding world in general. He expressed just how angry he was with Dumbledore for doing nothing about the prophets insulting and derogatory remarks about one of his students, namely her.
"I've a good mind to pack my trunk and leave the lot of them behind," he stated heatedly.
"Well if you do leave then I'm coming with you," Hermione said as she stared angrily at Ron. There were still some bad feelings about how Ron had treated Harry before the first task.
Just two minutes later Hermione opened one of the many letters she had received and was sprayed with Buber pus all over her hands which immediately began to blister as she screamed in pain.
Harry asked Lavender and Parvati, Hermione's dorm mates to rush her up to the hospital wing. He then stormed up toward the head table where the headmaster and his deputy sat quite happily discussing the tournament's second task. Before Harry reached the head table he heard the sneering voice of his hated enemy Draco Malfoy.
"I see your mudblood whore got what was coming to her," Draco sneered openly.
Harry watched a few moments waiting for the two senior professors who had to have heard Malfoy, say or do something but they just looked at Malfoy for a moment before resuming their conversation as though there was nothing wrong.
"Hey scar face I'm talking to you," Draco snarled at Harry's back.
It was then that Harry's very weak grip on his temper gave out and he snapped, using fighting skills he had honed while at school with Dudley Dursley and his gang, Harry did a spinning high kick that landed on Draco's face breaking his nose. Harry then landed a hard left hook on the Slytherins jaw using the momentum built up from the spinning kick. Harry managed to land two more good punches to Malfoys head even as the Blond haired bully fell to the ground, out for the count. Malfoys two cronies went down when Harry launched at them with a sort of flying kick aimed at their most vulnerable parts. His kick ended as each foot landed in the groin of one of the two idiots leaving them rolling over on the floor in a foetal position holding on to their now severely swollen and more than likely ruined family jewels, while gasping for air.
Harry rose from the floor where he had landed after taking out Malfoys goons, he was about to say some thing to Dumbledore about the lack of help for Hermione. Before he had chance to speak Dumbledore was telling him off for using violent behaviour, McGonagall also had said she would see that Harry received a month of detentions with her for his unnecessarily violent behaviour.
Harry was finding it hard to believe what was happening. Hermione had been insulted by Malfoy, Rita Skeeter, the prophet, and Mrs Weasley as well as receiving a whole pile of hate mail and howlers, she had even been physically injured, and they were giving him detentions for what he did to Malfoy. With an exasperated gasp Harry threw his hands up in defeat and turned away from the headmaster and walked from the hall. He made his way up to the hospital wing where he found Hermione still being treated by Madam Pomfrey. After the school healer had finished treating Hermione and supplying her with a large jar of some foul smelling salve to be put on her hands twice a day for the next five days, the two young teens left the hospital wing.
Harry told Hermione what had happened in the great hall and that he had decided he had had enough of this evil world, he was going to return to the muggle world and never return to the wizarding world unless he was forced too.
By the time they had reached the Gryffindor common room Hermione had made her mind up. If he was leaving then she would leave with him. He had after all been the centre of her world for the past three and a half years. She could not see her self at Hogwarts without him there, he was after all the only reason she had not returned to the muggle world after her disastrous start to her first year.
Harry Potter leader in the tri-wizard tournament and Hermione Granger the smartest witch to have attended the school for more than a century packed their belongings and simply walked out of Hogwarts without a single person seeing them.
Reaching the village of Hogsmeade Harry held out his wand and summoned the Knight bus. Once boarded they found a seat and hugged each other until they reached London getting off the bus at Euston station just in case anyone tried to find them. The two teens took the underground to get to Diagon Alley where they entered the Leaky cauldron under Harry's invisibility cloak. They remained under the cloak until they entered the office of Griphook, Harry's Gringotts account manager. With their business at the bank completed they used a goblin supplied portkey to one of the hidden Potter homes that Harry had asked for after he had taken the address from his family vault.
They had all they needed especially once they had sent the Potter house elves to fetch Hermione's parents and asked them to spend some time with them while the expected uproar and following search for Harry went on. Harry Potter was no longer bothered about the wizarding world, he simply vowed to keep safe to the best of his ability those he now thought of as family.
Sirius after receiving a visit from a house elf found his way to Harry's house one week later to find Harry, Hermione and the Grangers being taught things they might need to know by house elves…
