I don't normaly write fanfiction, but I was dissapointed with the amount of Mortal Instrument fanfics so here we are. I apologize if the characters seem OOC to you.

Oh, Yes? Why, In Our House, Familiy Meetings are a Normal Occurence.

A knock traveled through the halls to the library, where Jace and Clary were researching for their Shadowhunter training. Jace lay sprawled out on a large leather couch at the side of the room, fidgeting nervously. Curled up in an armchair, Clary scanned the thick tomein her lap intently.

Hearing the knock, Jace leaped out off the leather couch he was lying on. "Don't bother getting up, Clary. I'll answer the door."

Clary rolled her eyes in exasperation. The gesture was lost on Jace, however, as he had already sprinted through the doorframe. She unfurled her body and made her way to the main entrance, attempting a rough imitation of Isabelle's graceful walk. As she padded down the corridor she still managed to stub her toe. Hissing in pain, she leaned on the wall for support. As she nursed her injured foot, two voices murmured quietly. One was Jace's husky tones. The other was unfamiliar to her, a soft feminine whisper.

Clary peeked around the corner in time to see the petite blonde's flirtatious glance as she handed Jace a small package. A gift. Rage welled within her and she strode towards him. She glared at the two of them.

"Excuse me. I'm not interrupting anything, an I?" She didn't pause for an answer. "I don't know who you are or why you are here, but I have to take my brother away now. We were in the middle of a family meeting, so you really must be going. Goodbye."

The one-sided conversation was given a definite ending when Clary reached between the two and slammed the door. The bang echoed through the halls, leaving an awkward silence in its wake. Pivoting on her heels to walk away, Clary was stopped mid stride when Jace grabbed her shoulders, spinning her back around.

"What was that?" His eyes narrowed. "She was just delivering something to me!"

Clary flushed and stared determinedly at her toes.

"Well, if you're not going to say anything important, I'd better go. We have an extremely important family meeting that we can't delay." The sarcasm was heavy in his voice, as per usual. "Really, Clary, a family meeting? What was that about? Who even has those anymore?" A sly smile spread across his face as he realized something. "Wait a minute! You were jealous, weren't you."

Her face turned an even brighter shade of red, almost matching the hue of her fiery tresses. She glanced up. "I-"

"You were!" He crowed, then his eyes softened, displaying vulnerabilities that were only visible around Clary. "Don't be ashamed. In case you hadn't noticed, I positively burn with jealousy every time Simon talks to you."

"Jace, I-" She started, but he cut her off harshly.

"No, Clary, let me speak. You need to know how this," He gestured to both of them and his voice softened "is for me."

Clary's emerald eyes widened. Almost instinctively she leaned towards him and breathed in the cool scent that she cherished. Soap, smoke and the metallic tang of blood were combined to form his oddly comforting aroma. She closed her eyes and sighed. A Shadowhunter's scent.

Jace paused. She looked absolutely beautiful standing in the soft evening light. Positively glowing, her bright hair framed her face like a halo. How he was going to manage a platonic relationship with his angel of a sister was beyond him. A light flush stained her cheeks and when she leaned towards him, eyes closed, her soft pink lips were perfectly kiss-

No! Jace chastised himself. Sister, sister, sister! This is we both wanted.

He shook her gently and her eyes snapped open, surprised by the contact.

"Clary! You're not making this any less difficult. Look at me." He ran his hands through his already ruffled blond hair.

Clary's fingers twitched with the effort of keeping them from playing with the runaway strands.

"Before I met you, before I discovered that you were my sister," He spat out the loathed word. "I never imagined that I would be this jealous of a mundane, especially not a mundane so ordinary as yours."

She began to protest, wanting to defend Simon. Jace interrupted her gently this time.

"But I am jealous of him, incredibly so. He has so much more freedom around you than I ever could. He is allowed to follow you with his eyes without seeming overbearingly protective. He can kiss you without getting curious stares."

As if to prove his point, Jace brushed his lips slowly up the line of her cheekbone. A shiver of pleasure ran down her spine.

"He can hold you in public," Strong arms wrapped around her. "And hecan even dream about you without feeling ashamed, Clary. I don't want to feel ashamed of us."

"I know," Clary murmured, pressing her face to his chest. "I don't want to be ashamed of us either. I wish… I wish there was some way- That we could-" Her voice broke.

"Clary," He breathed, pulling her chin up to gaze into her deep green eyes." Do you know the thing I am most jealous of?"

She shook her head, not sure if she wanted to know, but still clinging to every word.

His golden eyes seemed to flash a shade darker as he stated, "I am excruciatingly jealous that you let him."

Her breathing hitched in her chest as she struggled to find the perfect words. Not being able to find any, she simply said "Jace, I'm sorry."

The words set something inside of him off. "No, you aren't, Clary." He hissed scornfully. "You keep apologizing, but you never change. Don't apologize if you don't mean it." He spun on his heels and started to stride away, muttering to himself.

Clary froze, then called plaintively after him. "Jace, wait!"

Jace turned and planted himself in a distinctly unfriendly posture.

"I think I could- I mean- Don't you think we could- Umm-" She stumbled over her words. "Oh, hell. I'm not charming, or good with words like you are Jace. What I mean is-"

She stretched up and pressed her lips against his. She tried to convey all her regret, her longing, her love into that one kiss. Her arms wrapped around him, and his made their way hesitantly around her, pressing their bodies tightly together. Recovering his cocky attitude, he hitched her legs around his waist and pressed her to the wall, lifting her higher so her could attack her elegant neck, kissing and nibbling.

She moaned and tried to form coherent sentences as he continued his assault. Her hands clenched in his hair. "Jace… I think I'd be willing… to try… umm… hiding from everyone. Our relationship, I mean… If you still want to… Ah!"

He paused, glancing up into her eyes. "Are you positive, Clary? I don't want to force-"

"Jace. I'm sure. I wouldn't have said anything if I wasn't." The words tumbled out in a rush of breath as her feet slid to hit the floor. "That's what I was trying to tell you before. At Taki's." She clarified. "But you interrupted me, and I couldn't bear to contradict you when you just decided to be siblings, even though it was the opposite of what I wanted. I wanted you to be happy."

"I've already told you, Clary. You feel like home to me, and that's the only place I've ever been happy. Where I will ever be happy."

"Of course I feel like home to you," Clary grinned mockingly, lightening the mood abruptly. "We are brother and sister, after all."

They lapsed into a comfortable silence; their paces matched perfectly as they walked down the hall.

Clary cleared her throat. "Umm, so what did that girl deliver, anyway?"

"Well, your birthday is only a couple days away. What kind of brother would I be if I didn't buy you a present?" He teased, eyes sparkling.

"You didn't have to, Jace."

"But I wanted to."

"Oh." Clary muttered under her breath. "Incest never looked so good!"

"What was that? I couldn't hear you." Jace smirked mischievously.

"Oh, nothing."

The only sound as they walked down the hall were Jace's quite chuckles, carefree at last.

Ok, so this is it! My first fanfic! Please review, I will be eternaly grateful and love you forever if you do! Unless you flame me, in which case... Umm, you'll just be in big trouble. Let's leave it at that.

Once again, I'm sorry if the characters were OOC. Sugestions are welcome.