Title: Lineage Ligno: A Family of His Own

Summary: It started out as a simple summer assignment; it ended up changing his life forever. After using a lineage potion as part of a combined potions and history project, fifteen year old Harry Potter finds out he is not a Potter after all, and that his father is a self-proclaimed Sociopath who committed suicide nearly three years ago. Harry wants answers so he goes to the one man who knew his Dad best, Dr. John Watson.

Rating: T

Warnings: Mentions of Abuse, possible violence, possible mild language, possible light/non-graphic slash

Disclaimer: I own nothing but my ideas for the AU plot, as well as any and all errors in spelling and grammar. I do not own Harry Potter J.K. Rowling does. I do not own Sherlock; that right goes to Steven Moffat, Mark Gattis and Sir Arthur Conan Doyle. Any recognizable lines, characters, or places in this work are from or inspired by the Harry Potter books and Movies and the BBC Sherlock Series.

Chapter One

Harry sat nervously in the waiting room of Ashford Hospital having finally finished filling out the standard medical forms. He couldn't seem to keep his leg from bouncing, and his emerald eyes darted restlessly around the room constantly surveying the doors and people.

Harry knew he was taking a huge risk leaving number four and the supposed protection it provided, and he knew that his Uncle Vernon would be livid at an afternoons worth of missed chores, but he would risk his Uncle's wrath to find the truth. Unfortunately for Harry, the man that may hold the answers was miles away from Privet Drive, and working at Ashford Hospital. Harry sighed heavily thinking back to the events that had thrown his life was in chaos.

LLFHOLLFOHLLFHO

It all started with a combined Potions and History of Magic summer assignment. During the last week of school, the students brewed a Lineage Ligno potion. Once activated with three drops of blood, something Harry was never short of during summer break, the potion was to be poured onto a specially pretreated parchment they received in History of Magic.

The parchment would then show their family tree, listing names and dates associated with each member. There assignment was then to research their history looking for more in-depth information on several people in their family and present the assignment in history at the beginning of their fifth year term.

Despite the death of Cedric and the debacle that was his fourth year, Harry was for once looking forward to a summer project. He figured it might help him keep his mine off the third task, and that it would be easy; he already knew the basics about his family, and while he did not have access to some of the wizarding genealogy materials his classmates did, Harry did have access to his parent's best friends, one of whom happened to be his Godfather. Harry figured he would write to both Sirius and Remus for more information on his parents' extended family, and maybe get a few marauders stories while he was at it.

As his uncle always locked his school things in the cupboard under the stairs at the beginning of every summer, Harry had to take precautions if he wanted to get at least this one assignment done, so after a bit of thought, Harry smuggled the parchment in under the newspapers in Hedwig's cage, and after placing an unbreakable charm on the potion vial, placed it in the pocket of his most baggy jeans with the hope that none of the Dursleys would notice. He had breathed a sigh of relief when he made it up the stairs with both the parchment and vial intact; now however Harry almost wished the items had been confiscated.

LLFHOLLFOHLLFHO

Three days into summer break Harry was hit in the face by a heavy handed blow from Vernon because he had slightly over cooked the stake at dinner. While Harry wasn't thrilled with the blow to his nose, it had provided the blood he needed to activate the potion, and with a small amount of anticipation Harry added the three drops, and shook the bottle watching with fascination as it changed from a near translucent blue to a darker navy color.

Grabbing the empty rubbish bin, Harry carefully placed the parchment in the bottom, and hoping that the potion would still work on parchment that wasn't completely flat, he began drizzling the potion over the parchment. He watched in amazement as the parchment absorbed the olive oil constancy liquid and started forming the letters, lines, and numbers that made up his ancestry.

Snatching up the parchment Harry greedily looked it over, his eyes, lingering on a few names before finely finding the names Lilly and James Potter. It was then that all of Harry's enthusiasm for the project turned to confusion and dread. Under the name Lilly Potter was a maternal line that connected to the name Harrison Holmes; the name had Harry's birth date, but the paternal line did not lead to James Potter, it led to a man named Sherlock Holmes.

For several days Harry had alternated between feeling numb, angry and confused and his nightly nightmares about Cedric were not helping. He finally came to a decision about his paternity after another violent altercation with Vernon, which left his shoulder bruised aching and swollen. He wanted out of the Dursleys house and finding his father would be one way to do that. So Harry took the opportunity to scour the internet for any mention of Sherlock Holmes one afternoon when the Dursleys went to the cinema. What he found shocked him, Sherlock was apparently a muggle who worked as a consulting detective, but, if one was to believe the tabloids which Harry took with a grain of salt based on his own experiences, the man had been involved in some form of scandal, before he committed suicide nearly three years ago.

This information could be wrong as the Lineage Ligno potion had no date of death, though there was a blur were it should have been; there was a possibility the man was alive. With just a bit more digging, Harry found that Sherlock Holmes was almost always found in the company of honorably and medically discharged Army doctor John Watson. After that it didn't take long for Harry to find the man's blog which told the exploits of the two men.

As he read more about Sherlock it was clear that they had the same eye for details, and the same knack for finding danger and that they even looked similar with dark messy hair, and thin aristocratic features. Most importantly however, he found that Dr. Watson believed that Sherlock was innocent of the fraud and crimes he supposedly committed. Harry finally tracked down Doctor Watson at his place of work, and quickly made an appointment using his shoulder as a reason to see him.

LLFHOLLFOHLLFHO

Harry was startled out of his reverie by a nurse calling his name.

"Harry Potter, we're ready for you." She said with a smile and a gesture to follow her.

Harry took a deep breath and braced himself to see the man who many claimed to be his father's best friend.

A/N: Well here is the first chapter, I hope it was okay! There was not much dialogue but this chapter was just setting the stage so to speak, and there will be more dialogue in future chapters. Also I have a POLL on my profile page that will help decide John's romantic interest (Sherlock or Greg) and whether or not Sherlock should return, please help me decide!

Thanks for reading,

Godiva9