A/N Hi everyone! So I had this idea the other day, I was wondering what it would be like if Jonathan/Sebastian and Clary had been raised together by Valentine, so this kind of just came into my head.

Please enjoy it!

He looked up at her sharply. "What do you think it would have been like if Valentine had brought you up along with me? Would you have loved me?"

Clary was very glad she had put her cup down, because if she hadn't, she would have dropped it. Sebastian was looking at her not with any shyness or the sort of natural awkwardness that might be attendant on such a bizarre question, but as if she were a curious, foreign life-form.

"Well," she said. "You're my brother. I would have loved you. I would have...had to."

-City Of Lost Souls

Jonathan Morgenstern had always been a lonely child, he had his father of course but nobody else, though no matter how much he loved his father he couldn't help but hate him, for his strict teaching, for isolating him away from everyone and everything else, for raising the other boy, the angel boy, he'd be lying if he said he wasn't jealous of the other boy, for stealing away his father's attention, he wasn't Valentine's real son, so why should he be given attention. And most of all, he hated him for the demon blood that ran through his veins. At just four years of age he was aware of it, he had found the journals, hidden away in his father's study, he had been reading since he was 3, that was how early you learned when you were the son of Valentine Morgenstern, he knew that one day he would be evil, emotionless, but right now, he was scared. Scared of himself, and that was a lot for a 4 year old to deal with.

His father had been out all day, he had stuck to himself, the maids had tried to speak to him, ask him questions about what he wanted to do today, but he stayed in his silence. It wasn't until he was in bed that night that he heard his father's arrival, he heard as he barked instructions at a maid, and he heard as he came up the stairs and down the corridor.

Walking as quietly as he could he snuck away after his father, he was holding something but he couldn't see what, Valentine entered one of the guest bedrooms, he was confused, nobody went in there, they didn't have guests, and it was empty. It was about 10 minutes before his father left the room and walked away.

Giving in to his curiosity Jonathan snuck into the room, it was completely empty, apart from a pink crib in the centre of the room, inside fast asleep, was a toddler. A girl. She had short, red, curly hair on top of her hair, she slowly blinked open her eyes. They were bright green and wide. She looked confused, as if she didn't understand where she was. The girl looked as though she was just one or two years old.

Suddenly, she opened her mouth and began to wail. Jonathan covered his ears with his hands, she was so loud. He didn't like this baby, she was loud and would just steal more of his father's time. Why was she even here?

"Shut up baby!" he shouted,

At that moment Valentine came running in, scooping up the baby

"Honestly, be quiet Clarissa! You will have to learn!" the child, who he now knew was called Clarissa turned to look at him, she stopped crying and giggled at him. What was she doing?

He frowned at her trying to work out why on Earth she was giggling. He stopped thinking when his father turned to see what she was giggling at and saw him stood in the corner.

"Jonathan! What are you doing out of bed! And in here? Did you follow me boy?!"

"I'm sorry father. Why is there a girl here?" he sighed running around over his face

"This is Clarissa, your little sister" Jonathan gave him a sceptical look,

"Is she really? Or is she like the other boy?"

"No, she is really your little sister"

"She doesn't look like us"

"No, she looks like her mother. Your mother"

"Well where's she?"

"We've been through this Jonathan"

"Sorry father. Where did it come from?"

"By the Angel! Jonathan, she's not an it. JUST GO TO BED!" His father gave him his hard look and Jonathan quickly left the room, as he left he caught Clarissa staring at him in wonder.

A/N So it's quite short but it's just the prologue, so shall I continue? Please review!