Author's Note: This chapter was originally in my Rise of the Guardians fanfic, Child of Spring as a sort of interlude chapter. Now it is the beginning chapter of this very weird crossover fic. It's sort of a Rise of the Guardians crossover, but centers more around my fanfic universe in Child of Spring. So the Guardians characters might be a little OOC and acting strangely if you haven't read my fic. I HIGHLY recommend you at least read up to Through the Years Part 2, as it is during that time that this fic takes place in.

Consider this VERY AU from Harry Potter and Rise of the Guardians. It is also AU from my fanfic, Child of Spring. I just had a little plot bunny in my head and I had to write it out. I hope you enjoy!

Chapter One: Lillian Meets Harry

The first time Lillian had seen Harry Potter, had been when he was eight years old. It was just past mid-spring, and the weather was fine. The sky was full of sunshine with only a hint of clouds, and Lillian was wandering along Privet Drive, doing her best to beautify the neighborhood with her lovely Spring flowers.

She walked carefully along the edge of the grass near the sidewalk and looked back to see the effect she was having. In a long neat row, grew her spring flowers in all shapes and sizes, the colors a riot of random colors.

She smiled a little as she looked at it. It suited the neighborhood. It was somewhat uniform, but still random enough to give it that particular flair. She was careful to walk along the edge near the sidewalk instead of near the houses, since she knew some people liked planting flowers and things and she knew they didn't want anything interfering with their precious flower beds.

She had started at the other end of Privet Drive, and was glad that she would be done soon. She didn't really like this part of Little Whinging, with all its sameness and perfection. Life wasn't perfect, she reasoned, so why pretend it was? Perhaps it was for some sort of control, but she wasn't sure. She hadn't noticed much of anyone as she went about her business. It was the middle of the day on a Sunday. She had seen the occasional person watering said flower garden, but that was about it. Most people were either off doing their own things or inside. Some children were playing in their backyards, but most were probably off at the park.

That was why Lillian paused at Number Four, Privet Drive. She spotted a mop of dark hair moving near the house. She looked more closely and noticed it was a small boy drowning in clothes far too large for him. They looked pretty raggedy, and she could see that he had to roll the sleeves up several times so he could stick his hands out from them to tend to the flower garden.

Lillian hopped off from the grass to the front walk carefully with practiced ease and walked up it to get a closer look at this boy. Lillian tilted her head, wondering if she should write to Santa and suggest some new clothes for this kid. She watched him weed for a little bit, finding it a little odd that a kid so young would be out in the sun weeding a flower bed all by himself.

She shrugged to herself. Who knows, maybe the kid likes gardening. Finding his task pretty boring, she walked back down the walk and hopped back to where she had left off with her flowers.

She continued walking down the rest of Privet Drive and soon her Giant Flower of Doom was eating her as she took off without a backward glance. If little Harry Potter had looked up from his task, he might have spotted Lillian disappearing via her Giant Flower of Doom, but he was hard at work and only had eyes for weeds.

It was three years later before she saw Harry Potter again. She had been bored and not supposed to spread Spring now, since it was the end of July and soon to be the beginning of September. But she had been bored, and Jack was off in cold places and Pitch was..

She shook her head to rid herself of the thoughts. Pitch was.. he was fine. So what if he was a little distant? So what if he yelled at her more.. So what if she felt forgotten and a little unloved sometimes.

She thought of her bedroom, which she had started to leave messier and messier when she was in high school, and how Pitch never yelled at her like he would have done. She remembered when he would scold her to clean her plate, and how he would read to her at night and how right it had all seemed. She had a family.

Now she spent more time out of her home than in it, and she stayed out as late as she could before Sandy would catch her. She would always wake up at Jack's lake, and sneak back inside. Pitch had caught her a couple times, but mostly he didn't have much to say about her long absences. Sometimes Lillian almost wished Pitch would scold her, because that meant that he still cared.

Lillian had been walking along the sidewalk, her gaze down on the cracks as she walked around in her old mended pink dress. She realized the sidewalk had become blurry and she stopped to wipe her tears.

"Why are you crying?" a quiet voice asked her.

Lillian gave a startled yelp and almost jumped backwards at that. Her head snapped up and gray eyes locked onto emerald green. She saw a boy that was physically several years older than her, wearing baggy clothes that were much too big on him and was he dragging along a trunk and carrying an owl in a cage?

Lillian tried not to stare as she wiped more of her tears away and wondered how this boy could see her. No person outside of Halloween had ever seen her. She didn't want to admit it, but she was kind of freaking out.

"..Um.. um.. n-no reason," she said shyly. "Who are you?"

Harry gave her an odd look then, but didn't comment on it.

"Harry Potter," he finally admitted. "I live a few houses down the street. Where do you live?"

"Um.." Lillian said, stalling for him. "..A few blocks away.."

It was a pretty feeble lie, but the kid seemed to buy it. Lillian really wanted use her Giant Flower of Doom to get away, but she didn't want to scare this boy. What was going on?!

"Say, um.. Do you believe in.. spirits? Like.. The Spirit of Spring?" she asked Harry cautiously.

"Spirit?" Harry gave her an incredulous look, as no child on Privet Drive of all places would dare to suggest such a thing.

"Nevermind," Lillian said hastily.

Now this was really freaking her out. He didn't know about the Spirit of Spring and he could still see her?

She looked at Harry curiously and finally had to ask.

"Why do you have an owl in a cage?" she asked him.

"Er," Harry said, fumbling for an answer. He finally settled on a little bit of the truth. "I got her as a birthday present. I had to get supplies for this boarding school I'm going to and a friend bought her for me."

That brought Lillian's attention to Harry's attire. They sort of looked like clothes that someone who didn't want them anymore had thrown away. But the trunk he was dragging along laboriously looked pretty nice and the owl was one of the prettiest ones she'd ever seen.

"Aren't your parents going to help you take that stuff home?" she finally asked.

Harry looked distinctly uncomfortable and was heartily wishing he'd ignored the sad crying girl and been on his way. He forgot that children were always endlessly curious and apparently she'd latched onto him for her endless fountain of questions.

He mentally kicked himself for wandering around in public with an owl but all Hagrid had done was see to it that he got on the train back to the Dursley's, assuming that Harry's Aunt and Uncle would pick him up from the station. What Hagrid had failed to realize was that while Harry's Aunt and Uncle were most likely on their way home or already there, they would have no clue Harry would be at the station needing a ride and he hadn't any pocket money for the pay phone.

Harry wasn't entirely certain that they would have picked him up anyway if he did. Harry decided a little distraction with the truth would be in order. He could tell her that much and then be on his way.

"They're dead," he said suddenly and Lillian's eyes widened at that. "My Aunt and Uncle didn't know what time to expect me back, and I didn't have any pocket money for a phone to call them."

Lillian tilted her head as she looked at him, taking in the facts. Something seemed a little off about this picture, but then she shrugged. Maybe this was a normal thing for him?

She made to move aside as he trudged past her.

"Hey," she called out to him. "Do you want some help?"

Harry gave her a look of utter disbelief, as she looked barely able to lift the owl's cage, let alone one end of the trunk. Finally, he shook his head.

"I'm almost home," he told her.

Lillian watched him for a minute as he continued trudging on, then mentally shrugged to herself. She had enough weirdness in her life. She soon reached the end of Privet Drive and her Giant Flower of Doom ate her.

Maybe she'd go see where Jack was and what he was up to.

The next year, Lillian turned up at Privet Drive around the same time, just to see if she'd run into that Harry kid again and if he was lugging around an owl. Unfortunately, she had misjudged the time difference and it was pretty late at night. Still, she thought it couldn't hurt to take a peek and see if anything was going on.

So she walked down Privet Drive, and was thankful that either Sandy had already been through here or else hadn't been here yet, as she didn't see any sign of him. Just as she was nearing Number 4, she paused as she heard what sounded like a car. She looked up and down the street but didn't spot one. Finding this a little strange she looked around until a flash of something caught her eye.

Then she looked up and her jaw dropped. There was a car flying in midair!

She wondered how on earth that could be possible, when some of the conversation drifted down to her. It was night after all, and voices carried.

"..Locked me up and.. can't.. expelled..!" a young boy's voice exclaimed. He sounded familiar to Lillian.

"Stop gibbering," a second voice said, apparently from the car. "..you out.."

"But..! ..either..!" the first boy's voice said, trying to be quiet, and sounding very nervous.

"You forgot.. with me.." the second boy's voice said with a chuckle.

There was a little more conversation and then Lillian watched with interest as a rope was tied around the bars that were in front of the window.

Wait..

Bars in front of the window?!

Lillian's eyes went wide again as she took it in. No way. Who put bars on a kid's window?! That was not ok.

She frowned as she watched them shove a very familiar looking trunk out the window and into the car. Then she heard a loud screech and the boy in the room cried out in dismay.

"I've forgotten Hedwig!"

This was followed by a very loud bellow.

"..Ruddy owl..!"

There was soon a loud hammering noise and a lot of shouting. The boy in the room had handed a snowy owl's cage out to the boys in the car and was attempting to climb out himself when something seemed to be stopping him.

"Get off!" the boy, Harry, Lillian had realized, cried out.

"Petunia!" the man bellowed at the top of his lungs, "HE'S GETTING AWAY!"

Lillian watched as the boys in the car had a tug-of-war with the man over Harry. Finally the boys gave one gigantic tug and the man that had tried pulling poor Harry's leg off, lost his grip and Harry was tugged into the car, safe and sound.

As the car started to speed off, Lillian had a split second to make up her mind. Taking a deep breath, she had her Giant Flower of Doom gobble her up. It magically sprouted from the rear bumper of the car and spit her out.

With a loud thump, she landed right on the roof of the car, just in time to hear Harry call out.

"See you next summer!" he said cheekily to his Uncle, who was staring dumbfounded out the window as Petunia and Dudley stared out at the flying car as well.

"What was that noise?" Ron asked after they all heard the loud thump.

"Did we hit a bird?" Harry asked nervously as he got settled. "And let Hedwig out, she's been stuck in there for ages," he added on.

Ron quickly picked the lock on the cage and soon Hedwig was soaring alongside the car, looking like a ghost in the dark.

Lillian was laying on her back on the car, having had the wind knocked out of her and was extremely grateful that she hadn't been thrown clear over it, as she had no way to land and would most definitely have gone splat.

She turned her head and saw the amber eyes of the owl watching her. Lillian tried to give the owl a reassuring sort of smile, but it came out more as a grimace as she tried to catch her breath.

After a few long moments, she managed to do so and gingerly sat up. She could hear Harry inside the car, explaining something about a house elf (whatever that was) to the other boys inside.

Soon they could be heard speculating as to who the elf had belonged to. Lillian sat quietly and listened in on their conversation as she wondered where they were going. She also wondered how a flying car could exist, but Pitch could have easily explained that to her. Or even Jack. Howgwarts and wizards weren't nearly as hidden as they liked to believe.

The sky was becoming light when the car finally started to descend and Lillian suddenly realized she'd have to move or risk being discovered by Harry. She was pretty sure that the other boys wouldn't see her, but she couldn't be certain. She thought about that, and then shrugged to herself. So what if she was seen?

She was the Spring Spirit, and it didn't really matter if kids could see her, right? It's not like the adults could see her.

She would soon come to realize how very wrong she was.

So she decided to keep her seat as the car touched down and the boys all clambered out, congratulating themselves on getting away with this. One of the twins was telling Harry about their brilliant plan, and Lillian had to stifle a giggle at that.

However, that plan was soon stamped on as Mrs. Weasley emerged from the house and began shouting herself hoarse at the boys. She paused to tell Harry kindly that she didn't blame him when a flash of movement caught her eye.

She hastily drew her wand out of her apron pocket and turned toward the family car, only to stare dumbfounded at a little girl that appeared to be sitting on it.

"Who are you?" she asked the child in amazement.

Lillian, who had been trying very hard not to laugh at the boys' predicament, soon found herself in a predicament of her own. She'd never had an adult that could see her.

"Erm.." Lillian said hesitantly, and then looked at them all a little nervously as all the boys turned to stare at her.

"Hey!" Harry said suddenly. "I've seen you before! You were on Privet Drive last year when I was coming home from Diagon Alley."

Mrs. Weasley eyed the girl suspiciously.

"Were you really?" she asked, as though expecting the girl to jump up and start cursing everyone.

Deciding the cat was out of the bag, Lillian nodded and climbed down from the car.

"I'm Lillian, the Spirit of Spring." she said softly.

Harry looked at Ron, who was exchanging confused looks with Fred and George. The spirit of what?

"Really," Mrs. Weasley said evenly. "Tell me then, how did you come be on top of our car?"

"Uh.." Lillian said hesitantly. "I saw it flying and it went to Harry's house. I decided to tag along and I used my powers to get up onto the roof."

Mrs. Weasley looked around at her children and Harry and gestured to them.

"Go on inside and have some breakfast," she told them.

Lillian looked a little nervous.

"Well.. uh.. I guess I'll just be going then," she said to Mrs. Weasley.

Even if she was very curious about the flying car and how it could possibly be flying, and why a family who lived in a really weird house would own one, she knew it wouldn't be worth it if it would cause a lot of problems.

Besides, she could always pretend to go away and then pop back later to check things out. Maybe she could convince Jack to come along. He might be interested in seeing this family and the flying car too.

Mrs. Weasley continued to eye the girl.

"Are you a muggle?" she asked the girl suddenly.

"Uh.." Lillian said, looking completely lost.

"I thought so," Mrs. Weasley said with a sigh. "Well, you might as well come in for now. I'll have Arthur deal with you, he should be home any moment. Come have some breakfast at any rate."

Lillian didn't think that would be such a great idea, especially when this woman had declared that some guy named Arthur would 'deal' with her. She didn't want to be 'dealt' with, and she was sure that it wouldn't be pleasant.

She wondered what would happen if she disappeared on the spot. She didn't want to freak anyone out, but this lady was kind of scaring her a little.

Upon seeing Lillian's hesitation, Mrs. Weasley gestured at her to get moving.

Wishing she had just left the flying car alone, Lillian reluctantly went inside. As she looked around, her jaw dropped.

She was led into what was the kitchen, but not before glimpsing a bookcase with titles such as "One Minute Feasts - It's Magic!"

She also saw the weirdest clock she had ever seen, that had only one hand and things on it like, "You're late!" or "Time to Feed the Chickens."

She furrowed her brow at it. Was it a joke clock? She had seen one once that had all the numbers at the bottom in a big jumble as if they had fallen. Maybe it was something like that.

She saw the table that everyone was sitting at and took a seat next to Harry. Pretty much everyone at the table kept shooting her curious looks and Lillian found herself placing her hands in her lap and fiddling around with her fingers nervously.

Harry seemed to notice how nervous she was and nudged her a little in a friendly sort of way.

"It's alright," he told her quietly.

Lillian flashed him a somewhat grateful smile as Ron frowned at her.

"Why did you say you were some Spring Spirit? Did you think you were being funny?"

Fred and George glanced at one another. That was their department.

"I am the Spirit of Spring," Lillian mumbled, looking embarrassed. "Only people who believe in me can usually see me though.. I don't know why you all can. And only kids usually believe in such things. I never had an adult see me.. Unless it was on Halloween."

"Halloween?" Harry asked, ever curious.

"It's a time when people believe in all sorts of things," Lillian explained down to her hands, feeling embarrassed to have so many people staring at her. "So mostly everyone can see me."

"If you are a Spring.. whatever," Ron said, narrowing his eyes at her. "Why don't you prove it?"

Lillian looked up at that with a frown at Ron. She didn't really like his tone. He sounded like he didn't believe her, and the way he said it.. It was sort of like a dare. A double dog dare!

And you never started off on a double dog dare. Didn't he know anything?

They were interrupted when Mrs. Weasley started loading up their plates with food. Lillian's stomach interrupted her by rumbling, and she realized that she was starving.

As they all began eating, the backdoor opened and in walked a man who looked pretty tired. He had red hair like all the rest of the family, although he was balding.

"Nine raids," he said wearily as he sat down in his chair at the table. "And Mundungus Fletcher tried to curse me. You wouldn't believe the things our kind have taken to enchanting lately - "

"Like cars, for instance?" Molly interrupted him, her eyes flashing.

"Er.." Arthur said.

"Imagine a man buying a car saying he was interested in how worked, when really he was taking it apart and enchanting it to fly!" Molly shouted.

"I think that you'll find he was well within his rights," Arthur explained, "As long as he wasn't intending to fly - "

"Our sons flew the car you weren't intending to fly to Surrey and back! They brought Harry Potter and a little muggle girl tagged along!"

Lillian suddenly found a very startled look being thrown her way.

"Did they really?" Aurthur asked in an almost eager tone. "How did it go?"

At a sharp look from his wife however, he hastily coughed and tried to sound stern.

"That was very wrong boys, very wrong indeed."

Lillian giggled at this and covered her mouth. It sounded a little like how Pitch used to scold Jack when he wasn't really upset with him, but had to scold him anyway, since Jack wasn't supposed to use his powers in Pitch's lair.

At the sound of Lillian's giggle, Arthur's attention was drawn back to her.

"So.. a muggle?" he asked Molly.

Molly nodded gravely.

"Just think of the Statute of Secrecy!" Molly exclaimed. "What are we going to do, Arthur? She's been missing all night, her parents must be frantic."

Lillian's smile was wiped off her face at the mention of that, and she grew solemn.

"Oh, I don't think anyone's noticed I'm gone yet," she said. She didn't mention anything about a Statute of Secrecy, since she had no idea what it was. "And I can get myself home whenever I want to."

Molly shot Lillian a frustrated look and hissed at Arthur.

"She keeps insisting that she's some Spring Spirit. Obviously it's nonsense. I'm sure it's something she picked up from listening to all the boys talk on the way home."

Arthur shook his head at that and looked at Lillian.

"Where are you from, hm?" he said in what he thought was a cheerful tone of voice, but Lillian could hear the worry in the tone.

"The United States of America," Lillian said as though it were obvious. She didn't have a British accent, after all.

Harry frowned at that.

"You told me you lived a couple blocks away from me," he reminded her.

Lillian shot him a sheepish grin at that.

"Whoops?" she offered.

Harry shook his head at her.

"Near a town called Burgess," she finished telling Arthur. "But like I said, I can get my own way home."

"Of course you can," he said cheerfully to her. "Since you are a Spirit, after all. Is that right?"

"Yeah!" Lillian smiled at him, not noticing that he was discreetly drawing out a stick. "I'm the Spirit of Spring. I'm not supposed to be spreading Spring right now though, so I have to be careful about how I use my powers. I don't want to make Jasper or August mad. It's getting to be Fall soon, and August is pretty territorial about the end of Summer as it is."

Harry and Ron both shared a mystified look, but Arthur nodded along, humoring her.

"What's your name?" he asked her kindly.

"Lillian," Lillian promptly answered.

"What about your last name?" he asked, gently trying to get her to tell him more information.

Lillian frowned a little as she thought, but she came up with a blank. She didn't have a last name. But Pitch was like her dad, sort of.. And his last name was Black. Right?

Was Pitch Black his actual name though? She had never thought to ask. To her, he was just Pitch.

"Um.. I dunno," she said hesitantly after a minute. "I don't really have one."

"Right," Arthur said as he rolled up his sleeve. "Is there anything else you can tell us?"

Ron nudged Harry as he noticed that his Dad had his wand out and looked about ready to be firing a spell. Both he and Harry discreetly moved out of the way, giving Arthur a clear shot.

Harry felt a little bad for the girl, but wondered how she had gotten all the way to England, if she lived in the U.S. Did their family come here on a vacation?

"Not really," Lillian said, then frowned as she noticed what Arthur was holding. "Hey!" she said suddenly. "Why are you holding that stick thi - "

"Obliviate!" Arthur shouted as a beam of light shot from his wand to Lillian.

Her eyes instantly lost their focus and she looked very dazed.

"I'll have to take her to the Ministry," Arthur said with a sigh. "I might as well drive her to the visitor's entrance. I'm not sure how she'd handle apparating or the floo. It would be dangerous to have to place another memory charm on her in such a short period of time, especially with her being so young."

"Will she be alright?" Harry asked him anxiously. He didn't know why, but he felt bad for her. She was just a kid after all. A kid with a big imagination.

"She'll be just fine," Arthur assured him. "She won't remember the car ride or anything about being here."

"What about that Spirit nonsense?" Molly asked. "She seemed convinced she had some sort of power."

"Yes.. well.." Arthur said. "Chances are she got that idea from something the boys might have said. With her memories of the car ride gone, it shouldn't be a problem.. But just in case, I erased her memories of that too."

Lillian shook her head, still looking very dazed. Her eyes were still unfocused and she seemed to be having a very hard time following the conversation.

She was in fact, having a very hard time thinking at all. Her mind seemed to be in a pleasant fog, and she didn't seem eager to come back to reality.

She smiled vaguely at all of them and didn't seem to mind when Arthur rose and took her hand, pulling her up from her seat.

"Come on then," he said to her. "Why don't you and I go for a nice car ride? We'll figure out where your parents are, and get you back to them."

"What if you can't find them?" Harry asked.

Arthur grimaced at that thought, as he wasn't entirely sure what the Ministry would do. They usually didn't have to deal with wayward muggle children.

"We'll worry about that when we get to it," he said to Harry. "But I'm sure we'll find them."

With that he lead the dazed Lillian out of the house, and soon they were on their way to the Ministry.

Back at his lair, Pitch was starting to get a bad feeling. It was the sort of parental feeling he would get when Lillian was up to something, or in trouble.

But he was busy experimenting with some stolen dreamsand, and he didn't have time for such things.

With an impatient sigh, he brushed the feeling away and went back to playing with the dreamsand.

He just knew he could find a way to twist the good dreams to his advantage.

As he played around with the dreamsand more, he soon forgot all about his bad feeling.

Author's Note: So the idea here is that Lillian drops into Harry Potter's world and drags at least Jack Frost into things, and maybe the rest of the Guardians? And a Pitch that's acting strange? (Since this takes place before the Rise of the Guardians chapters and he isn't fixed yet by the Man in the Moon.) And that will change the story around. They will definitely at least need Tooth, since Lillian just had a very large chunk of memories erased.. Silly wizards. They always seem to obliviate first and figure things out second.

I'm also toying around with the idea of Harry's home. I mean.. obviously things are going on if he has bars on his windows, and nobody seems to think this is strange? Fred and George mention that Harry was being starved, but then they never seem to bring it up ever again and Ron and Hermione never question anything about the Dursleys. I'm kinda sorta toying around with Pitch rescuing him eventually, but I'm thinking that might be a bit of a stretch. I'll probably be working on the next chapter of this while I write the next Child of Spring chapter, since even I'm curious about what's going to happen to Lillian at the Ministry.

Anyway, sorry about my long author's notes and I hope you all like this chapter.. I'm sure you weren't expecting me to start off where I did, but I didn't want to just plunk Lillian or Jack or anyone straight into Hogwarts. I also didn't want to start off with Manny asking them to help Harry, since that's been done a bazillion times. I figured having them accidentally stumble into Harry's world would be more interesting.