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.

Hannah Shepard's cabin in the Canadian Rockies was warm thanks to the roaring fireplace in the main living room and the hypocaust underfloor heating system styled after the Roman model. The log walls and rustic style furniture gave it a 'frontier' and 'primitive' feel, but the cabin was well constructed with no drafts and housed some of the most advanced technology for hundreds of kilometres in any direction, which included two major towns and a Canadian Military Base. In Hannah's office there was the latest computer system and a full communication suite and the barn out the back held a personal shuttle. There was also a hardened bunker under the cabin that could withstand a Nuke or a Kinetic strike Kill (a solid 1kg rod that is dropped from orbit with similar kind force as a Nuke).

It was three in the morning and everything was quiet when the creaking of the door to his room opening woke Harry. Opening his eyes, he saw the silhouette in the doorway which he immediately recognised.

"What's up, Smurf?" Harry asked sleepily.

"Can I sleep with you?" Leanna replied.

With a nod, Harry pulled back the covers. Leanna walked in, clutching her stuffed unicorn in her left hand and the pint sized plastic Valkyrie Assault Rifle in her right. While their dad had gotten Leanna the unicorn, no one knew who gave her the plastic Rifle, though Garrus and Wrex were the prime suspects.

With a very deliberate move, Leanna moved over to the bedside table and placed her rifle down, stock end to the floor, and leaned it up against the bedside table. She had seen their dad do that action many times after returning from a mission. After this, Leanna crawled into Harry's bed and snuggled into the side of her beloved brother.

"I missed you." Leanna said sleepily.

"Me too, Smurf." Harry replied before he dropped off to sleep.

Aria awoke to the sound of her door closing. That should not be happening with her Guards, security systems and such. It had only happened twice before.

"Lights!" she shouted as she jumped from the bed and took a defensive fighting stance.

Seeing who was in her room she relaxed. At least it wasn't that damn Salarian who was a chatterbox, even by Salarian standards.

"Shepard." She said. "The little wifey and your pet Quarian."

Liara glared at the self-proclaimed Pirate Queen while Tali's stance was aggressive.

"So… to what do I owe this visit?" Aria asked arrogantly.

Shepard was a boy scout and she kind of enjoyed the last time he had decided that she needed some punishment. Not that she would ever admit it.

"The Normandy was attacked by Pirates." Sheppard replied. "Pirates based on Omega."

"So?" Aria said nonchalantly. "Why does this concern me?"

"You mean besides nothing happens on Omega without your knowledge?" Shepard asked. "Maybe because I am supposed to be spending time with my son who has just come back from boarding school but instead, I am dealing with the fallout of the attack."

Be with his son… oh shit. He was here instead of with Harry. This was bad. This was not going to sitting gingerly for a few days, the fun kind of punishment; this would be prosthetic limb replacement or body bag kind of punishment.

Everyone knew two things about Shepard. One, he was probably the toughest soldier in the Galaxy, Krogan included. Two, he would do anything for his two kids. The few who had threatened Harry or Leanna were swiftly and brutally dealt with and their fate used as a very effective deterrent for anyone else ever trying it again.

Fuck, that explains the Quarian being here too because she was way too overprotective of Harry. That story about Tali tearing apart an entire space station just to kick a guy in the nuts because he had insulted Harry was almost certainly untrue, but even the stories Aria could verify relating to Tali were scary when it related to Harry.

"I did not order it." Aria said quickly. "I don't know who did it, but I will find out."

"You better." Tali threatened.

The Normandy trio walked out of her quarters. After a second to gather herself, Aria walked to the com unit on the wall.

"Bray!" she ordered.

"Yes Aria?" Bray replied.

"There was an attack on the Normandy. From here. Find out everything about it." Aria ordered. "And rotate my guards then kill the current lot."

Harry and Leanna came down for breakfast together. Leanna had left her unicorn and toy rifle in Harry's room as they were her night time security blankets.

Hannah was already down in the kitchen when they arrived, looking over a data slate as she sipped her coffee.

"Good morning." Hannah said.

"Morning Oma." Leanna said, running up to sit in Hannah's lap and giving her a Hug.

"Harry." A quiet voice said from beside him.

"Morning Reli." Harry replied. "How did you sleep?"

"I… um… well… fine." Reli replied. "There were some temperature fluctuations, but I don't think it was my suit."

"No dear." Hannah said. "The outside temperature fell dramatically last night. We had about six inches of snow. The heating system struggled to keep up."

"What is snow?" Reli asked.

"The coolest thing ever!" Leanna exclaimed.

"Water droplets freezing in a fractal pattern then precipitating from the sky." Harry said.

"You got that from Auntie Tali!" Leanna accused as she went to the cupboard near the door where the cold weather gear was stored.

"Reli, do you want to see the snow?" Hannah asked.

"Yes, Admiral." Reli replied nerviously.

"Reli, you can call me Hannah." The older woman advised. "If you want, you can even call me Oma like Harry and Leanna do."

"Um.. Ok… Hannah." Reli replied softly.

"Come on!" Leanna said excitedly, having pulled on a jacket and scarf.

A slightly confused Reli followed Leanna and Harry, who were both now dressed in cold weather gear, out of the cabin and stopped in amazement. Everything was… white. All the trees and grass were covered in the pure white snow. Leanna ran forward and jumped into a snow drift where there had just been grass the afternoon before.

An hour and a half later Hannah emerged from the Cabin to call the children in. The front lawn was vastly different when they children had gone out.

"Time to come in, kids." Hannah called. "Harry, Leanna, you stay out any longer and you'll catch a cold."

Leanna skipped up to Hannah from where she had been finishing her snow figures and gave her Oma a hug. Hannah recognised most of the senior Normandy crew in the row of snow figures. Wrex was hard to miss and Garrus was quite well done, but the best figures were Tali, John and Liara.

Harry and Reli were making their way from where they had built their snow castle. And it was an impressive castle, which had cleared most of the snow not used by Leanna from the lawn. Almost three quarters the height of Harry and Reli, it had towers, palisades and a central courtyard. As they walked past, Harry and Reli were having a conversation about the construction of the snow castle, which sounded like a mix of advanced material physics and structural engineering. It was the kind of conversation she expected from her Quarian R&D team.

TBC…