Synopsis: This is the sequel to my Potter Twins 1: The Key and the Stone. While not required you should read the first story as somethings will make more sense.

This is an A/U story set during Chamber of Secrets.

Not all characters from Buffy will appear in this series, such as Anya - I actually don't like her much. Faith and Wesley were seen briefly in the last story.

Disclaimer: This is the only time I will mention it, as I don't want to have to repeat myself every time I add a chapter. I do not own Buffy the Vampire Slayer or Harry Potter. Buffy is owned by Joss Whedon and Harry Potter is owned by J.K. Rowling.

Chapter 1: Summer

Voldemort walked down the streets of Diagon Alley. No one recognized him of course, no could as he now shared the body with that of a 12 year old girl. He turned down Knockturn Alley and entered Borgin and Burkes. He looked at the proprietor and smiled as the man asked. "Can I help you miss…..?"

Voldemort smiled, "You can address me as the Dark Lord."

The man shook his head, "Excuse me?"

Voldemort grabbed the man's left arm and touched the girl's wand to the man's skin causing the dark mark to appear. The man looked afraid, he knew only the Dark Lord could make the Dark Mark appear. "My Lord, forgive me. I did not recognize you."

"That is fine; I didn't expect you to, since I have to share this body. Anyways I want the book I left with you all those years ago. I have a plan. Also tell me where I can find Lucius Malfoy," Voldemort replied.

A voice came from behind Voldemort, "He is behind you, Miss…." The proprietor held up his arm to show Lucius the dark mark. Lucious Malfoy stared at the dark mark on the proprietor's arm. He knew what it meant for it to appear, that Voldemort wanted something. He also knew that Voldemort was the only one who could make it appear, which meant that the dark lord had to be sharing this girl's body for it to appear. "My Lord, how can I be of assistance?"

Voldemort smiled at Lucius Malfoy and motioned for him to come closer, "With the help of this book I shall be able to return in my own body. I want you to find a way to give the diary to Ginny Weasley. I will send you an owl when the Weasley's intend to buy their school supplies for the coming year. That will be I believe the best time to give it to her."

Lucius nodded as he took the book out of the girl's hands, "Yes, My Lord."

Voldemort turned to leave, "Now I must get back before the girl's parents wonder where she has gotten off to."

Potter's House – End of July

Buffy and Harry sat on the front porch watching as Ron and Willow came up the steps, Not far behind them was Ginny, Fred, George, and Mr. and Mrs. Weasley. Mr. and Mrs. Weasley were carrying several packages and went on into the house as the others sat next to Harry and Buffy on the porch.

Ron was the first to speak up, "So Harry how does it feel to have a real birthday party."

"Well I will tell you after it's over. But I can tell you this having family who wants to celebrate it with you is a wonderful change. It doesn't hurt to have a sister that is turning 12 the same day you are either." Harry replied.

Buffy hopped up as she saw Hermione with her parents, she ran to the girl giving her a hug, "Hello Mr. and Mrs. Granger. My mom is in the kitchen with Mr. and Mrs. Weasley, and Dawn. You can put the presents in the living room."

"Thank you, dear. So you must be Buffy. Hermione has told us a lot about you and Harry. She has told us plenty of times she considers you, Harry, Ron and Willow her best friends." Mr. Granger said just before they went inside, leaving their daughter to be thoroughly embarrassed.

Hermione shook her head, "So I gather your Aunt and Uncle likely aren't coming."

The twins simply nodded. "Of course not," they both said at the same time.

"I wouldn't invite them if they were the last people on the planet. Just go ask, mom, she'll tell you what their like. She met them when we were in Diagon Alley last summer getting our school supplies. They make Malfoy look like a saint." Harry stated.

It was at that time that they were called in for lunch. Joyce had magically altered the dining table so that it could fit all those assembled. The group talked about many things, including returning to Hogwarts in a month. After lunch, the Granger's helped Joyce clean the table while Mr. and Mrs. Weasley brought out the birthday cake and set it on the table. It was larger than anything Harry had seen in his life, larger than any his cousin Dudley had gotten. When the Grangers and Joyce returned to the Dining Room, everyone gathered round and sang 'Happy Birthday' to Harry and Buffy. "Make a wish you two, and blow out the candles." Joyce said.

Harry and Buffy looked at each and smiled as Harry spoke up, "I think Buffy can agree with me that we got our wish, last year. My wish had always been to have friends and a loving family. Something I never got at the Dursley's house. But now I have all that and I couldn't be happier. So I already have my wish."

Buffy nodded in agreement as they blew out the candles.

Later that night after everyone had gone home. Harry, Buffy and Dawn sat in Buffy and Dawn's room talking about the day when they heard a sudden crack and noticed a house elf standing next to them. Dawn was the first one to notice the elf, "Who are you?"

"I am Dobby, Miss Dawn." Dobby replied.

Dawn looked at Harry and Buffy and noticed them frowning, "So what are you doing here, Dobby?"

"I am here to warn you, not to return to Hogwarts."

Buffy stood up at that, "Why should we not go back? We have to go back, school starts in a month."

"No, no, no," squeaked Dobby, shaking his head so hard his ears flapped. "Harry and Isabella Potter and Miss Dawn must stay where they are safe. You are too great, too good, to lose. If Harry and Isabella Potter, and Miss Dawn goes back to Hogwarts, you will be in mortal danger."

"Why?" said Harry in surprise.

"There is a plot, Harry Potter. A plot to make most terrible things happen at Hogwarts School of

Witchcraft and Wizardry this year," whispered Dobby, suddenly trembling all over. "Dobby has known it for months, sir. Harry and Isabella Potter, and Miss Dawn must not put themselves in peril. They are too important, sir!"

"What terrible things?" said Dawn at once. "Who's plotting them?"

Dobby made a funny choking noise and then banged his head frantically against the wall.

"All right!" cried Harry, grabbing the elf's arm to stop him. "You can't tell us. We understand. But why are you warning us?" A sudden, unpleasant thought struck him. "Hang on — this hasn't got anything to do with Voldemort do it?"

Dobby flinches at the use of Voldemort's name but didn't answer the question, "You cannot go back. Please take my warning and don't go back." With a crack Dobby vanishes.

Harry looked at his sisters and shook his head. He bid goodnight to Buffy and Dawn and went on to bed.

The day after the party a knock came at the door, Buffy went to answer it. She saw it was a tall man wearing glasses and a muggle suit. "Yes can I help you?" Buffy asked.

The man smiled, "Are you by chance Isabella Potter?"

Buffy gulped calling for Joyce before nodding. "Yes."

Joyce stepped up behind her and looked at the man, "Good day sir, can I ask what you want with my daughter?"

The man smiled, "It would be best if we talked about this inside."

Joyce hand slipped to her wand as she nodded. The motion of her hand did not go unnoticed by the man. "You won't need your wand, Mrs. Summers," the man said.

Joyce looked at Buffy for a moment and then they showed the man into the living room, "Sorry about the mess. Buffy and Harry had their birthday party yesterday and we haven't cleaned up yet."

The man nodded, "That's quite alright. Now let me introduce myself. I am Rupert Giles."

Joyce blinked, "Rupert Giles, I've heard of you. You were I think a year ahead of my brother at Hogwarts."

Giles nods, "James Potter, yes I remember him, my condolences by the way. I was sad to hear when he and his wife passed away. Anyways the reason I am calling today is because Isabella here has been called."

Buffy blinked and frowned, "You mean I'm a Slayer?"

Joyce looked at her daughter and tried to remember the origin of the word. Then it clicked, the young woman who protected Dawn last year had been a Slayer. "I thought there could only be one Slayer at a time. Isn't that what you told me, Buffy?"

Buffy nods and looks to Joyce, "It's true." She turns and looks at Giles, "So does that mean Faith is dead?"

Giles laughs and shakes his head, "That is a long story. A few years ago Faith drowned and was resuscitated by a friend of hers, Xander Harris. Technically she was dead for less than a minute. But it was long enough for a new slayer to be called. Kendra was that new slayer; she died recently at the time you were called. It took us some time to locate you. This house is shielded isn't?"

Joyce nods, "Yes it is, it's so that Buffy and Harry can be protected from He-Who-Must-Not-be-Named. So you were saying Buffy is a Slayer now?"

"Yes, the Watcher's Council sent me to train Isabella. By the way why do you call her Buffy?" Giles said.

Buffy laughed, "Because that's my name. Haven't gone by Isabella since I was about a year old. Mom changed my name when she adopted me after my birth parents died."

Giles nods, "Ah! Then I will endeavor to call you Buffy. Anyways I was sent to train you. Seeing how your only 12 years old, the Council decided you should get training before your put out in the field. Normally that would mean taking you out of your home to a Council facility. But I am going to go against Council policy, since you are also a witch. I feel being trained as both will increase your potential as a Slayer."

Joyce obviously didn't like it one bit. She had heard about the Slayer from Buffy and knew that they were destined to die young and fight demons and vampires, and the like. But she knew that her daughter would want the training anyways, and would want to do what was right. "Very well, I have my objections of course - what parent wouldn't. But I know Buffy she will want to do this if it meant protecting the people she loves. I would suggest you contact Dumbledore though."

Giles laughs and nods, "One step ahead of you. I already sorted all this out with him."

As the days went by Giles trained Buffy. Harry and Dawn had joined in on the training sessions, they had been adamant about training and nothing Joyce or Giles said could change their minds. And so Giles set up a training regimen for all 3 children.

It was while one such training session that an owl flew in dropping 3 envelopes. The each grabbed the envelopes and opened them. Dawn blinked as she read hers and showed it to Buffy and Harry.

Miss Dawn Summers,

It is our privilege let you know due to your outstanding scores from the previous year that you will be allowed in second year classes this coming term, instead of first year classes with others your age.

Enclosed is a list of what you will need for your second year.

I would personally like to say congratulations as your now officially the youngest student to come to Hogwarts.

Minerva McGonagall

Deputy Headmistress

Hogwarts School of Witchcraft and Wizadry

Harry and Buffy hugged Dawn and smiled at the girl. "Good going, Dawnie. I knew you could do it." Buffy said.

Joyce walked in from the kitchen and looked at the three children before Dawn handed her the letter. "Dawn that's wonderful. I will have to get you something special from Diagon Alley when we go to pick up your supplies. Which will be tomorrow, I just talked to Molly through the fireplace. She said they got their letters also and would be going to Diagon Alley tomorrow to pick up supplies."

Buffy and Harry looked at each other and smiled, "Mom we would like to do something for Dawn too."

Buffy and Harry pulled Joyce aside so that Dawn couldn't hear. "We want to open up an account for Dawn. Between the two of us we have more money at Gringotts than we really could need, and would like to give her some." Buffy whispered.

Joyce looked at the twins, "Are you sure this is something you want to do?" The twins nodded. "Very well," Joyce said.

The next day when they, along with the Weasleys and the Grangers, arrived in Diagon Alley. Buffy and Harry made an excuse of having to use the bathroom. They made their way to Gringotts. They stepped up to a counter, "We would like to open an account for our cousin, taking some of the money out of our accounts and putting it into hers." Buffy said.

The goblin at the counter nodded, "You have your keys?" They nodded holding them up as the Goblin continued, "Very well. Who are you opening an account for?"

Buffy looked at Harry and smiled, "Dawn Marie Summers."

The goblin nodded and pulled out some paperwork which he filled in, "If you will sign here as the owners of the vaults your tranfering money out of. We can get it setup now."

They signed the paperwork and were handed a key and left.

Stopped in front of Flourish and Blotts and noticed a sign mentioning Gilderoy Lockhart was signing copies of his autobiography that day. They stepped into Flourish and Blotts to find a long line, "Oh you got to be kidding me, all this to see some idiot." Buffy said.

The twins were motioned to where Molly Weasley stood with her children, Hermione and Dawn. Buffy could see that they looked to infatuated with Lockhart.

A man holding a camera pushed past Buffy and Harry as they frowned. "How rude can someone be?" Harry asked.

The photographer paid them no mind, "Make way there. Please! Let me by, madam. Thank you. Excuse me, little girl. This is for the Daily Prophet."

Buffy and Harry suddenly felt as if someone were watching them. They looked around and then noticed Lockhart was staring at them, "It can't be – Harry and Isabella Potter? "

The photographer grasped ahold of Harry and Buffy and moved them around the table to stand next to Lockhart. "Nice big smile, Harry, Isabella. Together the both of you and I rate the front page! Ladies and gentlemen, what an extraordinary moment this is. When young Harry and Isabella stepped into Flourish and Blotts this morning to purchase my autobiography, Magical Me,... which, incidentally is currently celebrating its 27th week atop the Daily Prophet bestseller list, he had no idea that he would, in fact, be leaving... with my entire collected works, free of charge."

The twins stood there for a moment as books were stuffed into their waiting arms. They walked over to Molly who took the books from the twins. "Harry, Isabella, now you give me those, and I'll get them signed. All of you wait outside."

The group made their way towards the door as Buffy frowned, "Of all the idiots in the world. That guy just ticks me off."

They spotted Draco standing next to his father. "I'll bet you loved that, didn't you, Potter? Famous Harry and Isabella Potter! Can't even go into a bookshop without making the front page.

Buffy balled up her fists and hit Draco in the stomach. "You're an arrogant git."

Draco simply growled at Buffy as his father pushed him aside. "Now, now Draco, play nicely. Mr. Potter, Ms. Potter... Lucius Malfoy. We meet at last. Forgive me, your scars are legend, as, of course, is the wizard who gave it to you."

Harry shook with rage, "Voldemort killed our parents. He was nothing more than a murderer."

Lucius dismissed it and while they had their attention on his face they didn't notice when he slipped a black book into the cauldron Ginny was holding. "Hmm. You must be very brave, to mention his name...or very foolish. Regardless, Draco we must be off."

Harry felt a hand on his shoulder and saw Joyce and smiled as they made their way out of the store. Joyce handed Dawn a carrier, "I know you didn't get a pet last year. And since Harry and Buffy both have owls. I thought you would like a cat instead."

Dawn looked in the carrier and smiled, "I think I will call her Joy. Thanks, mom."

Joyce smiled and nodded, "I think Buffy and Harry have something for you also."

Dawn turned to face Buffy and Harry as they handed her an envelope. She opened it to find a single solitary key. She looked at them, "What's this for?"

Buffy smiled, "Well you have your own account now at Gringotts. Me and Harry gave you a share of what's in our vaults."

Dawn looked at the key for a moment, "You didn't have to."

"I know we didn't but we wanted to." Harry said.

Dawn blushed as she hugged the twins.

Author Notes: Buffy was actually called at the end of the last story. I had planned on revealing it in that story and didn't get a chance. Which btw the way she was called was not how I was originally planning it. I wanted her called as part of the deal with the First, much like you see in the BTVS series finale. As I wrote the ending I changed my mind at the last minute, part of my reasoning for changing it is because I'm thinking of using the First in some part in year 5 or 6.