Sorry this is just something I randomly came up with. It should be alright but anything you wanna comment on just review or message me. But this is still new to me so please review if you like it. Oh just to let you know there will be lemons later on, it will get more graphic as the story plays out sooooo. Enjoy!

Disclaimer: the characters of mortal instruments all belong to Cassandra Claire.

Clary pov.

Clary kissed Simon goodbye, not caring that her mother and Luke were watching them from the kitchen window. She just felt. She felt Simons soft lips under hers, his arms wrapped around her waist and his glasses slightly poking her in the nose. Simon pulled back first "see you Clary, don't worry I'll be back before you know it. Promise" he leaned down and gave her one last kiss before he walked down the street towards the train station. Clary watched him go with a feeling of dread in her stomach. She needed Simon, since she'd met Isabelle lightwood Clary had become more ….. Well more like Isabelle she'd go and buy something on a whim or go to a party without thinking about it. She wasn't like she used to be, scared of everything and only having Simon to keep her company. She had changed and Simon was the only one who could stop her sometimes.

Clary walked back inside slowly, she needed to think of what to do. She had to keep herself occupied for a month. She knew that being busy for an entire month was going to be very unlikely done but she had to try. She could watch TV? She could draw?

Bring, bring, bring, bring Clary turned in direction towards the ringing phone

"Hello?" Clary answered

"Clary! Its Isabelle!" she seemed extra chirpy today.

"Hey, what's up?"

"Oh! Alines party is tomorrow night. You have to come with me" Izzy yelled

Clary groaned "but its Aline's! She really hates me."

"No she doesn't. She doesn't like you but….." Izzy trailed off "anyway please! It'll only be for a few hours anyway my brothers are coming back from college too, so you can meet them! Oh Clary you'll love Alec's boyfriend Magnus he's amazing!"

"Really? I didn't know he was gay! He's so hot though!" Clary complained briefly

"No you've seen pictures of Jace not Alec. Alec could be my twin we look that much alike" Izzy's voice was quiet as she thought about how much she actually missed both of them, she had max but that was it. "Anyway. You're going. I brought you a great dress and you'll wear it even if I have to pin you down and put it on myself"!"

"You can be scary sometimes Iz." Clary commented "fine I'll go. But I'll have to stay over yours mum won't want me to drink so."

"Yeah sure! Okay ill pick you up after school!" and after that the line went dead.

Clary slowly put the phone away and walked up to bed not looking forward to seeing the dress Izzy had brought for her at all.

Clary sighed as she sat in Izzy's room waiting for her to retrieve the dresses from her mum's car. She really hated Izzy's room; it was purple and black with glitter EVERYWHERE! She looked at the mirror in front of her; around the outsides were pictures of Izzy, Simon, Maria, Jonathon and Clary. In everyone Clary was with Simon, their hands interlocked, their mouths touching and sometimes just looking at each other. She smiled

"Clary!" Izzy yelled from outside the door. She quickly got up and opened it for her, Clary watched stunned when Izzy dropped all the contents of her arms onto the bed.

"Okay turn around and do exactly what I tell you to! And afterward you'll look amazing!" Izzy grinned while Clary squeezed her eyes shut and let her dress her.

"Wow!" Clary smiled timidly at herself in the mirror. She wore a short tight black dress that hanged off her boobs; boobs she didn't even know she had, with bright red high heels and a matching purse. Her make up was done naturally, with a hint of eyeliner and mascara but her lips were ruby red. She looked amazing. She looked tall too. Not as tall as Isabelle but taller than she really was.

"Okay gorgeus i'm going into the bathroom don't mess it up!" Izzy slammed the door behind her as Clary slowly walked downstairs. She'd wait for her down there.

"Clary! Come and meet my sons!" Maryse yelled to her from the kitchen. Clary went to meet them barely noticing that everyone went silent when she entered.

"Hey" she said calmly to break the silence and eyes.

"Honey don't you look marvellous!" Maryse smiled happily and gestured to the two boys standing behind her. One was tall, black haired, well built, bright blue eyes and a warm smile. Alec. She knew him instantly because he looked so much like Isabelle

"Alec. Nice to meet you." She said politely offering her hand which he took

"You too. See my sister had fun" he smiled

"A little too much fun I think." The other boy responded. Clary looked. He was the same height, a bit bigger built but he had golden hair and the most golden eyes she'd ever seen. Jace. He'd grown up from his picture but he was still beautiful.

"So your Jace then?" she smiled and offered her hand again which he picked up bent and kissed it. Looking up from her hand he winked.

"At your service." He stood up and walked to the fridge where got a beer for himself

"Well okay then I'm gunna see if Izzy hasn't fallen down the loo or something." Clary excused herself and returned to the bedroom. This was going to be an interesting night.

Clary stepped out of Jace's car and walked up the small path to Alines house. She had the best house after Izzy. They were both rich and could afford such luxuries as five bedrooms, everyone on suite and a bar. Not to mention the pool.

She quickly walked past all the partiers and straight to the bar where she grabbed two drinks. She downed them both before she met the dance floor. Someone grabbed her wrist and pulled her into the throng of partiers. Clary looked up to see Sebastian's face smiling at her. He had to be the creepiest guy at school with his greasy black hair, styled like Justin beiber and his dark brown eyes that gleamed with drunkenness.

"let go" Clary tried pulling her hand free but he was too strong , then before she could kick him or something he had her in a tight hold with his mouth coming down on hers. Clary closed her mouth immediately and began hitting him and pushing at him. He didn't budge.

"Hey! Dude let her go" Jace growled and shoved Sebastian back, as soon as Clary was free Jace pulled her away and outside were it was quieter. "You okay?"

Clary shook "yeah. Thanks good he is such a creep." She started shivering and wrapped her arms around herself protectively.

"Come let's get you a drink to warm you up." He pulled her hand down and held it as he wound through the dancers to the bar where he got three drinks each.

Clary downed them. "Again thanks. I don't know why he tried that."

Jace shook his head "because you look amazing. Seriously, I want to …" he trailed off as he looked me up and down.

"Want to what?" Clary's voice shook slightly as she looked at him look at her.

"This" Jace leant down and placed his lips softly on hers. She kissed back not really sure why. She was with Simon. But she wanted Jace like she'd never wanted Simon before. Her body begged to be touched by him and felt numb when he removed his touch. Clary began to kiss harder, her intensity becoming more and more. Jace moaned against her and pulled her into his embrace.

Clary wasted no time in placing her hands in his silky hair. But when he moved his lips to her throat she pulled slightly and he laughed

"Clary your drunk" Jace commented while he kissed her again.

She laughed at that, she didn't feel drunk. She felt happy, the happiest she'd been in a long time. She felt a clean hot desire for Jace, even if she was cheating she just couldn't seem to stop, her body yelled at her to never stop but her mind screamed at her to stop that this wasn't right.

Gently Clary pulled back and took Jace's hand. She'd been in Alines house before so she knew were people didn't go at parties. The basement were the spare room was. So she took him down there. She needed a private place for them. She needed to do what her body wanted. So she ignored her head and became even happier as she descended the stairs. She knew what she wanted to do. So she clarrisa fray, slept with Jace, she cheated on Simon. And she became what she promised to never become. A cheater.

Thanks for reading! Please review ! Jace and Clary want you to…..