Hi! This is my first smutty/fluffy/lemon thing I've done, I've so far written 18chapters drafts but my friend just edited the first chapter- I'm posting the first chapter to see people's reactions so if you could PLEASE PLEASE REVIEW that would be AMAZING! And would help a lot and help me decide if I continue with it or not.

Overview- This story is set in TMI:City of Heavenly Fire Jace and Clary haven't been able to touch for weeks now, not even hold hands and all this talk of Sebastian has brought up some pushed down memories in Clary, Sebastian and clary had almost gone there, and clary was willing (in City of Lost Souls), and now she was a part of the team that was I charge of his death. What will she do, no one else had ever made her feel like that, not even Jace. Will she stand by her fellow shadowhunters, friends, family and boyfriend or will she fall into a pit of lust and passion with Sebastian. *this a lot of sexual context, contains incest-clary and Sebastian, so if you don't agree with it don't read it*

So here it is - Incestual Desires: Chapter one

Clary leaned against the wall in the Institute's library, trying to pay attention to the conversation but her mind just kept going back to that night.

It had been 6 weeks since Sebastian left the note. 'I'm coming...' was all that was written on it. It had also been a week since she and Jace could even touch each other (a teenage girl has her needs!). Everyone was in a panic; Magnus and the Silent Brothers were trying everythingthey could to find Sebastian, but at the same time trying to help Jace. But they had come up with nothing. Magnus however was getting generously paid for his efforts; considering he wasn't doing anymore favours after he and Alec split. Maryse and Alec got into a heated argument about what was more important, figuring out how to help Jace or finding Sebastian.

Sebastian...

Every time she heard his name, her mind would snap back to that night. It was the night Jace, herself and Sebastian went to 'the Bone Chandelier'; she had passed out on the bed with Jacebut had woken a few hours later. She was still a bit high from the club, she had tip toed her way down the hall to Sebastian's room. She had been 'curious' as to what he was doing. She slowly pushed the door open to find him reading a book on his bed. His head jerked up to see his little sister standing in his door way, head tilted to the side looking at him with a childish grin, he smiled that devilish smile which made her blush. Making her hair look redder than italready was.

Her head still tilted to the side she asked, "Watcha' doin'?"

He smiled at her, "Looking at my beautiful, sexy little sister."

She crossed her arms and leaned on the door frame, "Why do you do that?"

He shrugged as he stood up from the bed, "I don't know what you're talking about?"

She pointed her finger at him childishly, "That! That right there!"

She tensed up when he slowly but seductively walked towards her, "What is it little sis?"

He leaned over her, pinning her to the wall, "Do you mean this?" He gently ran his hand up her arm, send tingles through her body.

She stood there, she couldn't move, she wanted to run back to Jace but her body refused.

He now was brushing his hand against her thigh, going higher and higher every time, he leaned forward and whispered seductively in her ear, "I want this; I know you want this too little sis." He then placed a soft kiss on her neck making her body tingle.

He looked her in the eyes, with a look of lust, his hand getting higher and higher. He slammed his lips down on hers, she gasped at the force of his kiss. Her eyes grew wide with confusion at what she was doing. His hand had slowly made its way up her dress, his hands rubbing and tugging her petite, soft breasts. Her hormones took control of her body, as she flung her arms around his neck, pulling him closer. He slowly pulled her off the wall and picked her up, her legs wrapped around his waist. She flung her head back and moaned as he sucked on her pulse, she felt him smile against her neck.

She was now looking into his hungry, lustful eyes. He took her by surprise, as he grabbed the back of her head crushing her lips down on his, their tongues entangling with each-other's. He slowly moved his hand down her back, unzipping her dress. It fell from her shoulders, resting on her hips. The next thing she knew Sebastian had thrown her on his bed, she stared up at him panting, she saw the hunger in his eyes just before he pounced on top of her. His legs pinned her hips down, she could feel him growing against her, she moaned at his touch. Soon they were in another heated kiss; he pulled his shirt off over his head effortlessly, as she shimmied her dress down her luscious legs, both of them simultaneously throwing their clothing on the floor. He looked at his little sister lying below him in nothing but a lacy red bra and panties; he stared in both awe and lust. She had looked up at her big brother; she reached up and ran her hand up his hard, muscular, tan chest, from his naval to his neck, pulling him down on top of her once again. He kissed her with passion, Jace had never kissed her like this, and never made her body tingle this way. The thought of Jace flashed across her mind to quickly for her to comprehend. Sebastian started to trail kisses down her neck. He stopped at her pulse and started sucking and nibbling on it, making her moan loader. He hadloved the noises he could make his little sister make. He ran his hand down her outer thigh, slightly spanking it, making her giggle with excitement. He smiled again, against her neck at the noises she made when he touched her. He slowly moved his hand across her lace panties; he could feel her arousal through the fabric. He moved back up to her lips and crushed his lips onto hers, his hand rubbing, teasing, her through the fabric. She arched her back as he touched her, she smashed her lips against his and thrusted against his hand. She felt a need to return the favour, so she reached down and unbuttoned his jeans. Her hand slid into them,feeling his cock only grow with her touch. They were both now feeling each other, exploringover their underwear. After moments of exploring, Sebastian decided to remove her drenched fabric. So he slid down her, trailing kisses from her chin, to her neck, to her naval and then finally he gripped the edge of the lace and pulled it down to her ankles. He quickly yanked his jeans of and threw them on the ground, near the clothing that had been discarded earlier. He slowly started trailing kisses up his sister's soft beautiful legs, his kisses started to linger, as he got closer and closer to her. He finally reached her, and before he started, he looked down at her in awe.

As he was about to go down on her, Clary jerked away from him, 'What am I doing!' She quickly grabbed her clothes off the ground and ran back to Jace's room, got dressed and laid back down with Jace, she kept telling herself, 'That never happened!'

As clary darted out of his room, Sebastian was left confused and angry.

'That bitch! Such a tease! I will have her! She will be mine!'

"Clary! Clary!" Clary slowly came back from her day dreaming state, to the sound of Alec's voice.

She looked at him a bit dazed, "What?"

"We need to go! They found him! They found Sebastian!"

"What? Where?"

"It's not completely narrowed down, but they narrowed it down to a 100m radius of a huge warehouse on the edge of New Jersey. We're going on a search party."

As they strode out of the institute, geared up and ready to fight. Alec turned to her and coldy said, "Remember, it's kill on sight."

Could she do it, could she kill the only person who ever made her feel that way, made her feel alive.

did you like it?!are you intrigued to read more? PLEASE REVIEW IT WILL HELP ALOT! AND WILL DEPEND ON WHETHER OR NOT I POST THE OTHER CHAPTERS!