I leant my back against the wall and crossed my arms against my chest, trying to look comfortable in my supposed cousin's house. I took in the newcomers. It's clear that three of them were siblings: the dark-haired boy who looked eighteen, the girl who looked about sixteen and the young boy who couldn't be more than nine. The Lightwood children. My father said he and their parents had been friends once, but they betrayed him and turned over to the Clave.

I recognised the other boy. The way my father spoke of him, I'd nicknamed him Angel-boy because he'd seemed like a 'goody two shoes'. I looked closely at him, wondering how my father could have picked out that he was 'perfect'. The way he stood and the easy grin on his face made him look, if anything, arrogant.

For some reason, I kept glancing towards the door, as if any minute the door would open and a girl would walk in. A girl I have never seen in my entire life. A girl I didn't know existed. A girl I only just found out today was my sister. What would she look like? Would she look like our father, like me? Or would she look like our mother, who I never got a chance to know?

"Where's Clarissa?" Aline asked. "I thought she was coming with you. I was really hoping to meet her. It's not everyday someone outsmarts Valentine, you know."

Something in me wanted to strangle her, wanted to hurt her for saying such things about my father. But I held myself back. I couldn't afford to blow my cover before I even met my sister. Instead, I looked at the Lightwoods and Angel-boy. It had crossed my mind that Clarissa hadn't come with them, even though were all from New York.

"She changed her mind," Angel-boy, Jace, said. "She didn't want to have to face the Clave, who would surely ask her questions." There was something in his eyes that made me think he was lying. Maybe it was the way he flicked his eyes around trying to avoid eye contact as he spoke. Alec and Isabelle glanced sideways at him.

Aline, however, seemed to believe him. Her shoulders sagged slightly. "Oh, that's a shame," she said. "I really would have liked to meet your sister."

At that I perked up. What did she just say?

"Wait," I said, speaking for the first time since they had arrived. "Clarissa is your sister?"

Jace nodded, though for some reason he wasn't enthusiastic about it. But…if my father said that Clarissa was my sister, and Jace was her brother…I mentally shook my head. No. Jace couldn't be my brother –not by blood anyway. We looked nothing alike. Maybe they just considered themselves siblings because they were so close. I'd heard of people saying that. My father and Lucian Graymark used to be parabatai. They were practically brothers.

Maybe that's what Jace meant.

*line break to the next day*

It wasn't until the afternoon that I met my sister for the first time. We were just talking casually, much like yesterday. Alec, being eighteen, was attending a Clave meeting. Both Isabelle and Jace looked at him enviously for some reason. Honestly, in my opinion, a Clave meeting sounded boring. But then I guess it would be nice to know what was going on.

There was a knock on the door and Isabelle went to open it. When she came back in a minute later, there was another girl with her. She had fiery-red hair and bright green eyes –like mine. She looked tiny compared to Isabelle, but her face and Shadowhunter gear gave the impression of someone older.

When Jace saw her, his eyes widened with shock and anger. "Clary," he began, his fists clenched tightly.

Clary? And then realisation hit me. Clarissa! This was my sister. I jumped up from my couch eagerly, but stopped myself from hugging her. No one was supposed to know who I really was. Not even her. I held my hand out.

"Hi, I'm Sebastian. Sebastian Verlac," I said, sounding cheerful. "So you must be the famous Clarissa who stopped Valentine from completing his evil plans." It felt weird referring to my father as if he weren't my father. I felt guilty too, referring to him as evil. I mean, he wasn't the best dad in the world, but he still raised me and took care of me without my mother.

"Um, yeah, I guess," she replied uncertainly, as if being called famous made her uncomfortable.

I realised Jace was glaring daggers at her and part of me wanted to slap him. I felt a strange compulsion to protect Clarissa and seeing Angel-boy look at glare at her like that made me instantly not like him. I noticed Clarissa was avoiding his eye contact in the way she greeted everyone except him.

"Just Clary is fine," she said. "Clarissa sounds too formal."

I grinned. That's one thing we have in common. We both dislike formalities. "Well then, 'Just Clary', welcome to Alicante. This your first time here?"

Clary nodded. "I was born and raised in New York. What about you? Were you born here?"

I almost blew my entire cover by answering yes, but of course, that's not what I'm supposed to say. "Nah, I'm French. I'm just visiting. This is Aline Penhallow, my cousin."

Aline seemed to take this as her cue and leaped off the couch and bounded over to Clary. "Hey, Clary. I've heard all about you. How did you manage to outsmart Valentine? It's never been done before, you know. He's very clever."

I smiled inwardly. I know most Shadowhunters thought my father is "the most evil guy on the planet", and whatnot, but I still felt proud whenever people complimented him, doesn't matter how they said it. I nodded, pretending to share Aline's excitement.

"How did you do it? He had, like, a whole horde of demons under his command."

Clary seemed to flush with embarrassment. I guess she isn't too used to being the centre of attention. Before she could answer, Jace interrupted.

"Clary, can I speak with you privately?" his voice was tight. He walked into one of the spare rooms he was sharing with Alec without waiting for an answer.

Sighing, Clary looked at us apologetically before following Angel-boy.

"It's sad, really," Isabelle said, speaking for the first time.

I looked at her, confused. "Sad? What do you mean, sad?"

"That they're in love with each other."

"So?" I failed to see what point she was trying to make. "I'm sure people fall in love all the time."

Isabelle sighed exasperatedly. "Yes, but not siblings. Haven't you heard? Clary's name is Clarissa Morgenstern –Valentine's daughter. And Jace…Jace's real name is Jonathan Christopher Morgenstern. Valentine's son."

What?!

Hey, so here is the second chapter. I know it seems like I'm putting Jace is in a bad light, but this is how I think Jonathan would have first thought of him in CoG. I love Jace, really. He's one of my faves! So anyway, hope you like this story and please review!