Disclaimer: Dumbledore belongs to Rowling, Holmes to Doyle.
Sherlock Holmes sat close to the back row at the funeral of his cousin, longtime friend and childhood playmate Albus Dumbledore. All of the people who attended attested to the legacy of the great man. Holmes looked out over the seated crowd as the eulogy given by a man who never even known Dumbledore dragged on. Amongst the crowd sat the Boy-Who-Lived as well as many great dignataries and celebreties. The people who drew his attention most however were the heirs to his and Dumbledore's legacy. This legacy was much older than Dumbledore's teaching and being a Headmaster, and his work as an Auror and a freelance muggle detective. Sitting beside the woman with the pink hair was Moony, the last of the Marauders. Elsewhere in the crowd were the Weasley twins who had been the most recent holders of the title of Official Hogwarts Pranksters.
Holmes fondly remembered his days at Hogwarts. The days before Moriarty had become a minor dark lord and a master of crime, and he the man to bring him to justice. There were times when Holmes wondered why his former friend had allowed himself to fall to his death instead of apparating away as he himself had. Dumbledore had been there for Holmes through all of this. Dumbledore had been there for his cousin and friend through thick and thin since before their first day at Hogwarts, and for long after.
When He and Dumbledore had started at Hogwarts, Black had become the new Headmaster and indoor plumbing was installed by a man named Gaunt after nine hundred years of complaints from the merfolk in the lake had gotten through. It was at Hogwarts that he, Dumbledore, Moriarty, Dryfus Weasley, and Horus "Harry" Potter had formed their own little club, constantly flaunting authority and playing pranks on the whole school in general, and their archenemy Alcasus Malfoy in particular.