Title: A Sparkle on the Hellmouth

Author: Brightstar Kenobi

Disclaimer: I own nothing to do with either BtVS or Twilight, and will make no money off of this work. This has been reedited thanks to my wonderful Beta.

Author Notes 1: I am a first time writer, although I have been reading fanfiction for years on this site. I'd like to say thank you to my new beta reader, Starway Man, for editing this story.

Author Notes 2: I have adjusted the timeline to allow for the Twilight saga novels to be known to the Scooby Gang, so it is 2012 not 1997. Hope this is OK and not too far out of canon for you, dear readers.

Summary: The Scooby's find themselves on the Hellmouth during Halloween. Life will never be the same again for Xander Harris. Dawn will in this story as a member born into the Summers family. How will the Scooby's cope with the consequences of Halloween? This will also be AU Post Breaking Dawn Twilight Book not Movie.

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Chapter 1 - A Costume Choice

Xander, more formally known as Alexander Lavelle Harris, entered the newly opened costume store known as Ethan's with a sigh. His day had not gone well; actually, it had been more like disastrously disastrous.

First off, there was that humiliating experience with the jock known as Larry, which was only compounded by having to be defended by a girl. This girl was not just a girl, but also THE Buffy Summers. Hottie, unrequited crush and even the Vampire Slayer.

The next disaster was being cornered by Principal Snyder, otherwise known as the Troll, for Halloween escort duty. He couldn't escape his fate, any more than Buffy and his co-best friend Willow Rosenberg could.

Oddly, his girls had forced him to read a novel saga over the past fortnight. This saga was the cause of him being at the costume shop, not for a toy gun as he had originally planned – his military fatigues had been destroyed in a fit of rage by his drunken father – but for a complete costume. A costume for – agggh! – something he couldn't even vocalize in his own thoughts, despite his promise to Willow that he would wear such a thing for the festivities tomorrow night.

"Freaking troll, the two dollar costume dealie will not work for this one," Xander muttered, looking around the store - all hope fading of not having to dip into his savings to get what he wanted.

Xander moved around the store, eventually finding the parts needed for his costume from the bargain bin. Suddenly, without warning or any sound, the store owner appeared behind him.

"Garrghhh, don't do that!" Harris gasped, turning to face the costume shop owner.

The store owner replied, "Sorry lad didn't mean to scare you. I'm Ethan Rayne."

"Yeah. Okay. Well, I need to get something to complete my costume, apart from all this stuff – so, do you have any wristbands?" asked Xander.

"Yes I do, but the only ones in stock right now are from a set of books," said Ethan.

"Twilight?" asked Xander hopefully.

"Why, yes," Ethan smirked.

"Good, I'll take one. Hey, what's the funny?" Xander replied, after seeing the smirk on the store owner's face.

"Oh, nothing, just wondering who the girl is you are trying to impress?" Ethan asked.

"No one, this is just a favour for one of my friends," Xander replied – noting how this guy was British, and wondering if Giles had been the same when he was younger. Still, he was beginning to get annoyed and just wanted to get out of this store after making his purchases. "So, can I see 'em?"

Ethan showed Xander the wristbands, stating, "These were created for the movies that the books have been made into, my boy. Damn shame how this town's theatre, that Sun Cinema place, won't show those movies, what? Anyway, that will be $23.47 in total."

Handing over the money, Xander exited the store and quickly started off home. He had a costume to get ready. He would not be alone tomorrow night in his escort duties, as his girls would be escorts too.

It would be a night that would never be forgotten by any of them, either.

A/N: Please review and tell me how I am doing.