Jonathan wandered through the crowded club. 'Pandemonium' certainly was a fitting name for the place. He'd never been to this sort of thing before. It was, according to his mother, the place for mundanes, Shadowhunters and demons to mix –and it was for this reason that he'd avoided the club. He glanced around. Everyone seemed to enjoy themselves dancing crazily to some weird music Jonathan had never heard before, but none of them struck him as demon-like.

His eyes fell on a blue-haired boy holding what looked like a long stick –although if he concentrated enough he could see it was a razor-sharp weapon of sorts. Narrowing his eyes in suspicion, he began to follow the boy at a safe distance. He gripped his sword tightly, ready to pull it out at any sign that confirmed the boy was a demon.

He felt a hand on his shoulder and turned to see Izzy shaking her head. "Wait," she said. "Let me go first. I'll lead him into the 'NO ADMITTANCE' room and then you, Alec and Jace follow."

Jonathan nodded and held back, but didn't take his eyes off the boy, whom Izzy had just confirmed was the demon. Izzy walked up to the demon and battered her eyelids, smiling sweetly and beckoning with her finger. Alec and Jace appeared beside Jonathan –Jace was grinning like a little kid on Christmas morning.

They watched as Izzy led the demon into the 'NO ADMITTANCE' room. After waiting a few seconds, the three Shadowhunters followed, Alec bringing up the rear and shutting the door quietly behind him.

There was the sound of a loud gasp and the crack of a whip. "Shadowhunter," the demon hissed angrily, his dark eyes full of malice. "I knew you lot were here."

"Maybe you're not as bright as you thought," Jace said, still grinning. "If you didn't recognise Izzy here as a Shadowhunter. Or maybe you were distracted?"

The demon hissed and growled. "I would've been able to tell you were one. You're as arrogant as the rest of them." He continued to glare at them; however his eyes went wide when he turned to Jonathan. "Valentine," he gasped.

Jonathan sighed exasperatedly. "No, sorry, Valentine's not here. Would you like me to pass on a message to him for you?" he replied sarcastically.

The demon regained his composure. "But of course, you are Jonathan Morgenstern. It really is a pity you turned out so weak. Your sister has done us a great service."

Jonathan blinked, taken aback. "What? What are you talking about? How do you know Cl –my sister?"

The demon laughed. "All of us know of her," he said. "She has promised us a place in the higher ranks when she takes over the world."

Jonathan's eyes widened. What? Clarissa was planning to take over the whole world? His own sister?

"I've had enough of you talking a bunch of trash," Izzy growled. "Let's just kill him now."

"I agree," Alec nodded. "It's clear this demon is lying and selling us nothing but crap."

Jace twirled a seraph blade in his hand. He whispered a name and the blade of the knife began to glow brightly. The demon's eyes widened with fear and struggled against his constraints, but Izzy's whip was too strongly wound around him.

Jace plunged the knife into the demon and, with a short yell of agony, it disappeared.

*line break*

When they arrived back at the Institute an hour later, they made straight for the weapons room. As they were taking off their gear, Jace cleared his throat. "I don't suppose one of you have a spare Sensor on you, do you?"

Isabelle raised an eyebrow. "Tell me you didn't lose yours."

"Well if I didn't I wouldn't have asked," Jace said, but he was biting his bottom lip nervously.

"How'd you lose it?" Alec asked.

"I think that girl might have accidentally taken it," Jace replied, somewhat sheepishly. "We bumped into each other accidentally and it might have fallen out of my pocket without me noticing."

"So you were distracted by a pretty girl?" Jonathan smirked. "What was her name?"

"Clary," Jace said. "And I wasn't distracted. She was apologising over and over and I had to tell her everything was cool. She has the Sight by the way…Jonathan are you all right?"

Because Jonathan had gone very pale at the mention of the name. Clary…occasionally he had heard his mother refer to his demon-sister by that. Sometimes he would find her sitting on the floor, a small box lying open in her lap and a small lock of red hair –identical to Jocelyn's but Jonathan knew it was Clarissa's –clasped in between her quavering hands. It was during these times, Jonathan knew, that Jocelyn was thinking of the daughter she could have had –the daughter that could have been Jonathan's little sister. The daughter that died the moment she was born.

"Hello," Jace waved a hand in front of Jonathan's face, jolting him from his thoughts. "Anybody in there?"

Jonathan looked around at Alec, Isabelle and Jace. He wanted to tell them. He really did. But he didn't know what it was that was stopping him. Was he…could it possible he was actually feeling protective of his sister? But why was he feeling this way? Clarissa was a demon. She was unable to feel anything human. She wasn't human. Jonathan barely even knew her –they'd spent so many years apart. And yet…could it just be his brotherly instinct to protect his little sister, even though she was evil? Maybe he was holding onto the small hope that there was still a tiny bit of human left in her, and if he told Alec, Izzy and Jace –who were all demon-hunters –they would try to hunt her down without giving her the smallest chance to be human.

"I need some time by myself," he said, walking out of the weapons room without waiting for an answer.

As soon as he entered his room, he realised there was someone already inside. His eyes widened at the sight of Clarissa sitting on his bed, but she looked different. Her small body seemed tense and she played with her fingernails nervously.

"Well, look who decided to show up," Jonathan said.

Clarissa jumped up off the bed. "Jonathan," she said, her voice for some reason sounding desperate. "Please, I need your help."

"Oh?" Jonathan raised an eyebrow sceptically. "You need my help is it?"

Clarissa bit her lip. "I know you probably don't believe me, and I don't blame you. But please, I don't know how much long this will last."

Jonathan frowned. "What do you mean? How long will what last?"

"This." Clarissa indicated to herself. "This is me, Jonathan, the real me. I managed to gain back some control but…I don't know how long I can do it before…well, you know."

Jonathan didn't know how to respond. He looked carefully at her face, trying to detect any sign that she was lying. His eyes widened when he saw that her eyes were green –the exact same green as his and his mother's. They weren't the emotionless black from before.

"Clarissa?" he said uncertainly. "It…it's really you?"

Suddenly she jumped onto him, wrapping her arms around him in a tight hug. Recovering from his initial shock, he hugged her back. Relief flooded through him. He did have a sister. She wasn't completely gone. He'd always wanted a younger sibling to look after and now, after sixteen long years, he finally had one.

"I'm scared, Jon," Clarissa whispered. "My whole life I've never felt in control of my body. And now I don't know how long I have before…before it takes over again."

Jonathan looked into his little sister's green eyes that were so much like his but held so much fear. "I won't pretend to know what to do," he said gently and reassuringly. "But I know I will do whatever I can to make sure the demon in you is gone forever. Deal?"

Clarissa took a shaky breath. "Deal." She hugged him one last time before heading to the window. Just before jumping out, she looked back at him, grinning. "By the way, Jace is cute." And then she was gone.

Hey, sorry if you've been waiting a long time but here is the next chapter. I know this may be a little short, but I hope you like it. And I know it's weird that Clary would be scared and all that, but I really wanted her to have a human side as well because Clary is one of my favourite characters in the original TMI series and so I couldn't make her a completely evil character in my story. Anyway, hope you enjoy it and please review.