THE TITLE : Skeleton Key

THE RATING : Teen +

THE GENRE : All / Romance

THE TYPE : Crossover

CROSSOVER : The Mortal Instruments / Buffy the Vampire Slayer

KEY PAIRINGS : Jace / OC

SUMMARY : Jace and the team are on the hunt looking for some vampires that have broken the accords - while on the hunt they meat someone unexpected .

DISCLAIMER : I do not own canon content of anything from The Mortal Instruments or Buffy the Vampire slayer - I merely own the plot for this story and any original content within it.

AUTHORS NOTES : I just want to let everyone know I have only read City of Bones and just started on City of Ashes, this idea came to me while reading and watching Buffy the vampire slayer, I apologize in advance for any errors i make with anything involving The Mortal Instruments series. But this is my own story/idea so things won't be a 100 % canon - but fanfiction is meant to be not canon. So my story is taking place Post - City of Bones. Also most of you may also know that City Of Bones will be turned into a film you may agree or not agree on their casting but personally I am 50/50 with their choices in casting so I will leave canon characters up to your imaginations - as for my story, and my lead original character Aderes will be portrayed by: "Taylor Momsen." - If you don't know her you can google her or search her in whatever way you search.

II .) CHINESE BURN

The Shadows hunters didn't know what to think about the girl in the alley who had turned three vampires into dusts and then booked it from the alley and was gone as if she had never existed. They sat at the institute trying to figure it out, but none of them could come to a conclusion. They had come up with some of the most ridiculous of things such as a vampire with a grudge on her own kind, or some form of demon, but nothing they named sticked.

"So she wasn't one of you then?"

Simon asked and Alec shook his head along with the other three, who followed suit in the head shaking before he spoke,

"No she couldn't have been she didn't have the marks, besides no other shadow hunters were suppose to be coming this way- Its just us."

He explained, Shadow hunter had been ruled out quickly before Simon had even brought it up. She had no marks, she wasn't giving off anything to say she was anything out of the ordinary, to say she was a downworlder - she looked like a mundane, but none of them had ever seen a mundane move so fast or kill vampires with such ease... they doubted that she was just a mundane as she had appeared to be but they had no evidence or anything saying she was something out of the ordinary. They had turned the alley upside down and found nothing except alley garbage and signs of the struggle and a bit of blood here and there which did them no good.

"Well maybe we should go back. Maybe she'll show up again?"

Clary suggested from where she sat by Simon. It was a suggestion, and it was more than anyone else was putting on the table, and Jace and the Others were demanding to know who she was... and what she was.

"Look for anyone who has looked like they were thrown around an Alley because she looked pretty beat from what I seen."

Isabelle interjected agreeing with Clary's plan, Seeing as it was the only card on the table and fitted in what they were planning to do any how.

The blonde had made it home and she was worn out, the vampires had put up a good fight and in the end lost but she was going to feel it in the morning. She walked through the front door shutting it behind her and threw down her bag and jacket and began peeling off her clothing as she headed to the bathroom. She needed to clean up. Aderes looked like Hell, like she had been dragged through a cactus field backwards. She felt like it to. Wincing she peeled off her last layer and started a bath. Just what she needed a relaxing bath to extract the grime from her with before bed. She grabbed her usual kit and sat it on the edge of the clawed foot tub. and once she sank down in the heated water pulled out the tweezers and began extracting glass and gravel from the cuts and gouges she had on her body from the fight.

Aderes sat in the water till it was pink from blood and swirling with dirt and grew to cold for her liking before standing and getting out, toweling off and changing. she grabbed a quick dinner and ate just as fast before she went to her room and crawling in bed, a stake under her pillow and a knife on her bedside table just in case, even though all her doors and windows were locked and she had made sure of it, so as to prevent unwanted visitors. Even if she was always ready for them.

Morning came quickly for those at the institute and it wasn't long after breakfast that Clary and Simon arrived. They were regulars at the institute seeing as Clary was Jace's sister and Simon a close friend to the group. They sat around the dining room table discussing the situation at hand and how to handle it if things didn't go smoothly. All intending to go well prepared for just about anything that may arise from their unknown new friend.

The day went by in a whirl wind of discussion and raiding of the armory before it came time to head back to the club. The group was anxious and it showed they arrived and got in quickly and began scoping the area while blending in with the growing crowd, staying within ear shot of each other. Hours ticked by and they began to think it was going to be a waste of time they could have been spending on something else but soon their waiting paid off, She walked through the door, looking unscathed and a better sight than what she had been, "That's her." Isabelle confirmed as they watched from where they all sat at a table. One of those high ones with the bar stools at it.

Aderes had started to not revisit the cub so soon - the night before replayed in her mind, the people who had chased after her from the alley. She did not know who or what they were and they seemed to interested in her for her liking. She wasn't sure what they were and by the looks they had given her before she had fled the alley like a monkey out of a canon, they didn't know what she was either. She wanted to keep it that way even though curiosity was like a demon locked in a closet, like an animal in tis cage telling her otherwise. But she had gone against what she would consider better judgement and went to the club anyways.

She had walked in as always scoping it for things she could slay as she did, like she did with every building she entered. She grabbed a "minor friendly" drink from the bar and made her way to a table for the time being and took a seat. Enjoying the thrum of the music and the over head lights while she sipped at the soda she had gotten. Only standing unaware at the moment of being watched and headed to the dance floor losing herself in the crowd. She had completely lost herself in the thrum of the music till she felt someone come up behind her causing her to go rigid.

"That was pretty smooth work you did in that alley last night."

The voice obviously male said to her, as she looked around she became aware of four other sets of eyes watching her, she kept her cool though, "Meet me out back and I'll lay some of it on you." She snapped and with a swift kick landed her foot against the guy's knee cap and fled to the back where she knew she could fight without interuptions. Jace groaned as he was kicked but recovered before going quickly with the others to the back exit and found the girl waiting armed with a metal rod. Aderes barely gave them time to get into the alley before she spoke,

"Who are you?"

She demanded in an unpleasant tone.

"We could ask you the same thing."

Jace remarked to her in a similar tone as he pulled out his Stele.

CLOSING STATEMENT : I hope you enjoyed the second chapter, reviews mean a continuation of this story. so please review / comment and i will surely continue.