Disclaimer: I do not own Supernatural or Harry Potter. Both are owned by their rightful owners. The only thing I do own is the plot for this story :)

"Freak!"

Hermione sobbed as the words hit her like physical blows. She hadn't meant to make the boy's hair turn a violent pink colour but he had took her book off her and had been teasing her with it so she had threatened to turn his hair pink. He hadn't stopped so she had thrust her hand out and the next thing she knew, the boy's hair was pink and he was staring at his reflection in the window next to him. Hermione had run but the boy and his friends had followed. Now she was curled up behind a park bench, watching the boys get closer.

"Go away!" She cried as the boys advanced towards her. "Please! I didn't mean to do it!"

"You're a freak!" The pink-haired boy snarled, grabbing her by the wrist painfully. "Wait until I'm finished with you!"

Hermione closed her eyes as she waited for the boy to do whatever he planned to do. They snapped open again though when she heard an American, deep, masculine voice.

"Leave her alone."

Hermione stared up at the man stood next to the boy. He hadn't been there a moment ago and she knew it. The boy jumped and turned to stare at the man too. The man was quite tall, compared to Hermione's 10 year old form, and he wore black trousers, a white shirt and a tie. Over it all, he wore a trench coat. He had pitch black hair and bright blue coloured eyes. There was a powerful aura around the man and Hermione knew he was someone not to be messed with.

"Why should I?" The boy argued, letting go of Hermione and folding his arms. "She's a freak!"

The man stared at the boy for a moment before answering in a casual tone, "Yes. She is a freak."

Hermione sobbed again as the boy grinned at the man. This man thought she was a freak too. Hermione got ready to run again but the next words out the man's mouth made her stop.

"But I'm a freak too."

The boy trembled as suddenly lightning lit up the sky and the outlines of wings were seen unfurling from the man's back. The boy and his friends ran off, crying and screaming, but Hermione stayed put. This man had helped her.

The lightning disappeared and the skies turned back to the way they had been before, a light blue colour. The man turned to her.

"Are you alright, Hermione?" He asked.

Hermione nodded shakily before asking, "How do you know my name? What are you? Who are you? Why do I keep doing these strange things?"

The man kneeled down in front of her and said softly, "I'm an angel, Hermione. I've been assigned to you to protect you."

Hermione's jaw dropped before she shyly lifted a hand to the man's face. She touched the man's cheek cautiously before nodding to herself.

"Really? Like a guardian angel? But why?" She asked, biting her lip.

The man smiled grimly before replying, "Yes, I suppose I am your Guardian Angel. We'll get to why in a minute. First, you asked my name. It's Castiel. But a friend of mine started to call me Cas. You may call me that too."

"Ok Cas." Hermione said brightly, sitting down on the park bench. Castiel followed her and sat next to her. He took a deep breath before starting to talk.

"I'm your... Guardian Angel as you put it... because you're going to have a very dark and dangerous future, Hermione. You're a witch. That's why you can do things like turn that boy's hair pink." Cas explained, looking down at her.

Hermione's eyes widened before she nodded again. She had always known she was different and this explained it.

"When you turn 11, you'll get a letter from Hogwarts School of Witchcraft and Wizardry inviting you there to go learn to control your magic. Once there, your future starts to get dark. That's all I can tell you at the minute. But that's why I'm here. I'll help you." Cas smiled softly down at Hermione and Hermione grinned back. Cas told her, "You can't tell anyone about me Hermione. No one can know about me being an angel. If anyone sees us, you'll have to tell them I'm a friend of your family."

Hermione nodded seriously before hugging the angel tightly. "I won't. I promise. Thank you for saving me from those boys."

Hermione felt Cas tense in her arms before relaxing and hugging her back. He let go and got up. "Come on. I'll walk you home and tell your parents what happened with the boys. Your parents can know about me. I'll explain everything to them."

"Mum! Dad!" Hermione raced into the house to find her parents sat at the table, looking shocked. Cas was stood in the corner, looking round the kitchen casually. Hermione had been sent out while Cas had been talking to her parents and had just been called back in.

"Please say you believe Cas! Did he show you his wings? They're massive aren't they?" Hermione fired questions rapidly, grabbing hold of Cas' hand. "Please believe him! He saved me!"

Jean Granger cleared her throat and said weakly, "Yes darling. We saw them. We believe him. I suppose this explains all the odd things you've done."

Hermione cheered and hugged both her parents before Cas asked to speak to her before he left. He led her outside and hugged her gently before telling her. "I have to go now. I have things to do. My friends need my help with hunting a demon."

"A demon?" Hermione asked, shocked.

"Yes. Perhaps one day you could come with me to meet my friends. I've told them all about you. Their names are Sam and Dean Winchester and they want to meet you at some point." Cas told her, smiling.

"Oh! I'd love to go one day!" Hermione breathed, eyes alight with excitement.

"Yes, but not today. Not until you've started Hogwarts at least. Anyway, if you need me just call my name and I'll be there as quickly as possible. Keep safe, Hermione." Cas ordered her before disappearing with the sound of wings.

Hermione bounced as she opened her last birthday present and found a new book. She hugged her parents excitedly then sat down to read it. It had been 7 months since she had first met Cas and found out about being a witch and having Cas as a guardian angel. She hadn't seen Cas since that day but she wasn't worried. She knew that he would be busy with his friends, Sam and Dean, if they were hunting a demon.

Hermione's reading was interrupted by a knock at the door. She heard her mother answer the door and talk to someone in quiet voices. A moment later, her mother entered the room with a woman following her.

"Hermione, Dear? This is Professor McGonagall. She's from a school called Hogwarts and she can do what you can do." Hermione's mum told her, trying not to smile since she knew all about Hogwarts and magic thanks to Cas.

"Oh!" Hermione jumped up, pushing her book aside. "It's nice to meet you Professor. Is your school for people like me?"

McGonagall smiled slightly, "Yes, Miss Granger, it is. We would like it if you attended Hogwarts, starting from September 1st as a first year. Here's your letter."

Hermione took the letter excitedly and opened it before reading it. After she had finished, she frowned. Cas hadn't told her where to get all her stuff.

"Professor? Where do you get all this stuff?" She asked, looking up at the woman.

"Ah there's only one place for all that. It's called Diagon Alley."

Hermione sat down on her bed tiredly, grinning. She had just got back from buying everything she needed for Hogwarts from Diagon Alley. She had a sudden thought. Did Cas know she had her letter? Should she call him? Would it work? Well there was only one way to find out.

"Um... Castiel? Are you there? It's my birthday and I got my Hogwarts letter today." Hermione spoke to the air in front of her, feeling foolish. What if it didn't work?

"Happy Birthday and Congratulations."

Hermione yelped as Cas' voice came from right beside her. She turned to see the angel sat on her bed with her, smiling slightly. She rubbed her chest where her heart was pounding from the surprise.

"Jeez, Cas. You scared the living daylights out of me!" Hermione told him, laughing.

"I'm sorry. Are you ok?" Cas asked as he looked round her room, his eyes lingering on her massive bookshelf.

"I'm fine. Just... Just appear in front of me next time so I know you're there ok?" Hermione suggested, getting up. She grinned as she pulled her new wand out. "Look Cas! I got a wand! I can't wait to go to Hogwarts!"

Cas chuckled at her before nodding, "I see that. I will keep an eye on you while you're there, of course. The wards set up there won't stop me from getting in to the castle if I need to. Oh what now!"

Hermione jumped at Cas' frustrated tone as he snapped the last sentence. He closed his eyes for a moment and when he opened them, he was frowning.

"It seems Dean and Sam need me for something. But I wish to stay and talk to you." Cas admitted, still frowning. He sighed and told Hermione, "Go ask your parents if you can come with me for an hour or so. Tell them you'll be safe."

Hermione did as she was told and soon she was back, smiling, and saying, "They said it was fine. Where are we going?"

Cas smiled at the excitement in her tone before wrapping his arms around her protectively.

"Hold on Hermione. We're going to America. You're going to meet the Winchesters."

Hi guys! This is my new fan fic and it's a crossover between harry potter and Supernatural. Please review, favourite and whatever else there is to do! XD I'm really busy with school at the moment so updates might be slow but the next one will definitely be up by the end of January :) Thank you for reading! ~ Phoebe x