Disclaimer: Sherlock Holmes and properties are owned by Sir Arthur Conan Doyle. Sherlock and properties are owned by BBC One, Mark Gatiss and Steven Moffat. Harry Potter and properties are owned by JK Rowling. I don't make money from writing this fanfiction. The story contains spoiler for both Sherlock and Harry Potter. Also there are quotes from the novel and TV series.

Nobody but You

Chapter I

Mycroft Holmes worked at Foreign Office. The Foreign and Commonwealth Office, commonly called the Foreign Office was a department of the United Kingdom government. It was responsible for protecting and promoting United Kingdom Interest worldwide. Mycroft chose the department when he graduated from Oxford.

Mycroft already planned about his future ever since he was a child. He wanted to work in the government. And no, he didn't want to become Prime Minister of United Kingdom. He also didn't want to appear on television every day like some politicians. No, Mycroft was more polished. He wanted to be the brain. The man behind everything. The shadow ruler of England. He wanted to determine England's policy; he wanted to raise and to bring down politician, he wanted to control everything, and why shouldn't he? He had the intelligence needed for the task. Also, the position would provide him with the way to exercise his brain from boredom.

He had started young. Ever since he was in Eton, he forged connection with children from political background, and during his time in Oxford, he paved his way to the top. Once he graduated, he was offered the position as minor official staff in Foreign Office, which suited him well. Of course, the man didn't realize it at all that Mycroft had manipulated him into offering the position.

He rose quickly in the department. He provided an answer when complicated matters arise. He suggested ideas to his supervisor, and soon, people knew his name. He was included in many discussions, things that someone in his position shouldn't know, and he gave them all a way out of the problem. It was only time before he reached his ultimate goal.

Today, he had been summoned to help Lord Holdhurst, the Foreign Minister. Mycroft and Percy Phelps, the nephew of the said Lord Holdhurst was on their way when Mycroft saw two people walking in the hall. One of them was tall dark man and the other was tall young woman. She wore black Burberry coat, grey trouser and black shoes. Quite unusual choice. But what was captivating were the huge green eyes that dominated her gorgeous face. Their eyes met and Mycroft felt something weird in his head. That was only a split second. The woman glanced at Mycroft's companion briefly before she walked away.

"Holmes?" Percy Phelps asked.

Mycroft put fake polite smile on his face. "Come, Lord Holdhurst is waiting for us."

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Harry Potter surprised many people when he rejected offer from Auror office. They were so certain that Harry wanted to become Auror after he graduated from Hogwarts. Actually, no, he didn't want to become Auror. Harry had enough fighting with Dark Wizard after Voldemort. He returned to Hogwarts to complete his education together with Hermione and his other friends. Ron, though, didn't want to return to school. Instead, he moved on to become an Auror. As for Harry, he set to world tour when he graduated from Hogwarts.

During the two years journey, he saw and experience many things. Harry had visited both muggle and wizarding world and saw the difference between both of the world. Muggle world was experiencing fast development with new technology founded every day. Wizarding world, it seemed, was left a few centuries back. If this continued, it was only a matter of time before Muggle found out about the wizarding world.

When he returned to England, Harry quickly went to Kingsley Shacklebolt, who now was the Minister of Magic. He brought the matter to Kingsley and after lengthy discussion; they both agreed that something needed to be done.

Four years later, Harry was quite proud of his work. It wasn't easy, but he had support and input from his friends and families to achieve what he wanted. His work had revolutionised the wizarding world, and along with Kingsley, they created a new world for the wizarding community. Of course, this achievement was only known in small circle. Harry despised publication, journalist and media after everything he had gone through during Hogwarts. For the public, he was known as Healer Potter, Director of St. Mungo Hospital. It was his real as well as his cover job. Harry truly finished Healer training anyway.

Even though with everything he had done, there were still a lot of works. Harry with Kingsley, visited Whitehall as well as Downing Street quite often. It was the place where he saw the man for the first time. The man was tall with sharp intelligent grey eyes. He was dressed impeccably in three piece suits. There was something about the unknown man that pulled Harry.

When their eyes met, Harry tried to read the man's mind and was surprised when he found resistance. The man was muggle and yet, he was aware of Harry's presence in his mind. He pulled back and glanced at the man's companion. It was easy to read Percy Phelps' mind. Harry got enough information for the man.

"Interesting," he muttered.

"What?" Kingsley asked.

He turned to look at Kingsley. They had business to do at Whitehall after all. The man could wait. "Mycroft Holmes." He replied, smiling.

Author's Note:

Hi. This is my tenth Mycroft/Harry crossover. I always want to try my hand at androgynous Harry after reading many girly and feminine Harry when I read Lucius/Harry fanfics. In this story, Harry meet Mycroft at the beginning of Mycroft's career. Percy Phelps and Lord Holdhurst come for the Naval Treaty. By now, I've finished reading all Sherlock Holmes short stories. By the way, have you guys seen the Star Trek 2 poster?