Author's Note: Okay, I feel bad, because I know I said this story wasn't really a priority at the time but it's gotten so many wonderful reviews that I'm going to post this new chapter. And I'm still taking suggestions for pairings because I don't have any planned right now.

Disclaimer: I do not own the rights to BtVS or HP.

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James woke early with a grin on his face. It was time for the first Quidditch practice of the year and he was determined to take the cup for Gryffindor. After pulling on his uniform he walked over to Sirius' sleeping form and nudged him.

"Bugger off, mate," Sirius growled before rolling over and pulling the blankets above his head.

"C'mon Padfoot. We have practice. Get up." Sirius continued to ignore him and soon he was snoring loudly. Finally, James gave up and he withdrew his wand from its holster. "Aguamenti!"

The cold stream of water had Sirius bolting upright in his bed, sputtering and glaring angrily at his best friend. "Would it have killed you to use warm water," he muttered before using another spell to dry himself off.

Sirius continued to grumble good naturedly as they made their way to the Quidditch pitch. James continued to talk non-stop about their training schedule, and strategy and beating Slytherin, but Sirius had tuned him out a long time ago.

It wasn't that Sirius didn't care, but to him Quidditch wasn't so much about the rules and constant practicing, but it was the freedom that made Sirius continue to play. Winning didn't hurt too much either.

When James stopped at the edge of pitch he turned and faced the team, preparing to launch into another speech of some kind. Sirius just rolled his eyes and prepared to mount his broom.

He'd just swung one leg over the broom when something caught his eyes. Out in the centre of the field was something that seemed to shine like spun gold. Curious he dismounted his broom and walked out onto the field.

As he got closer he realized it was a girl, with shining blond hair that cascaded over her face like a veil. He felt a tug at his heart as he remembered the conversation from the night before. Every time he saw someone with blond hair he thought of her. Sirius knew James had an even harder time.

Drawing his wand Sirius approached the girl. She didn't stir and appeared to be unconscious. He frowned when he noticed the paleness of her skin. He realized with a frown that she most likely had been outside the whole night in the storm.

"Hello?" he called softly. "Are you awake?" Behind him he heard the soft footfalls of his teammates. It seemed they'd noticed the girl as well.

"Who is she?" someone asked quietly.

"Shh," Sirius cautioned. "We don't want to spook her."

James stepped forward as Sirius knelt next to the girl. Her cream coloured sweater was still damp from the rain and clung to her body. She appeared to be their age, maybe a little younger. As gently as possibly Sirius rolled her onto her back and her hair fell from her face.

"Elizabeth," James whispered.

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"It can't be her James. She's gone," Remus said sadly. He tried as best he could to comfort his friend.

"You didn't see her Remus. She looks just like her; in every possible way. I know it shouldn't be possible but part of me just knows it's her."

"What did Dumbledore and Madam Pomfrey say?" Peter asked. The marauders sat outside the medical wing waiting for word on the mysterious girl.

"Nothing. They just took her from Sirius and rushed off." He turned to look through the doorway. "Hopefully they'll know something soon."

As if on cue an earsplitting scream filled the hall and the four boys moved to cover their ears. There were sounds of struggling within the room.

"Restrain her!" they heard Madam Pomfrey shriek.

Ignoring the orders to stay in the corridor, the boys rushed into the room to see the blond girl pressing the Headmaster against the wall. He still appeared calm but they could feel the power radiating from her.

"I-I d-don't think that's Elizabeth," Peter stuttered.

The girl turned to glare at the boys and it was hard to deny, the girl did resemble an older version of the Elizabeth they'd once known.

"Where is Dawn," she hissed. Her eyes flashed with anger as she released her grip on the headmaster, allowing him to talk.

"I can assure you, Miss, there is no one by that name at my school," Dumbledore said calmly. "Please calm down."

"Calm down?" she growled. "My baby sister could be dead, I have no idea where I am, and I'm staring at some Gandalf wannabe. Would you be calm?"

"Well she certainly talks like Elizabeth," Sirius and Remus chuckled.

The girl continued to glare at Remus and Sirius before her gaze fell on James, whose eyes had been locked on the tiny blond since the first moment they'd walked through the doors.

A brief flash of recognition clouded her eyes before she dropped to her knees crying. Between sobs she choked out James' name.

He was instantly at her side wrapping his arms around her tightly. He rocked her until she began quiet. The rest of their audience remained quiet.

"How on earth did you manage to calm her Mr. Potter?" Madam Pomfrey inquired in disbelief. "Even with potions we could barely keep her restrained."

James merely ignored the medi-witch and continued to whisper quietly to her. "Everything's fine Elizabeth," he soothed. "I'm right here."

"It's Buffy," she mumbled quietly against his chest. "Elizabeth died a long time ago."

"Okay, Buffy," he said slowly, trying the name out for the first time.

"Missed you James," she admitted quietly.

"Missed you too sis," he responded. "I'm not going to let you go this time."

Buffy just nodded numbly. Madam Pomfrey gasped and turned to face Dumbledore. "Is it possible? Is she Elizabeth Potter? But she disappeared years ago. They said she was dead."

Dumbledore smiled with a twinkle in his eyes. "It would appear so. The Powers that Be have given her back to us."

Buffy's head shot up at the mention of the PTB and she growled. She pulled away from James and rose in one fluid motion to her feet before he could pull her back. "Whistler!" she screamed. "Get down here! I know you can hear me."

James and Sirius moved to try and restrain her but she pushed past them and continued to scream for Whistler.

"Alright, Slayer. Keep it down, I'm not deaf." Whistler's voice filled the room. The marauders turned to stare at the new arrival.

"Why am I not dead?" Buffy demanded.

"Buffy," James cautioned. He didn't like the idea of his long lost sister being dead. He'd lost her so long ago and he only now had her back. Losing her again would tear him apart.

Buffy pushed him away. "Stay back James. This doesn't involve you." She turned back to Whistler. "I jumped. I sacrificed myself to save the world, to save Dawn. Why am I not dead?"

"The PTB thought you deserved the life they took from you. They needed a Champion and you were it, Slayer. They thought since you died young they'd let you live the life you would have if they hadn't taken you."

"So they decided to ruin both lives? I was happy, Whistler. It was over. I was finally able to rest and then I wake up here again. They're at war! Did the PTB think I'd be able to sit by and watch that?"

"I'm just the messenger. The big moments are gonna come; you can't help that. It's what you do afterwards that counts. That's when you find out who you are."

"Don't you go all cryptic on me. I know who I am," Buffy said grimly. "And right now, I don't like it." She started to cry again. "They left me with my strength. They never meant to give me this life back. They sent me to war. I'm still their damn puppet."

James and Sirius finally got close enough to Buffy and pulled her away from the stranger. "I think you should go," Sirius warned him.

Whistler turned to Buffy. "They haven't abandoned you Slayer. You're not alone now. This is for the best." He turned on his heel and disappeared from the room.

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"Does anyone want to tell me who that was?" Sirius finally asked.

"The man who seems fond of turning my world upside down," Buffy replied before sinking to the ground. "I don't think they're ever going to let me go."

James just silently held his baby sister while she tried to collect herself. As her voice steadied she turned to Remus. "It's a full moon tonight. Where do they restrain you?" she inquired.

Remus tried to mumble out a response, but was astonished that she knew his secret. Elizabeth Potter had disappeared long before James, Sirius and Peter had figured out his unfortunate 'illness'.

"Mr Lupin is kept in the Shrieking Shack during the full moon," Dumbledore supplied.

"No chains?" she asked.

"Isn't that a little kinky Elizabeth?" Sirius joked with a wolfish grin.

Buffy glared at the Gryffindor. "It's Buffy. I haven't gone by Elizabeth in many years."

"What kind of a name is Buffy?" he snorted.

"Really, Sirius?"

Remus just chuckled. "That is definitely Eliz- Buffy."

James turned solemnly to his sister. "Where were you all these years? We thought you were dead. Our parents, everyone, mourned you."

Buffy sighed. "Is there anyone else who needs to hear this? I don't want to repeat it. It's long and it's painful."

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Buffy took a breath and looked to the people surrounding her. A number of Hogwarts staff who had known Elizabeth Potter had come as well as James and his friends. Buffy sighed as she began her tale.

"When I disappeared I wasn't taken by Death Eaters or by Lord Voldemort but by The Powers that Be. They were searching for someone to be the champion of another world. A world, that like this one, has magical creatures and dark forces that are constantly struggling against the light. This world was so similar to this one," Buffy sniffled.

"In this world there is a warrior known as the Slayer," Buffy continued. "It's her job to fight against the vampires and forces of darkness. She has preternatural strength, improved mental abilities and can master the use of any weapon within moments of having it in her hands. When one Slayer dies another is called. The problem was the Master was rising and the PTB knew this. They needed a Slayer strong enough to overcome him. They couldn't find a girl within their world. So they took one from ours.

"They stole me away during the night and erased my memories as best they could. They altered the memories of a childless couple and made me their daughter. I didn't remember this life." She looked at her brother. "I didn't remember you James. I never even realized what I was missing."

"If you didn't remember how did you recognize James?" Remus asked her.

"When I was sixteen, there was a prophecy that basically said that I would face the Master and I would die. I tried to quit, I wasn't ready to die, but in the end I went to face him. And I was killed." Buffy quickly silenced them before they could jump in with questions. "My friend Xander and my boyfriend Angel followed me. Xander performed CPR and I was brought back. But I was dead long enough for a new Slayer to be called. And the whole dying thing seemed to bring my memories back. Suddenly I remembered a family and brother who loved me.

"I became so closed off from my mom and friends. I out-bitched Cordelia," she recalled with a faint smile. "I never told anyone, not my mom, my watcher, my friends or my sister slayer. To skip over the boring details, basically I went through some hard times."

The room was stunned into silence. No one was quite sure what to say.

Buffy just frowned and continued. "Things got better when these monks gave me a sister. They wanted me to protect this key from this hell god. She called herself Glory. The only way they could think to do this was by making the key into my sister. That way they knew I would protect Dawn with my life. In the end that's what it came down to. Glory opened the portal and the only way to close it was with Summers blood. I wasn't willing to let Dawn jump. So I did. I died again. Only this time I was hoping it would be permanent."

"My dear, that is quite the extraordinary tale," Dumbledore exclaimed. "And the Powers that Be returned you here upon your death?"

Buffy nodded. "Unfortunately." She looked to James who looked stricken. "It's not that I'm unhappy to finally be back with my family," she said hurriedly. "But I was ready to rest. I just wanted to rest."

James smiled and hugged his sister again. He knew that things would be hard for Buffy as she adjusted to life back at Hogwarts but he was going to help her.

"I think it would be best if everyone turned in for the evening," Dumbledore informed them. "Miss Potter, we will talk tomorrow about your schedule. That is, if you want to rejoin your brother at Hogwarts. Until then you can sleep in the Gryffindor dormitories."

"I think I'd like that," she said softly.

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And to those who read The Dark Lord's Daughter, I will have a new chapter out soon :D Please review.