Chapter 1 - "You are a Kosterov," - Charlotte's POV
Mortal Instruments Fanfiction
Jace/OC
I do not own The Mortal Instruments but I do own Charlotte Kosterov, Elizabeth Roux and some of the plotlines.

"My life was a mystery even as I was lived it,"
 - Melissa Gilbert

"Charlotta how wonderful of you to join us," The warlock with the recognisable cats eyes announced. Charlotte Kosterov spun on her heel to face her long time ally, Magnus Bane.

"I would never miss one of your parties," She announced her long dark hair matching with her, almost black, eyes and pale skin. She wore a short, lace, black dress with a leather jacket and piercings all the way up one ear. Her Nephilim runes were visible through the lace gloves she wore and her weapons were just as visible, especially her Katana and Swallow sword strapped to her belt. "Have you seen my Parabatai I lost her the moment I entered this place?"

Magnus frowned picking at his sparkly nails, in fact everything he wore seemed to be sparkling, "Was she wearing a blood red dress, with black boots because if so I saw her talking to one of the vampires I invited,"

"That's her," Char exclaimed as she took a sparkly drink from one of the many trays going around the room. She examined it holding it up to the dim light to check for firstly poison and secondly some kind of faerie drug. She detested them. "I presume that we are not in the presence of any dogs then,"

"You presume correctly," Magnus replied, "How have you been sleeping?" Char glanced around for anyone who looked as if they were listening to the conversation.

She turned to gaze back to Magnus, "Better than usual, the medicine you gave me has helped with the screaming. I no long wake up Elizabeth in the middle of the night so it mean's I don't have to lie as much. I don't suppose you've finished examining my mother's journal. I want to see if she says anything on the matter,"

"I'm nearly through it, you can take it whenever you want," Magnus replied downing a glittery pink drink in one. Char rolled her eyes as she took another small sip of her drink. Before she could reply and ask him about the meanings of the unknown runes the doorbell rung loud and clear above the noise of the crowd. "I'd better get that, it will probably be some blood-suckers who have wanted to come in style,"

Char glanced at her Parabatai, Lizzy, who was laughing with one of her vampire friends, "I'll come, it's better than watching 'Lizabeth talk with vampires."

"Because you'd much rather it be you," Magnus smirked. Char looked at him in shock.

"I would never!" She announced, "I've gone of vampires anyways, so difficult to arrange dates," Magnus rolled his eyes.

"I remember you being obsessed with a certain Ra–" He started but was interrupted as Char smacked him.

"Hey!" She hissed, "I don't want the whole of downworld knowing," He didn't say anything but just smirked in return.

The warlock and the Nephilim made their way through the crowd and down the staircase to the front door. Char leant against the stair railing prepared to head straight back up the stairs. Magnus flicked his hand and the door flew open revealing five people. Char quickly looked them over, there were three shadowhunters who seemed to have as many weapons on themselves as she did. A small red head who looked uncomfortable in her clothing with next to no weapons and a mundane boy who stood behind the others looking more out of place than the red head.

The black haired girl reacted first, "Magnus? Magnus Bane?"

"That would be me," Magnus replied lazily as Char walked down the last few steps catching the attention of the shadowhunters. She met one of their gazes and it was black on gold as she exchanged a staring contest with a blond boy, who was pretty cute. All of them were quite good on the eyes. "Well, well. I don't recall inviting you,"

Char smirked, "Maybe they're a fan club I hear warlocks are very in nowadays maybe the High Warlock of Brooklyn has caught the eye of some Nephilim,"

"Who are you?" The red head asked and Char locked eyes with her. The red head seemed very fragile at first looks but seemed to have quite an attitude.

"This is Charlotta, she's the founder of the fan club," Magnus interrupted smirking at the black haired girl.

"Yeah join the Magnus Bane fan club for free glitter and all the secrets on how the High Warlock of Brooklyn makes his hair so sparkly," Char said sarcastically as she pulled the knife that had been holding up her hair out before she began spinning it through her fingers. Her hair was curled and layered falling to the small of her back.

"I have an invitation," The black haired girl announced but their was a shadow of an amused smirk on her face. She held out a white piece of paper and Magnus took it looking at it disgustedly as if that would make it burn up there and then. She gestured to the others, "And these are my friends,"

"I must have been drunk," Magnus concluded, "Come in and try not to murder any of my guests,"

The blond boy walked into the doorway sizing Magnus up as he did so. "Even if one of them spills drinks on my new shoes?"

"Even then," Magnus' hand shot out and plucked the stele out of the shadowhunters hand. The blond looked slightly shocked. "As for this," He tucked it in the boys pocket, "keep it in the pants, shadowhunter,"

Magnus grinned at them winked at Char and then made his way up the stairs. Char glanced at the person standing by the door. "I pity the downworlder who would dare spill a drink on your shoes," She smirked.

"They wouldn't dare, you never told us your name," He pointed out as she moved in front of him.

"Magnus already said and it's Charlotte but I could say the same about you, pretty boy," Char leant against the wall just in front of the blond headed nephilim. His eyes wandered her figure causing her to raise an eyebrow at him.

"I get that a lot, darling. The name's Wayland, Jace Wayland," He introduced holding out a hand. Char watched him carefully before shaking his hand. Part of her was tempted to make a James Bond reference but he probably wouldn't get it. She went to let go but he turned her hand over revealing the parabatai rune on her left hand. "You're a shadowhunter,"

"As are you, I've heard people talk about you and apparently you're easily disliked, oh and don't call me darling," She flashed them a smile and turned to walk up the stairs but Jace had to have the last word.

"What can I say, it's a gift and of course I won't, sweetheart,' He smirked. Char's jaw clenched as she glanced back at him.

She tucked the knife up her sleeve, "A sarcastic asshole, what were the chances, all you Nephilim are the same,,"

Char made her way up but not before she heard the other black haired girl smack him and say something about hitting on every girl he met and that the warlock wouldn't help then if he kept annoying him. The black haired girl made her way towards Magnus cutting through the crowd towards one of the pillars. His cat eyes glistened in the dark, he really needed to clean the floor to ceiling windows which were covered with a layer of dirt letting next to no light in.

"Finished flirting with the shadowhunter, Charlotta?" Magnus asked and Char shrugged putting her now empty drink on the side. She didn't like her name Charlotta and preferred people to call her Char or Charlotte but downworlders never listened to her.

"It wasn't flirting, I was just checking out the competition as me and Lizzy are usually the only Nephilim here and I know I'm better than Lizzy by far," Char smirked. The said parabatai was now still talking to the vampire, unlike Char, Lizzy didn't care much for dating or flirting. She was way to serious.

Magnus ran a hand through his glittery black hair, "You don't really count yourself as part of the shadowhunter community though. What is it your family says, they work beyond and outside the Clave but are not against it," He did a bad impression of Char causing her to hit him.

"I sound nothing like that and anyway I haven't contacted any of the clan in about six months," She shrugged. Her family was very clan like and very large. Magnus looked over her shoulder and Char saw the red head looking slightly lost.

"You like my party?"

The red head turned to see them and instinctively looked around for any of the shadowhunters who accompanied he here but saw they had been swallowed by the crowd,

"None of your shadowhunter friends are here," Char said earning her a glare from Magnus as the red head shuffled uncomfortably.

She smiled but it looked forced, "Is it honour of anything?"

"My cat's birthday,"

"Oh," She replied and looked around for a cat, "Where's your cat?"

Magnus moved off the pillar and walked forwards slightly, Char followed suit. "I don't know. He ran away."

"Can that thing even run? It's like a massive fluff ball," Char scoffed.

"Rule number one: no hate on the cat," Magnus ordered. Char had no time to retort as Jace and the black haired boy emerged from the crowd of downworlder said. Jace was wearing a flower necklace and had a smirk on his face (looking very smug) while the other boy looked a bit down. Clary instantly turned to them, "Have you seen Simon and Isabelle?"

Charlotta made a small sound as she found out two of their names. Jace pointed over at the them, the boy, Simon, was just bouncing on his heels while Isabelle was almost prowling around him. "On the dance floor,"

"Look," Jace started going suddenly serious, "We really need to talk to—"

He was interrupted by a roar, "MAGNUS BANE!" A deep voice exclaimed, a voice which belonged to a surprisingly short man. He pointed a threatening finger at Magnus. "Someone just poured Holy Water into the gas tank of my bike. It's ruined. Destroyed. All of the pipes have melted."

"Melted?" Magnus murmured seeming uninterested as Char gave a pointed glare at the shadowhunters. Jace responded with a look that said to be quiet. "How dreadful?"

"I want to know who did it," The man bared his teeth confirming Char's thoughts that he was a vamp. They were thin, canine like and almost yellow. "I thought you swore there'd be no wolf men here to tonight, Bane."

"I invited none of the moon's children," Magnus replied as he examined his nails again. "Precisely because of your stupid little feud. If any of them decided to sabotage your bike they weren't a guest of mine and therefore not my responsibility,"

The vampire let out a roar making Char smirk, "Are you trying to tell me that—"

Magnus moved his finger just a fraction almost impossible to see making the vampire stop mid roar. The vamp gagged clutching at his throat mouthing words but no sound came out. "You've worn out your welcome, now go," He moved his fingers and the vampire spun and continued out of the door as if he was being pushed.

"That was impressive," Jace whistled quietly.

"You mean that little hissy fit?" Magnus questioned glancing at the ceiling, "I know. What is her problem?" The black haired boy laughed but it took a second for Char to process the noise coming from him, it sounded slightly unnatural.

"We put the holy water in the gas tank you know," He announced.

Jace smacked him, "ALEC, shut up," So that was his name.

"I assumed that," Magnus said looking amused, "Vindictive little bastards aren't you? I'm guessing you would have done the same Charlotta so you're just as bad," Char faked a look of horror at his accusation. "You know their bikes run on demon energies, I doubt he'll be able to repair it."

"One less leech with a fancy ride," shrugged Jace, "My heart bleeds,"

"I'm sure it would if he got a hold of you," Char put out and Magnus rolled his eyes.

"I'm too precious to bleed," Jace returned and Char smiled at him before glancing at Alec as he spoke.

He looked slightly excited, "I've heard some of them can fly!"

"Merely an old witches tale," said Magnus. Char didn't believe him, most witches tales ended up to be true. "So is this why you crashed my party? Just to wreck some bloodsuckers?"

"No," Jace exclaimed and suddenly he was serious again, "We need to talk to you, preferably alone,"

Magnus raised an eyebrow at him as Char put her hands on her hips, so she wasn't invited. "Am I in trouble with the Clave?"

"No,"

"Probably not," Alec said at the same time but quickly let out a cry of pain when Jace kicked him.

"I agree that's unlikely," Magnus nodded before gesturing to Charlotte, "Is she in trouble, that is more likely,"

"Hey, just because I don't see eye to eye with the Clave doesn't mean I'd go against them," Char defended herself putting her hands up in a surrender.

"No," Jace said again, "We can talk to you under the seal of the Covenant. If you help us anything you say will be confidential."

"And If he doesn't," The female Nephilim questioned.

Jace spread his arms out revealing his runes all bold and black, "Maybe nothing, maybe a visit from the silent city,'

"That's quite a choice you're offering me, little shadowhunter," Magnus announced his voice sounding irritated and cold.

"It's no choice at all," Jace said.

"Yeah, that's what he meant," Char agreed, "I'm guessing this has something to do with Valentine,"

Both of the male shadowhunters exchanged looks before Alec spoke, "What do you know about Valentine?"

"Unlike you I enjoy the company of downworlders and they always know things. I know Valentine is back, I know he is after the mortal cup, I know he captured Clarissa Fray's mother – I'm guessing that's you," She pointed at the red head, "And I also know he's been trying to contact me,"

"What?" Magnus said sounding surprised as he was also new to this information. Char glanced at him with a sheepish smile.

"I was talking to Garroway, he got news that Valentine wanted to see where mine and my families alliances were, I guess because we don't really like the Clave he thoughts we may assist him," Char shrugged not seeming to care about this information. The two boys were looking at her warily. "Ok no point looking at me like that because I am not stupid enough to side with him… The rest of my family meanwhile may have other views,"

"And who are your family?" Requested Jace his almost golden eyes watching Char carefully. Part of her guessed he had his suspicions, there weren't many families that don't like the Clave and are Russian.

"I'd be surprised if you didn't already know, Wayland," She pointed out. The Kosterov family had family trees dating back to the start of the Clave, they were rich, powerful and strict. If you became a mundane – and you were a Kosterov – you would stay a mundane, you broke any rules and you were out of the Clan.

Jace confirmed that he knew, "You are a Kosterov,"

"That I am, pretty boy," Char could see how both Alec and Jace's attitude changed slightly, it was probably an instinct. If a shadowhunter didn't know of the Kosterovs then they must have been living under a rock for the past 500 years. The Kosterovs were their own private army, they had fought against Valentine the first time and the Clave hadn't lifted a finger to help when almost half of them were wiped out. That meant it was more than likely her family wouldn't help the Clave this time.