A/N: I got this as a challenge from Challenge King who you can find on the site. I've never done a crossover before, let alone one that involves Grey's Anatomy and Harry Potter but the idea intrigued me so much that I just had to give it a chance. If you're not familiar with Harry Potter don't worry because whatever has to do with him will be explained in the story. It's a two-shot so it has two chapters. I WOULD REALLY APPRECIATE ANY KIND OF FEED-BACK BECAUSE THIS REALLY GAVE ME A LOT TO THINK ABOUT AND I TRIED MY BEST.

Callie Torres was a doctor. An orthopedic surgeon to be exact. And yet none of her knowledge and experiences could help her wife, Arizona Robbins, who has just lost her leg. To make it even worse Arizona thought Callie was the one to make the cut after promising Arizona will keep her leg. After all she did have a plan saving it. But as the time flew by, the infection grew and Arizona crashed. Doing the only thing Callie could have possible do is save her wife. They would worry about the leg later. At least that's what she thought.

It's been a long battle between them. Battle of tears, violence and arguments. Nothing Callie did was making the situation better. Even their daughter, Sofia, was hurt by the whole thing. Callie ended up sleeping in her dead best friend's apartment while Arizona stayed in their apartment.

Callie was desperate to find a way to fix Arizona so she could fix their marriage, or whatever was left from it anyway. After a huge amount of research she found something or should she say someone. She didn't believe it at first. She felt something between shame and stupidity to even believe in something like that.

Harry Potter, magical healer. Only whom really need me, shall see this message.

As ridiculous as it sounded that's what it said. A one line appeared when Callie was browsing on the Internet. She couldn't close the tab because it kept re-appearing. She couldn't click on it either. Magical healer. Callie laughed at herself. Were people messing with her? Were they able to see the tears that came out of her eyes every time someone mentioned her distant wife or her dead best friend? Were they able to notice how she wasn't that much of a great surgeon anymore?

Callie closed her laptop lid and stood up. She needed to make dinner for Arizona and Sofia. They were spending their time together and Arizona ordered for Callie not to interrupt them. What kind of family did she turned out to have? Sofia used to have three parents that worked together to raise her and now she had two that were taking shifts with her.

Going through the mail Callie noticed a strange looking letter. Or maybe everything seemed strange to her. Ever since Owen told her that the plane crashed somewhere between Seattle and Boise her life hasn't been the same. And it may never will be.

She opened the strange looking mail and raised her eyebrows. It looked like an old, original Egypt paper. And it seemed like it was written with an extremely old fountain pen. It held the same one line that Callie received on her laptop. What kind of sick joke was that? She decided not to mention it to anyone just yet.

Callie eventually started working on dinner as she had nothing else to do. She missed just sitting on the couch with Arizona laying across her lap and Sofia sitting on the carpet playing with her toys.

Arizona started working with her prosthetist David. She was getting ready to put on her first prosthetic but she refused to cooperate with him and only caused the process to be longer and more difficult. She was ignoring the world that existed outside of her pain. The only person Arizona really let to be around her was Sofia.

It was time for Sofia's nap just as Callie finished with dinner. She didn't cook like she used to. Not anymore. She used to do it so she could impress people but now she had no one to impress. She grabbed a tray of food along with a glass of orange juice. While Arizona was being hostile towards Callie, the brunette still loved her. And the guilt that has been in her for months made no sign of disappearing.

Callie knocked on the door. Who knocks on their own apartment door? I guess she did. Once she heard a quiet come in, she crossed the front door. Arizona was sitting on the couch. Her stump covered with a blanket like always. And Sofia was on the right side of Arizona happily chewing on her cracker while mumbling something. "I brought dinner," Callie said and placed the tray on the coffee table. "Uhm are you putting her down for her nap or?"

Arizona didn't make an eye contact. She just stared in the front. "I can do it," she snapped.

"I know. I didn't say you can't," Callie tried to argue but she was too exhausted. She sighed and shook her head never finishing the thought she wanted. "You know where you can find me."

Callie froze when she noticed that Mark's apartment door was opened. She could almost swear she closed the door. "I need sleep," Callie said to herself. She slept on the couch. She only used Mark's living room, kitchen and bathroom. Everything else would seem wrong to her.

Something was different. In those two minutes while Callie was gone something has changed in Mark's apartment. It might be the piece of paper that sure as hell wasn't there before. Callie blinked hard and lied down on the couch. She didn't realize how tired she was until she fell asleep almost immediately.

That nap quickly turned into a seven hour sleep and when Callie realized the time she freaked out. It was long past Sofia's bed time and she wasn't even sure if Arizona was still okay. She also hasn't eaten anything yet and her stomach made sure to let her know that.

Going back to Arizona's... Her own apartment, she had to remind herself, she carefully opened the front door. There was no sign of Arizona or Sofia except for the only half eaten plate of food and the mess a toddler left behind. The first place she looked at was Sofia's bedroom. It was empty. "Don't panic," she said to herself. Then she checked the bedroom. A night light was on which gave just enough brightness so that Callie didn't have to turn on any other light.

Arizona and Sofia were cuddled up together on the hospital bed Arizona still had. She was told to start using her own bed but she refused and Callie didn't want to push it. She covered them with the comforter and watched them for a minute. She used to be the one cuddled on the other side. But not anymore. And maybe never again. Callie felt tears burning in her eyes and turned around before she would lose her strength of stopping them.

She went back to Mark's apartment and lied back down on the couch. She wanted to turn on the TV or play loud music but she also just wanted to curl in a ball and cry. Then she remembered the mysterious paper and stretched her hand out to grab it.

If you ever feel like it's all too much visit the tunnel of hope on the 23rd street. I will be waiting.

What tunnel of hope? And who will be waiting? Callie needed to tell someone about these creepy notes she kept getting. A pen was laying on the table that was next to a paper before Callie picked it up. It seemed like a regular pen but she didn't own it.

She swirled the pen in her hand. "Who are you?" she asked out loud. Maybe the creepy stalker could hear her as well. After she didn't receive an answer she realized she was being crazy. "Please stop. Whoever you are. If you can hear me of course."

And yet somehow the tunnel of hope kept ringing through her ears. She lived in Seattle since the beginning of her internship and she has never heard of tunnel of hope. Nor was she ever on 23rd street. Bad reputation of that neighborhood along with her busy schedule never gave her an opportunity to explore.

The next day Callie went to work, dropping Sofia in daycare like she did any other day. But at the age of three Sofia was being very clingy and leaving her alone was much harder than usually. The day already started horribly with an argument between her and Arizona which made Sofia upset and throw a temper tantrum.

"Rough day?" asked Derek sympathetically.

Callie nodded and ran her hand through her hair. Her features were sad and tired. She couldn't even hide her emotions because they were written on her face. "But we are still doing a research on your hand." She might have failed as a wife but she refused to fail as a surgeon.

Derek looked at Callie. "We can reschedule it."

Callie raised her eyebrows in confusion. "Why? I have no surgeries to do and you can't operate either so none of us is busy." Also she needed some distraction from everything.

"I just thought you could use some rest." Callie shot him a glare that almost made him wince. "Or not. Why don't you show me what you got so far?" Derek changed the subject before Callie could feel offended. If work was what she needed then he's gonna make sure she will have plenty.

Derek went in the skill lab first to teach some young doctors and Callie needed someone else on her research for him. "Pretty boy I need you on my research for Derek."

Jackson looked at her and waved with his pager. "I've got my own cases."

"Yeah well the biggest neuro surgeon in the states is unable to operate and every second we spend here arguing his nerves are dying a bit more," Callie said in a voice that even Jackson couldn't resist even though he did open his mouth to argue. "Ops his nerve died just a little bit more. Chop, chop."

Jackson and Callie spent the next two hours searching for ways to fix Derek's nerve and they found quite a lot. "We did a lot so you just sit down and agree to one of this," Callie said when Derek showed up in the x-ray room.

Derek sat down and crossed his arms over his chest. He listened to their representations hating each and every one. Callie groaned in frustration. "I am trying Derek and if you don't like anything then I don't think we can do much. Either help us or we're done. I have enough of this at home as it is." She didn't mean to snap but it was all too much for her and her tired brain.

"We are throwing all these researches away. Each and every one," Derek said and pointed to the big pile of papers. Callie gasped. "And we start all over tomorrow. And I will help you."

Callie furrowed her brows in confusion. "So what do I do now?"

"You go home and take a break."

Callie sighed and nodded at Jackson to let him know he was free to go and do whatever he wanted. But Callie couldn't go home yet. "Hey, do you mind taking Sofia with you? She's been nagging about having a sleepover with Zola for a while already."

Derek nodded. "I'll let Meredith know to take both of the girls home. Are you and Arizona still not talking yet?"

"Just screaming or ignoring each other," Callie said with a sad smile. Derek rubbed her shoulder with his good hand.

"Get some rest and I'll see you tomorrow. If you ever need a place to stay you can stay with me and Mer. Or with Alex in the old house." He knew she was spending her days in Mark's apartment and he was with her when they watched him flat line and couldn't do anything about it.

Callie didn't say anything as tears pooled in her eyes and she was afraid they would spill out if she just opened her eyes. So she gave him a small nod and almost ran out of the room. She didn't want to go home. Not yet. Because it would include her and Arizona yelling at each other. She stuck her hands inside of her jean pockets and felt something. She pulled it out. It was the same paper she found on the coffee table.

"23rd street?" she questioned herself out loud. Would it hurt checking it out? She sat in her car and drove to the 22nd street and then to the 24th but she simply couldn't find it. It was most likely a sick joke. She parked her car to look at the map. She reached over and pulled the map under the passenger's seat. When she leaned back in her seat her jaw dropped. Her car was park right in front of the sign that said 23rd street.

She stepped out and held the cold tightly to her body. The wind was oddly strong. There was some sort of under bridge tunnel that she had to go through and it was dark. It seemed like hours since she made it to the other side and she watched enough scary movies that she thought she would die. When she turned around the tunnel said Tunnel of Hope. But why wasn't that sign on the either side of tunnel so people could actually see it? She shrugged to herself and noticed that there were houses built in a circle and she had no where to go or enter the house or turn around and go back to her. Tunnel of hope? She walked through it but nothing was there. So why did the paper said she could find someone there? Callie took a deep breath and entered the only building that didn't have a name written above the door. "Hello?" she called out.

It was bright in the building and there were steps leading up and only one door was in that level. She tried to open it but it was locked so she walked up the stairs. And the next stairs. And the next. The longer she walked the more stairs they were and there were no door on each level. "One more and I'm turning around," she told herself as her heart was beating rapidly in her chest. Her hands were clammy and she was really nervous. She didn't know what to expect. She pulled out her phone. No signal. "Great so if someone murders me I can't even reach anyone."

"Ma'am," a male voice said making Callie jump and freeze. She honestly didn't expect anyone to be in this building. She turned around and looked at the man. He had round glasses, over-sized shirt and washed out jeans.

"I'm sorry, I think I got lost," Callie said awkwardly.

The man nodded though he didn't seem convinced. Something on him gave Callie a weird vibe. Not that she should be afraid of him but that she might have to watch out anyway. "Only whom really need me, shall see this message," he said reminding her of something she's seen or read before.

Callie awkwardly cracked her knuckles on her hands. "Excuse me?"

He stepped closer and reached out his hand. "I'm Harry Potter."

"And I'm Callie Torres?" Callie asked more than stated as a fact. She was too confused on what was happening.

Harry understood her hesitation. He saw it every time someone came to him. "Follow me please." He walked just another flight of stairs higher and opened his door. He was on the very top.

Callie followed him anyway and stepped through the door. The room seemed very different. There was an enormous pot along with dusty books. Where was she? "Uhm were you the one who left me messages?" That seemed very stalkerish but she didn't know what also to say.

"Yes. I sensed that you might need my help," he said in his British accent. Not all people come to see him. Only the ones who are really desperate to get help and fix their problems. "I know what happened," he continued.

"What happened?" Callie asked confused.

Harry took a moment. "I'm a wizard who's profession is magical healing. I can help you with your wife's leg."

Callie stared at him wide eyed and then began laughing. There was this boy who seemed no older than 25, telling her he was a wizard and he could help Arizona with her leg. Not even her doctor could help her. She laughed for a long while before she finally calmed down. "That was really funny. I'm gonna go now."

"I can prove it to you," he said and raised his wand.

Callie let out another laugh. "Don't change me into a frog," she said sarcastically and waved her hands in the air.

Harry said something that sounded Latin or maybe he was just making words up, and waved with his wand. Callie wondered whether she lost her mind or maybe he lost his mind. But then she felt her phone vibrated and looked at it in a panic. Her signal was back. And her battery was full even though she hasn't charged it in a day. "Okay what's your secret trick?" Callie asked looking around for another person to jump out and scream syke.

"There is no secret," Harry said in all seriousness. He got the same reaction from many people before. He grabbed a piece of paper and showed it to Callie who gasped. Probably because a picture on the paper was moving.

Now Callie begin to feel uncomfortable and embarrassed. Was she really that desperate to fix Arizona that she was ready to do this? She didn't want to read the paper but her eyes scanned through the sentences and one caught her eye. "Magical prosthesis? What kind of joke is that?" She was an orthopedic surgeon. Bones, muscles and skin didn't just magically grow back.

Harry pointed to a chair. "I understand what you are going through and you shouldn't be ashamed to feel this way. I send the same message to twenty people a day and not all show up. I understand why you are hesitant but you shouldn't judge before you don't try it."

"So what you want me to ask my wife who is hating my guts right now to come with me so she can get a magic prosthesis?" Callie muffled another laugh. It was unreal and silly.

Harry nodded. "I need you to give her this potion." He opened his hand and a small bottle with fluid was laying on it. "It tastes and looks the same as water. But if you put just a drop in a regular water she will do anything you would have asked her."

Callie didn't want to take it. Even if it would work not that she believed in magic it felt like she would be betraying her wife so they wouldn't argue for a day. "I can't take this. It's not fair."

Harry nodded. "I understand that but please take it. just in case." It was almost like he forced Callie to take the bottle. She slipped it in her coat pocket and silently hoped she would lose it somewhere. This was a bad idea.

"Can I ask you something?" Callie asked before she wold leave.

"You can ask me anything you want," Harry responded with a smile on his face. He tried to come off as polite and friendly so people wouldn't get scared away immediately.

Callie fidgeted with her hands. "Why are you doing this? I still don't believe in magic and this is all very weird."

Harry expected some questions and this was one of them. "I wanted to share what I learned by helping people. I lost my parents when I was a baby. Another wizard killed them and left me this," he said and lifted his hair to show off his scar. It was unlike any other kind of scar Callie has ever seen. "And prove to the world that not all magic is evil. People deserve second chances."

Callie didn't quite understand his answers. "What if this doesn't work?" she asked almost whining. She really just wanted to go back to the way it was.

"I promise you that if you are willing to try it will work. It always does. Keep the bottle close to you."

Callie reached in her pocket and noticed it was still there. "Why does this give me hope? I shouldn't believe in this. Not anymore." She was too old. Too grown up.

Harry smiled. "Magic is not limited to the age, Callie. Everyone can believe in magic. You should go home. Your wife is questioning where you are."

Callie looked at the time on her phone. It wasn't that late. "But how?"

"She loves you. And she's sorry. I can tell. But her trust was robbed. She understands you did it to save her life, though that does not mean she accepted it just yet. But she's making progress."

Harry sounded so sure and it made Callie believe him. It made her feel better. "I can always find you here?" she asked right after she stood up.

"Always," Harry replied. "But like I said it. Only whom really need me. You have to believe to see."

Callie squinted at him but decided not to say anything else. She walked to her car and felt much calmer than she did when she came here. Was she going crazy? Was this some sort of weird dreams? She sat in her car and without a second look back she drove away. No, it wasn't a dream.

She made it home half an hour then she would if she stayed at work. Sofia was at Meredith so tonight it was just her and Arizona. Callie took a deep breath and reached for the door knob of her apartment. She didn't want to be completely alone. She heard a faint come in and opened the door. "Hi."

"Hi," Arizona said back through a shaky breath. She would have never imagined that it would be this hard to say hello to the love of her life. "You're early."

"Uhm yeah Derek sent me home. We're doing a research for his hand and he said we'll start tomorrow so I'm free. Sofia's at Meredith. She's been asking about if for a while now."

Arizona nodded. "I know." This was good. Small talk with less than three words coming from her side. "Uhm do you want to watch TV? American bake off starts in five minutes." She kind of surprised herself when she let out the suggestion but she meant it.

Callie had to stop herself from gaping in surprise. "Yeah sure." She dropped her purse in the corner and stepped further in the room. She wasn't sure where to sit nor what to do. Arizona saved her from her hesitation when she slightly pulled back the blanket that was covering her stump. Callie sat down and leaned her elbow on the back of the couch as Arizona turned on the TV a bit louder.