While I'm not so patiently waiting for the new book to come out I think I've got HP on the brain because this idea sort of popped into my head and wont leave me alone. I've read a lot of stories where Buffy falls into a portal and winds up in Hogwarts and ones where she was someone's relative and taken away to become the slayer. So I decided to combine the two ideas with a few twists along the way. Let me know what you think.

"How could you." Sirius glared as they stood wands pointed at each other.

"Did you really think you'd get away with it?" James demanded furiously.

"We haven't the faintest idea what your speaking of." Bellatrix laughed.

"She's your cousin for gods sake you bitch." Sirius spat.

"She was asking for it." Lucius smirked. "Little brat shouldn't be sticking her nose where it doesn't belong, neither should you."

"You think were afraid of you?" James demanded.

"Stop Sirius Please there not worth it." A small blonde shouted running over to them on the quidditch pitch with Lilly at her heals.

"Evans get her out of here." James ordered.

"No, you need to stop." The blonde insisted.

"They need to pay." Sirius said darkly.

"Remus please, you're the sensible one, tell them this isn't a good idea." She begged.

"I'm sorry, but James is right." Remus replied.

"Listen to her, walk away while you still can." Snape glared.

"To think of all the times I defended you, and it turns out you're a monster, just like them." Lilly said sadly.

"Shut up Mudblood." Snape growled.

"Oh that's it you bloody prat." James swore as the darkened pitch erupted in shouts and streams of light.

Everyone froze as they seemed to gather in the middle of the dueling groups instead of hitting there targets bouncing off each other as they swirled forming wall of colored lights that bounced dangerously.

"Lilly watch out!" The blonde cried pushing her aside as it came straight at them hitting her with an explosion of light.

They all looked away blinded by the brightness, when they turned back, she was gone.

"Buffy!" Sirius called desperately. "BUFFY!!"

"Get out!" Snape Growled dangerously glaring at Harry after he threw him out of his mind.

"Who was she?" Harry demanded.

"None of your Business." Snape barked. "Get out, the lesson's are over."

"You killed her, I saw it." Harry insisted.

"You have no idea what you saw. GET OUT!" He ordered.

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"Lemon drops...lollipops...oh just bloody well open." He ordered the unmoving statue.

"Potter what are you doing out of bed!" Professor McGonagall demanded.

"I need to see Professor Dumbledore." Harry insisted.

"It'll have to wait till morning, he's not in." She replied. "Now off to bed before you get detention."

"Yes Professor." Harry sighed.

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"I've never heard of anything like it." Hermione said stunned after Harry filled them in.

"Who was the girl?" Ron asked.

"I don't know." Harry sighed. "She saved my Mum though."

"You should just ask Sirius." Hermione replied. "He'll be here to check up on your lessons anyways."

"I don't know." Harry replied unsurely as if on cue the fire sparked glowing green as Sirius's head appeared in it.

"All clear?" He asked glancing around.

"Yeah were safe." Harry nodded.

"How was your lesson?" He asked. "Snape isn't being a prat is he?"

"He ended them." Harry replied.

"He what!?" Sirius demanded.

"I think I saw something he didn't want me to see." Harry replied unsurely.

"Look Harry I know you've seen your father and I do some things that seem sort of mean, but you have to understand, we were just kids and..."

"It's not that." Harry cut him off. "I saw...Who's Buffy?"

"B..Buffy." Sirius gasped.

"Someone's coming." Hermione warned.

"I'll be in touch." Sirius replied shaken as he disappeared from the flames.

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"Where do you suppose Dumbledore is?" Ron asked as they sat outside.

"I don't know, but We probably shouldn't make to much of his not being here with Umbridge around." Hermione pointed out.

"I just hope he gets back or I get another chance to talk with Sirius." Harry sighed.

"He seemed really shocked when you asked about her, didn't he?" Ron asked. "Who do you think she was?"

"I don't know, but you should have seen how angry they all were." Harry replied. "I've never seen them look like that, not even when they confronted Peter."

"I tried looking her up in the library, but there's no mention of a student named Buffy anywhere." Hermione replied.

"Maybe she wasn't a student." Ron shrugged.

"She was here, in uniform." Harry replied. "She must have been."

"Harry." A voice greeted.

"Hello Hagrid." Harry smiled.

"You lot need to come with me." He said glancing around quickly as he led them into his hut.

"Professor Lupin, what are you doing here?" Hermione asked seeing him waiting inside.

"I spoke with Sirius this morning, we need to have a talk." He replied. "He told me you saw something last night. Something about a girl named Buffy."

"I saw her die, in Professor Snape's mind." Harry admitted noting Remus flinch at his statement.

"Who was she?" Hermione asked curiously. "Was she a student, because there's no record of her, I checked."

"She was, and there is, you just were looking for the wrong girl." Remus sighed. "Buffy, She...well Buffy was a nickname, her real name was Bellona Black, she was Sirius's sister."

"The other burn spot." Hermione declared. "On the family tree." She explained at Ron and Harry's confused looks. "Remeber when he pointed out his spot where his Mum blasted him off? Well there was another person next to him taken off as well."

"She was right around your age when it happened. Such a sweet girl, always stopping by to see me like you lot." Hagrid said tearfully pouring them cups of tea.

"Thank you Hagrid." Remus smiled sadly accepting a cup.

"I don't understand how they got away with it, they killed her!" Harry insisted.

"We were just as much to blame as they were." Remus began painfully. "Nothing was ever the same after that night. It was a dark time, Voldemort had begun recruiting students, noone knew who they could trust. Buffy had overheard something she shouldn't have. She went to Dumbledore with it and they found out. We should have listened to her. She was right you know. Things had changed, we were foolish to put ourselves in that position it's a miracle one or all of us weren't killed."

"It was just the three of them against you." Harry replied confused.

"Yes, but they were working for Voldemort, this wasn't a silly school yard duel. We weren't yet prepared to do the things that they were." He sighed. "We were just so angry."

"What did they do to her?" Hermione asked hesitantly.

"That's not something you need to know." Remus said darkly. "Dumbledore doesn't agree with Sirius and I on this, but Harry we believe Snape had his reasons for showing you that memory."

"No, he was furious I did." Harry insisted.

"Whatever the case may be, We are all in agreement that you need to leave it alone, forget what you saw. No good can come of it." Remus sighed.

"Why would Professor Snape want Harry to see that?" Hermione asked curiously.

"Because." Remus sighed. "Because, she didn't die. Not for sure. What happened that night, when those spells collided, it may have sent her somewhere. We'd have done anything to get her back, spent years trying. Shortly after we graduated, and joined the Order, Bellatrix contacted Sirius. She told him Voldemort knew how to get her back. That if Sirius helped him destroy the Order, he would tell him. That's why... "

"Why you believed Sirius betrayed my parents." Harry realized.

"If he had, that would have been the only reason." Remus nodded. "Like I said we would have done anything to get her back."

"But he didn't, he didn't betray them." Harry replied.

"No, he didn't." Remus smiled sadly. "They tried to use her to sway Sirius to their side and failed, now we fear they use her to do the same to you. You need to continue your lessons, Dumbledore will speak with Professor Snape. Wether or not the answer to bring her back lies in Voldemort mind, Harry you can't allow that to temp you."

"She saved my Mum." Harry replied quietly.

"It's been almost twenty years, she's gone." Remus replied firmly. "Getting yourself killed wont ease Sirius's pain or our guilt."