Authors Note : Hey Guys! This is my first fanfic,- because I've never been brave enough before - so I don't really know what I 'm doing. I wanted to do a Sizzy AU, so please read and review it (and hopefully enjoy it).

Disclaimer: I don't own The Mortal Instruments or any of the characters; they all belong to miss Cassandra Clare.

*SIMON'S POV*

First day back at school and my only plan is to stay out of the way. It's safe to say that me and Clary are far from popular- our idea of a successful day at school is not getting shoved into the lockers or getting tripped up in the canteen- so hopefully if I stay hidden enough I can get through senior year in one piece.

I quickly pull on my sweater and go down to the kitchen. I'm just about to pour my cereal when I hear a car horn outside. Crap. I'm running late. I grab a cereal bar from the cupboard, pick up my keys from the kitchen table and run out the door to the car. When i get there I see my best friend sitting there with a greeting grin.

"Excited for the first day?" she asks with a sardonic smirk on her delicate face.

"Yep... 'course" I retort sarcastically.

She laughs her cheerful, contagious, and starts up the engine.

*AT SCHOOL*

Well one thing's for sure; I definitely haven't missed this place! I'm just looking at my new timetable when suddenly I feel it being snatched out of my hands. I snap my head around to see Alec Lightwood standing directly in front of my with a condescending grin on his annoyingly attractive face.

Alec. That can only mean one thing... Isabelle Lightwood.

(Wherever Alec goes, Izzy isn't too far behind and vice versa.)

Alec and Izzy Lightwood are the two most popular people in the school- and also the most beautiful- both with their piercing blue eyes and their jet black hair. They normally stay as far away as possible from people like me, so I'm surprised for a moment to see Alec staring into my eyes. Then all of a sudden I find myself pinned up against my locker, with Alec's strong muscular arms across my front keeping me firmly in place.

"Get out of my way Mundane" Alec hissed

"Mundane? What do you mean?" I question, not understanding what Alec is talking about.

"Ignore him, it's nothing" Izzy steps in speaking directly to me for the first time, causing me to be unusually lost for words. "Come on Alec, don't waste your time."She turns her eyes away from me and stalks off in the opposite direction with Alec right behind her.

"What was that all about?" Clary comes to join me by my locker, glancing behind her in the direction the Lightwoods have just left.

"I have no idea, but you'll never guess who just actually spoke to me!?"

"She spoke to you? What did she say?" Clary demanded excitedly.

"Well I mean it wasn't quite the big 'first conversation phenomenon' I've been planning for, but it was still a conversation right?" Clary laughed in reply and we walk towards first period together.

I'm just about to walk into the class room when I feel a cold hand suddenly grip onto my forearm. I jump a little in surprise, when I get tugged out of the doorway and find myself squashed up against the wall with Isabelle Lightwood's face 6 inches from mine and her slim finger muting my objections.

"We need to talk Simon" Omg, she knows my name? How does she know my name?

"Erm... We do? About... what?" I do my best to stay calm

"Just follow me" She takes my hand and leads me towards the girls toilets.

"Erm, Izzy- Isabelle" I hesitate, not wanting to question why the most beautiful girl in the school is taking me into the girl's toilets alone- this is everything I could have ever hoped for- but I do feel I should query.

"Just shut up for a minute will you? Do you ever stop talking? I have something to show you Simon. It's time you knew"

Ok so I know it isn't very good or very long, and I have no idea where it's going to go from here, but i hope you enjoyed it, please review it and let me know what you think, and any suggestions for how to continue, thanks!