Title: The Hogwarts Effect

Author: Knife Hand

Feedback: Constructive feedback appreciated, flames unappreciated

Spoilers: Nothing Specific. Mass Effect 1 I suppose.

Rating: MA

Disclaimer: I do not own Harry Potter or Mass Effect... I would buy them all but I am broke.

Summary: Harry Potter is not raised by his Aunt, instead he is raised by his Mother's Cousin and his friends on a little ship called the Normandy. Harry Potter Mass Effect Crossover

A/N: This Fic ignores the Storylines of Mass Effect 2 and 3. Don't get me wrong, I love the games, but Harry is raised by the crew of the original SSV Normandy SR1, so no Collectors and no Reaper invasion… at least not on the timeframe of the Games.

Little Whinging, Surry, was a conservative neighbourhood, and no street was a conservative as Privet Drive. If given the choice, the residents of Little Whinging would like to pretend that the last forty or so years never happened. No discovery of Prothean Archives on Mars, no First Contact War, no Alliance, no Alien Species, no Citadel and their Council.

Given that, an Alliance Marine walking down Privet Drive, even if he was in the more casual of the Alliance uniforms meant for daily wear around a spaceship, was a big talking point. Or would have been had anyone seen him. It was two pm, so almost all of the residents of Privet Drive were at work, and the Housewives at home were watching their favourite Soap Operas.

The Marine walked up to Number four and the door opened before he could knock or ring the bell.

"John." Petunia Dursley said as she opened the door, ushering him inside.

Vernon was at work and her toddler, Dudley, was asleep upstairs.

"Petunia." Lieutenant Commander John Shepard replied. "I got your Extranet message. What's the matter?"

"Lily's dead." Petunia replied. "They left her son with us, but I just… I can't John. I can't go through it again. I'm afraid I will turn bitter and hurt him."

John was Lily and Petunia's cousin, but the three of them had been close when they were children, John's mother Hannah often visiting the Evans Family when she and John were on Earth. Once John had spent eight months living with the Evans' when Hannah had been on a secret mission that even to this day he knew nothing about.

When Lily had gone to Hogwarts, Petunia had wanted to go too. She loved her sister and wanted to be there with her, but one of the Wizards had tried to Obliviate her to get her to stop making noise and had screwed it up, which is why Petunia had moved into Little Whinging's isolationist community. The damage from the botched Obliviation had been permeant and caused her to uncontrollably fear everything Magical.

"Alright." John said. "But I need to get authorisation, because I am being deployed soon on the Maltase. Can I use your Extranet Link?"

Petunia nodded, and showed John to the hidden Extranet terminal. When John Shepard left Little Whinging a half hour later, he was carrying little Harry.

"How's that, Aunty Tali?" Harry asked.

Harry was ten years old, and he was up to his elbows in the inner workings of the Normandy's Ezzo Core.

"That got it." Tali replied in the slightly odd cant of a Quarian. "The damn converter was being a Bosh'tet. We never had these problems with the original Normandy."

Harry pushed off against a strut and the wheeled trolley rolled out from small engineering tunnel. Tali had been monitoring the systems while Harry had been replacing the converter. Getting up from the trolley, Harry gave the Quarian a celebratory hug, only coming up to her waist.

Tali ran her two fingered and one thumb hand gently through Harry's hair. Harry had taken to the, then teenaged, Quarian when he had first met her eight years ago when she had first come aboard the original Normandy in the hunt for Saren. The sight of two year old Harry following Tali around engineering had been endearing to the crew. Tali's Omni-tool beeped and she stepped back from the hug as she checked it.

"Your father has called a meeting." Tali said. "He wants you to head up and look after your Sister."

"Ok, Aunty Tali." Harry replied.

He headed out of Engineering and to the elevator to take him up the seven decks to the top deck which had the Captain's Private Quarters to the aft and the Captain's Ready Room, which was John's working office and a space where the crew could bring any issues to him.

The door to the Captain's Private Quarters opened for Harry, given that he was Captain John Shepard's adopted son, and on his second step in he stopped as a small blue missile wrapped around his body.

"Harry!" Leanna said as she hugged her adoptive older brother. "Where were you?"

Leanna T'Soni Shepard was the Asari daughter of Capitan and Spectre John Shepard and his Asari wife, Liara T'Soni Shepard. She had just turned six and was absolutely dedicated to her big brother.

"I was helping Aunty Tali with the Ezzo Core." Harry replied. "What have you been up to, Smurf?"

"Mummy was reading with me, but then she had to go to the meeting with Daddy." Leanna replied. "Will you read with me?"

"Ok, go grab a book from your room." Harry replied.

Leanna bounced and clapped in joy as she ran off to her own small room while Harry moved over to the couch in the small living room. The Quarters was a small three bedroom apartment that had been specially designed for the Shepard family when this Normandy was built.

The original Normandy had served nobly for six years in the Alliance before the new Normandy had been built, to the specifications of John Shepard and his senior crew and Specialists, given the missions they had been going on and John's Spectre status. The design, some three times the size of the original, became a template for a new class of ships to be commissioned in the Alliance as well as Turian, Asari and Salarian Militaries.

The Normandy would still be unique as it had specialised Quarters for both Tali, providing sterilised conditions for her weakened Quarian immune system, and Urdont Wrex, providing the Krogan Warmaster with more room than regular quarters. The Original Normandy had not been scrapped though. It had been 'sold' to the Quarian fleet for one credit.

Leanna came running back out holding a book and settled down on the couch next to Harry, snuggling into his side.

"So… what is it today?" Harry asked. "Humm…'Searching for the Flotilla'. Aunty Tali gave you this one, didn't she?"

Leanna nodded against his side.

"Yep." She replied. "Mummy and I are reading 'Arloch's burning' that Uncle Wrex got me. Though Mummy reads it first to make sure it does not get too…. Krogan for me."

"Ok, Smurf." Harry replied.

"I like Smurfs." Leanna said musingly. "They're like little male Asari. Except Smurfette, she's a little Asari, but with hair. I like her hair."

Harry, Leanna and Tali were one of the Normandy's shuttles as they transferred across to the Quarian Vessel the Neema.

"Chief, we're being hailed." The pilot said.

"This is Tali'Zorah nar Rayya Vas Normandy." Tali said over the comms. "Transferring to the Neema with Harry Shepard nar Normandy and Leanna Shepard nar Normandy."

"This is the Neema, you are cleared for docking." The Quarian on the radio confirmed.

"Confirmed, Neema." Tali replied. "As always, we will need to be met by a decontamination team."

Tali had some leave up as Chief Engineer of the Normandy, handing it over to Engineer Adams who was co-Chief Engineer and in charge of Engineering whenever Tali was on a ground mission. The Normandy was going on a covert mission and both John and Liara decided it was best that Harry and Leanna spend the time on the Migrant Fleet instead.

The Crew of the Normandy were always welcome on the Migrant Fleet after stopping a Cerberus Attack and promoting the rights of the Quarians with the Council and the greater Galaxy, through lauding their efforts and Tali's contribution to fighting Saren.

The shuttle docked, letting the trio off into the outer airlock before returning to the Normandy. Harry and Leanna were in full hardsuits, though lacking the combat protection that their parents wore, with clear visors. The decontamination team quickly entered and did their work before letting the trio into the Neema's interior.

One of the crew members welcomed them and showed them to their quarters for the visit, all three of them being quartered in the same rooms. A few minutes after they arrived there was a chime at the door.

"Tel'Herra." Tali greeted the Quarian woman at the door.

"Tali'Zorah." The woman replied. "Can we come in?"

Tali stepped back and Tel'Herra entered, followed by a young Quarian in an environmental bubble, rather than a Suit.

"Reli'Herra!" Leanna called.

"Leanna'Shepard. Harry'Shepard." The young Quarian replied, walking to roll the bubble over towards the two other children, putting her hands against the bubble when she stopped.

Harry and Leanna put their hands to the outside matching where Reli had her hands. Harry and Reli, being of similar age with the Quarian being slightly older, had been friends for years, with Leanna joining them as she got a bit older.

"How long are you going to be visiting this time, Tali'Zorah?" Tel'Herra asked.

"At least a month." Tali replied. "I love the Normandy, but it is good to be back with my own people."

"Oh good." Reli said, clapping in her bubble. "You'll be here when I get my first suit next week."

Harry blushed slightly at that declaration. Getting their first suit was a big right of passage for Quarians.

"Yah!" Leanna said, gleefully. "I call first hug."

Tali and Tel both looked on and chuckled at the antics of the children.

TBC…