An: Hi, everyone! First, I would like to thank TheFictionKittenfor allowing me to continue her already amazing story! I really enjoyed reading this story, and now I will really enjoy writing it! I would also like to thank all of you, weather new readers and old readers, for clicking on my story and giving it a chance. Now, I will be following the story line the previous author set, based on the information in the chapters she posted. After I get through with the information they set up before, I will continue the story the way I want to, with a little help from you guys here and there. I would also like to say that I am changing the time line, this all happens after The Blood of Olympus and right before the school year of the Order of the Phoenix. Now I've talked…or typed long enough, so let's get to the story!

Disclaimer: I do not own Harry Potter or Percy Jackson.

The Mix-Up in #12 Grimmauld Place (Adopted from TheFanfictionKitten!)

Chapter One: Sneaking In?

By FanGirl214

Nico's POV

I am pissed…and tired. Not only was I chased by monsters earlier, but then I was dropped off in a fountain who knows where, and then I am captured my some crazy stick waving maniacs. Okay, okay, let me explain a little:

So was walking to good old McDonalds for some food. Hey, eating in the Palace of Hades is all nice and fun, or dark and creepy, but you can't blame a guy for wanting a little McDonalds from time to time.

Anyways, I was walking to McDonalds and of course my cousin has to run around the corner and slam into me, knocking us both to the ground. I glare at him and open my mouth to ask what the hell was wrong with him, when he jumps to his feet, starts running, and grabs my jacket as he passes me, which ended up with me half running and being half dragged down the street as a pack of hell hounds charges around the corner.

"Shit, Percy! What the hell did you do?" I yell and stand up, running alongside him.

"Well-," He started.

I cut him off, "Don't answer that."

We ran for a while, killing hellhounds when they got to close just to have another one take its place, and we were soon out of breath. That was kind of hard to do since we were used to running and trained as often as we did.

I stumbled a little but continued running, "Damn it, Kelp Head, this is all your fault!"

"What are you talking about!? How is this my fault, Death Breath? Oh, wait, it kind of is…" He rubbed the back of his neck and gave an apologetic smile, "Sorry, dude."

I roll my eyes, "With more of these things showing up every time we kill one, and us being this tired already, we're going to die unless you don't come up with something! Out of all the things we've done you want us to die from this!"

He slashed a hell hound that almost landed on top of him, "Can't you just shadow travel us out of here?"

A hell hounds claws scrape the back of my right leg, making me growl and slash it into monster dust, "I can't Percy, I'm too tired from all this running to even shadow travel me, trying to transport both of us would end badly."

"Well, try or we'll be dog food!" He snorted.

I sigh, I knew he was right but I was never going to admit it. I grab his wrist and close my eyes and will the shadows to surround us and soon we were floating in the shadows. Suddenly his wrist slips out of my hands. No! I have to make sure he's safe, he's my only friend and has people who actually care about him. I think.

Somewhere safe, somewhere safe, somewhere safe! Camp Half-Blood or Sally's apartment! I watched the shadows cover him and felt myself drift a little before being covered completely. Where was I going to end up? I felt like I was falling.

"Wait a sec-" The rest of my sentence was drowned out, literally. I sit up and spit out water. I look around, I had landed in a fountain, in front of some houses. I groan as I stand up and stumble out of the fountain, it was taking all of my energy just to stay awake.

I limp toward the closest house, number 12, which for some reason was a little blurry. The gate creaks as I open it and then let it go, which ended with it slamming shut on its own. I walk through the small yard, blood starting to drip down my leg, leaving a small trail.

I open the door and walk into the old and worn down house. To a normal person it would seem like no now had lived here for years, but I was not normal. Even though it was the middle of the night in this place, I could see perfectly fine, and that meant I could see the many different footprints on the dusty floor, all fresh.

I leaned against the wall for a minute, trying to catch my breath. It didn't work, the longer I stood there the blurrier my vision got, the dizzier I became, the more blood I lost, and the closer I got to unconsciousness. I didn't have any ambrosia or nectar so I'd have to let my wound heal the normal way unless I can get some somewhere or shadow travel to a place I know would have some, but it was going to take me a long time before I can do anything close to shadow traveling.

I slowly started putting more and more of my weight onto the wall. My body was shaking with exhaustion but I tried my hardest not to pass out. I came in here so I wouldn't have to deal with tons of mortals, in here I'd only have to deal with a couple, but now I'm starting to regret it. I don't want to pass out and then wake up as someone's prisoner. I guess I don't have much of a choice as my knees buckle and darkness surrounds me, not in a good way this time.

Sort Of Third Person (In The Dining Room)

The Order of the Phoenix member sat around the dining table, which was usually their meeting room. Mad-Eye Moody was pacing around the room, basically yelling at everyone, "Our headquarters has been breached. Someone entered the building with no effects from and of the charms. They must be a spy!"

Mrs. Weasley ask, "What do you mean? You casted those charms yourself and said it would keep everyone out! What are we going to do?"

Everyone looked at Dumbledore, who said, "I think we should meet the person who broke in."

Somehow Tonks, Mad-Eye, Arthur, and Sirius ended up going to meet this strange person, who broke in without being affected by the magic at all. This person was strange indeed, they didn't expect to see a bleeding fourteen year old boy, with white skin and long raven black hair that framed his face. He was wearing black jeans, a chain belt with a black sword on it, a black shirt with a skull on it, a silver skull ring, and an old aviator jacket.

The bottom of his right jean leg was torn, revealing large claw marks from what, they didn't know. It was bleeding so much that there was a medium sized puddle of blood around his leg. His eyes were shut and he looked exhausted.

The four of them stared at him for a while in a shocked silence before Tonks finally spoke,

Mad-Eye didn't seem to care, because he roughly picked the boy up in a fireman's carry and started walking back to the dining room, "We need to talk to Dumbledore about this."

Nico's POV

When I first woke up, I lay there for a while with my eyes close, letting my body slowly come out of the darkness that was unconsciousness. At first, when I heard the voices and realized that I was on a table, I thought I was still out of it.

"What do we do with him? We don't have the supplies to take care of his injury, and he looks like he could barely walk even if he wanted to." A female voice said.

"Let's give him some Veritaserum. He's probably a spy, and is powerful enough to not be effected by the charms we set up." A raspy male voice said.

"He's just a boy! He needs food, rest, and treatment. Not someone he doesn't know interrogating him." Said the same female voice. I groan, partly from the pain and exhaustion, and partly because this woman thinks I am so needy.

"I think our guest is awakening." Someone said, their voice sounded old but wise, like Chiron's.

Then I remembered where I was, the not so abandoned house. My eyes shot open and adrenaline filled me. I did a kip up into a standing position and drew my sword, looking around with focused narrow eyes and my body ready for a fight.

I only noticed a few people around the dining room table. At the head was an old man with long white hair and a beard. Standing behind him was a short red haired woman, next to a tall red haired man. Then I saw a pink haired woman sitting next to a tall brown haired man, and him next to a man that sort of reminded me of my father. In the corner by himself was a gnarled looking man with a creepy eye.

"There's no need for that here, boy." The man in the corner said and I noticed that everyone in the room had a stick in their hand. I glared at him and let out a low growl, it didn't come out exactly how I wanted it to but it wasn't bad. The red haired woman seemed to think it was funny because she laughed, which made me switch me glare to her.

"Who are you people?" I mutter threateningly.

The old man answered, "I am Albus Dumbledore, who might you been young man?"

I narrowed my eyes even more, "The rest of you first."

The rest introduced themselves as Molly Weasley, Arthur Weasley, Mad-Eye Moody, Tonks, Remus, and Sirius. They all looked at me expectantly and I snap, "Nico."

"Nico….what?" Tonks asked.

"That's something you don't need to know, and something I really don't care to tell." I pause and look around, "Where am I?"

They gasped like it surprised them that I didn't know. That one sentence sent them all into conversation, which I heard bits and pieces of. "He didn't mean to be here?" and "How'd he break in then?" And "How'd he do it?"

Then the old man cleared his throat and everyone shut up, "Nico, may I ask you a couple questions?"

I shake my head and he nods, "Okay, may I ask you a question?"

I shake my head and he looks confused, this was going to be a long day.

An: Okay, I hope you guys liked it, I'm sorry it took so long for me to get it up, it takes me a while to type stuff up. Now, I have a fun question for you, I'm going to try and put one at the end of each update. Sometimes they will be PJO/HoO related and sometimes they will be HP related, but here we go: If the seven, plus Nico, Thalia, and Reyna, sang, whose voices do you think they would match up with. I only have a couple answers for this so we can fill it out based on you opinions and my judgment, so you can either tell me your opinion by review or p.m. This is just my list, what's yours? :

Percy: Chris Martin, lead singer of Coldplay.

Annabeth: Taylor Swift.

Jason: Brendon Urie, the lead singer of Panic! At the Disco.

Piper: Sara Bareilles.

Leo: Adam Young, the lead singer of Owl City.

Frank: Rob Thomas, lead singer of Matchbox Twenty.

Hazel: Christina Perri.

Reyna: Rihanna.

Thalia: Hayley Williams, lead singer of Paramore.

Nico: Dan Reynolds, the lead singer of Imag