Ok I know things might not quite fit but I haven't got far enough to work out how to make them fit.Just a warning for the future..BTW that means pls keep reading to find out.

"I was in the process of writing a second letter, this one to Dawn when I decided to come here instead."  Dumbledore handed a letter to Dawn which she opened quickly.

HOGWARTS SCHOOL OF WITCHCRAFT AND WIZADRY
Headmaster:Albus Dumbledore
(Order of Merlin, First Class, Grand Sorc., Chf. Warlock, Supreme Mugwump, International Confed. of Wizards)

Dear Miss Summers,

We are pleased to inform you that you have a place at Hogwarts School of Witchcraft and Wizadry.  Please find enclosed a list of all necessary books and equipment.

            Term begins on 1 September but  we recognise that you are starting your wizarding education later than is usual and so would like you to attend some extra classes before term begins. We await your owl by no later than 31 June.

Yours sincerely

Albus Dumbledore

Headmaster

"I'm a witch?  No way.  How did that happen?"

"Well magic can suddenly appear in families but we believe that you have half magic blood."

"Wouldn't that mean Buffy's a witch too?"

"Technically yes, really the magic has had to come to you through Buffy because she is your source.  We believe it originally comes from your father's family."

Dawn was a little shaken when she realised that Dumbledore knew so much about her unusual origins and looked at Giles with raised eyebrows.

"Dawn Professor Dumbledore knows about a lot more than you'd imagine, you being the key is a fairly insignificant piece of information.  He knows all about what happens here and about the Hellmouth Buffy. I've been in touch with him since I became your watcher."

"So is that how you knew about Willow?"

"Yes and I also had quite an interesting chat with Miss Rosenberg not so long ago."

"Seriously you saw Willow, is she Ok, she's not evil anymoreright?"  Buffy's voice showed how much she missed her friend and how worried she was for her.

"Miss Rosenberg has made dramatic progress, the coven give me very good reports and…"

"So she's nearly better?"  Buffy wanted to be told plain and simply that Willow was fine that she was the girl Buffy had grown to love almost as a sister but was sure that she didn't want to be anywhere near her until she definitely was better.

Giles glanced at Dumbledore before saying "Well actually we asked Willow to come to Hogwarts as well." Giles winced as he anticipated an explosion from Buffy but it came from Dawn.

"What! She's not finished that thing, she could kill us.  I'm not going anywhere she is.  How do you know she's not still evil inside?"

"Miss Summers I understand your concerns but please give me a moment o explain recent events.  You see Miss Rosenberg used her magic, controlled magic, to save one of my students from a creature I've never seen before."

"What did…."

"Giles research later explanations now."  Buffy could see Giles going into research mode from a mile off.

"Yes yes of course. Sorry, carry on Albus."

"Well really this is my other reason for coming here and research could be very useful very soon.  You see I believe this creature belongs to what I would consider to be your area of expertise, possibly some form of demon, and I believe that such creatures may endanger my students.  I can't afford for that to happen so I am asking you to come to Hogwarts and work as a team to aid its security and for Dawn to come as a student."

"Okay why should we do that?  Incase you hadn't noticed the Hellmouth is pretty much the best location for a slayer, there's quite a few evil things to deal with here, not to mention people to save and well pretty much our lives.  Dawn's got school I've got friends etc so unless you've got a really big pile of cookies or something at that school I can't really see us leaving Sunydale."  Buffy looked at Giles for confirmation but was surprised to see him shaking his head.

"Buffy I really don't think we have much choice."

Buffy's mouth fell open and she struggled to find words, instead only indistinct noises came out as she tried to contemplate moving to a world she didn't even know if she believed in.