"Our Little Secret"

A Mortal Instruments story

All characters and environment were created by and are property of Cassandra Clare. Some plot lines are taken from or expanded upon storyline from "City of Ashes" in The Mortal Instruments series.

Summary: Takes place as an alternate or addition after the Seelie Court in "City of Ashes", when Jace and Clary end up back at the Institute in Jace's room.

This is my first attempt at a fanfic, so please be nice and leave me reviews!

***Warning: rated M for adult content. ***

"I am in serious need of a hot shower after that pond scum we just waded through", Jace announced. "I've been in some filthy situations, but I must say not much compares to smelling like a slug. I don't know what Isabelle sees in the fairy folk that would drive her to endure that more than once. Even for a booty call."

Clary shrugged, "So I guess you're saying I smell equally as repulsive at the moment." Jace smiled, answering her question with an appraising glance of her sopping wet clothes. "I'll take a shower when you get finished. I just want to reach Simon first. He's not answering his cell, and well you saw what happened; I'm worried." Clary regretted saying anything the moment the words had come out. Then braced for the critical sarcasm that was sure to follow.

"Worried about what exactly?" Jace began defiantly, "That your farce of a relationship might be on the rocks. That somewhere lost in the night a pathetic mundane might have finally had enough of pining over you and decided to do the unthinkable and turn off his cell phone."

Clary winced

"Well you didn't exactly help the situation you know. Why did you have to kiss me like that?"

"I wasn't aware there was another way that you like it," Jace said with tremendous satisfaction. "Obviously the lame make out sessions you've been having with rat boy weren't doing it for you, so someone had to do something to get us the hell out of there. I can't help it if I'm irresistible. It's really a shame, the mundane never had a chance."

It was moments like this that made Clary question what it was about Jace that she was so drawn to. Wanting desperately to deny everything he had said; she was instead left with the notion that although he may be a pompous ass, he was unfortunately also right. Instead she settled for a "get lost already" but threw in "you pompous ass" for good measure.

As Jace disappeared into the bathroom, Clary turned her attention to the cell phone now in her hands; its display reading zero missed calls. She tried calling one last time, noting it went straight to voice mail. Meaning that Jace had been right; Simon's phone was turned off.

Somewhere in the distance she heard water in the shower begin to run, before it was abruptly quiet again. Shortly after a shirtless Jace emerged from the bathroom and stood in the doorway. Steam surrounded him, glistening off his golden hair and creating beads of sweat that ran down his bare skin. Taken aback by the sight of him, she knew her face was flush, but couldn't manage to pull her eyes away to hide it.

Jace leaned confidently against the doorway. Allowing her time to take in the cut of his well defined chest and abs, trailing down to his low rise jeans. Clary was suddenly struck by the image of the lion that Jace had reminded her of when she first saw him in Pandemonium. Here as he stood inches away, his predatory eyes were fixated on her warming her all over, making her willingly want to become his prey.

It wasn't hard to tell that Jace enjoyed the effect he could have on Clary, even if some part of him also felt how wrong it was. Knowing that Clary wasn't alone in her feelings. He had been trying desperately not to be attracted to Clary since the moment they had discovered they were siblings. The one thing that had kept his emotions at bay was the thought that Clary may no longer feel the same about him now that she knows the truth. It had been enough to make him fight the wrongful urge to reach out to her.

But all of that had changed tonight. The Seelie court had discredited his doubtful fears and awakened new ones at the same time. Clary did want him, that was evident by the reaction he received when he had kissed her; and apparent now as she stared at him with flush face and desire in her eyes. It lit a fire in him, and he could no longer compel himself to tame it now that he knew she was feeling it too.

Glancing down at Clary sitting on the bed, Jace motioned back toward the bathroom and gave a sly smile. "You know I checked and there's not enough hot water for two showers. Isabelle probably used most of it by now. The only way we're both getting one is if we share." Clary straightened, "Seriously! you're not suggesting that I take a shower with my brother? I mean it might have been ok as toddlers, but we're grown adults now Jace," she tried to hide the embarrassment she felt at the thought. "Exactly," Jace went on, "we're grown adults, we can keep clothes on if you want. The point is just to get clean right? Or would you rather smell like a slug all night?"

The thought of smelling bad and being stuck in uncomfortable clothes however unappealing, wasn't at all scary. However showering with Jace, clothes or not, was terrifying! So why couldn't she bring herself to be reasonable and say no? You're crazy! Instead her brain struggled to protest but her mouth listened to her heart and responded with a simple shrug, "ok."

Jace didn't flash his usual cocky grin when he heard her response. Instead the fire he was fighting internally received a healthy dose of kerosene. Their eyes didn't move from one another as they each contemplated the implications of this decision.

After a long moment Jace retreated to the bathroom leaving Clary to follow through or not. Jace got the water running again and turned back to the doorway leading to his bedroom. He was almost surprised to see Clary standing there. The sight of her intensified the heat of the already steam filled room. Not saying a word Jace turned, slipped off his jeans leaving only boxers in their place and climbed into the shower.

Clary feeling a little self-conscious even with the low visibility the steam had created, shook her wet jeans off and lugged her heavy shirt over her head. Thankfully she had worn a white camisole tank under her shirt in place of a bra. Leaving her with only it and a pair of simple white underwear to cover her body.

Convincing herself that Jace didn't seem to think it was a big deal, she climbed slowly into the shower.

"Well that was easy enough, you really should learn how to play hard to get Clary", Jace grinned.

She immediately regretted her decision.

Clary went on the defense, "What, was this just some kind of test of your abilities to woo women into the shower with you, in an attempt to boost your already enlarged ego."

"I'm quite confident in my abilities with women, thank you very much. However, watching you shower in your underwear may enlarge more than just my ego."

Clary wanted to go crawl under a rock. Then she stole a glance at the full sight of Jace as water ran down his body. She knew she was blushing again, and was jealous that Jace never seemed to blush with embarrassment. He could say the most inappropriate things and never seem the slightest bit ashamed. On the contrary, he was able to pull it off with a flirtatious smile that made Clary unable to hold him accountable for anything.

Jace knew he had made her uncomfortable. Feeling bad he immediately changed his tone to that of the sensitive caring man that he reserved for moments like this. He could be a completely different person when he let his guard down. It may have been the cocky self-assured Jace that had reeled Clary in initially, but the compassionate man that only revealed himself to her in private was what had cemented her love for him.

Jace motioned with his hand for Clary to join him, "Here, come stand under the water and I'll wash your hair."

That was all it took to melt away any agitation she had felt towards Jace only moments ago. The look in his eyes was now caring and sympathetic with a sense of underlying guilt. She knew the same sense of pained guilt was mirrored in her own eyes, because being this close to Jace truly was painful. She followed his lead and moved in closer, wanting desperately to feel the warmth of his body. Turning around with her back to him she let the warm water cascade over her shoulders heating her whole body. All the while feeling the even stronger heat emanating from Jace's body only inches away behind her.

She felt Jace's hands brush lightly through her hair beckoning her to lean her head back. His touch was gentle, caressing her soft curls before gathering her hair into his hands completely. He lifted her hair away from her neck and let the back of his hand linger against the skin of her neck for a brief moment. His touch was like fire, all consuming her senses and lingering long after his hand had moved on. She heard him reach for something, then the shower was filled with the sweet smell of milk and honey as he lathered shampoo into her hair. He then rinsed it letting his fingers trail along her neckline sending shivers all over her body. The sensation was intoxicating, like a drug. She suddenly found it hard to hold herself upright.

When he was finished she pulled away and turned to face him leaning against the back of the shower to steady herself, noticeably affected by his touch. He matched her glance with an equal look of wonder. Had that felt as intense to him as it did to her?

Stepping under the flow of water Jace closed his eyes and leaned his head back letting the water wash over him completely. Clary watched, still held speechless from their brief encounter. Her gaze wondered down his body taking this opportunity to admire him. His skin was slightly flush from the heat of the water which pooled into ravines down his skin, following the faint lines of rune patterns that remained.

Her head was foggy with lust and heat, wanting desperately to feel his touch again. Before she consciously realized it she was touching him, running her fingers along a stream of water as it trailed down his chest and along his stomach. His muscles tightened at her touch pulling her from her trance to find that he was now staring at her with an intense look on his face.

Feeling like she had been caught doing something supremely embarrassing. Clary pulled her hand back, offering no explanation. There was no explanation needed, the reasons were written all over her flush face. This time however, the flush stemmed more from lust and less from embarrassment. It had overtaken her rationale. Jace took notice, planning to take full advantage of Clary's momentary lapse of conventionalism.

He reached out and pulled her hand back to him returning it to his waistline. Then he took an appraising look at the lines of her now wet body, leaving little to the imagination. She could feel his eyes on her as they traveled down her body before returning the reflection in synch with her own.

He reached out with one hand and brushed a few wet strands of hair that had matted to her face, tucking them behind her ear before tracing along her jaw line with his fingers. Clary closed her eyes at the sensation of his touch on her skin and steadied herself against the back wall of the shower.

Jace would not relent.

He moved down to her neck sweeping his whole hand along her collar bone and upper chest, stopping just shy of her camisole; only his thumb breached the upper seam. Following it over to her arm, he slowly pulled the thin strap down off her shoulder. He held his hand there playing with the strap between his thumb and index finger. Drawing goose bumps and deep breath.

She felt the heat of him moving closer as her eyes fluttered open. She caught sight of him, just before she felt the touch of his lips against her skin on her shoulder where the strap had been. Reality set in as to what this was leading to. She tried to get his attention by calling his name in protest, but it came out as a moaned cry for more.

It did call his attention to her lips though, as he worked his way up her throat kissing and sucking the water off her skin along the way. Clary felt the need to stop him before this went too far, but was finding it hard to remember why she would ever want to stop feeling a sensation like this one. "Jace, this is wrong!", Clary managed to blurt out between gasped breaths, but no strength could be found to pull away. Continuing to plant kisses along her neck he stopped only momentarily to address her, "If we both feel the same way Clary, I don't see how it can be wrong." Regaining some composure Clary argued her case filled with sadness at this torture. "It may not be to us, but to everyone else. I could never face them and tell the truth, they wouldn't understand."

Jace leaned in until she could feel his warm breath on her ear as he whispered softly, "we can keep it a secret." Then he continued kissing his way back down her neck not giving her a chance to protest further. "I want you Clary", his voice sounding strained. Upon hearing his plea, she instinctively wrapped her arms around his neck landing her hands in his wet curls before pulling him closer. "I want you too," Clary whispered defeated.

He took this as a sign that she was done saying no. Every fiber of his being knew that Clary was all that he wanted. He pulled away and looked deeply into her eyes, looking for any doubt that might still remain. What he found instead was reassurance. Clary's eyes were filled with lust, her chest heaving with anticipation of his kiss.

He leaned in and softly brushed her lips with his own. She pulled him to her with lips parted as an invitation for more. They both melted into one another no longer holding anything back. As their tongues explored each other's mouths, their hands explored each other's bodies. Pressed together forming one synchronized unit. Jace moved his lips from her mouth down to her throat as she leaned her head back to give him better access. He ran his lips down to the upper edge of her breasts as his hands inched their way up her sides and stomach under her tank top tickling Clary's sides along the way.

Lifting up, he slid her wet camisole up her body and over her head. Seizing the opportunity to slide his hands down her front side and over her breasts on the way back down. This elicited a light moan from Clary and sent them both over the edge.

He continued the path with his hands, but now with a clumsy impatience. Moving them down her body reaching behind her, and in one swift motion lifted her up into him. She flung her legs around his waist straddling him, as he pushed her body up against the wall of the shower. Her bare breasts pressed hard against him as they fell into another fevered kiss. Clary could feel his erection now pulsing under her as he began to thrust his hips against her. All that separated them now was the thin material of their underwear. The friction from each thrust of his hips sent waves of euphoria through her body, making her moan and call out to him in appreciation.

Jace held her pinned between him and the shower as he kissed her, working his way down her body stopping at her breasts. She arched her back pushing them into his mouth, demanding he continue his treatment there as well. Jace gladly obliged, lightly sucking and licking her nipples as she bucked and moaned from the stimulation.

They were both worked up into such a frenzy that neither of them even noticed when the hot water in the shower ran out. It was now spewing ice cold water onto them. The cold only seemed to accentuate the heat emanating from his body, intensifying the sensation of his hot mouth on her skin.

Jace however, noticed soon that Clary was shivering and set her down to move away and shut the water off. Then he grabbed a towel he had set out by the shower and wrapped it around her in an attempt to warm her. "Come back to me Jace, I need you to keep me warm." Clary protested with pouting expression.

"I know", Jace chuckled. " I gladly will in just a minute. I need to get you out of this cold shower first though, you're shivering."

"I'm fine." Clary made an attempt to dry herself and then wrapped the towel around her, tucking it under her arm to keep it in place. "Talk about a mood killer! Why do you have to be so worried about my safety all the time?"

Jace leaned into her, flashing an angel's grin, "I promise I'll make it up to you if you'll just humor me."

"You better!" Clary began as Jace planted a soft kiss on her lips stopping her rebuttal.

While they kissed he rode his hands up each side of her legs pulling the towel up as he went. Then slowly pulled her wet underwear down, letting them land at her feet. She blushed once she realized what he was doing. Then he pulled another towel from the stack beside the shower entrance and dried himself off. Wrapping it around his waist and then pulling his boxers off in the same manner, he discarded them to the side.

"Hey no fair, why didn't I get to do that part?" Clary giggled. "Alright, calm down pervert. " Jace kidded as he scooped her up with both arms and carried her out of the shower.

"I have legs you know, I can walk", Clary gestured.

"Believe me I know. I wouldn't dream of questioning your ability to do anything. I just thought it would be more chivalrous of me to carry you to bed, considering I plan on corrupting your virtue."

"Oh well in that case, carry on!" Clary said laughing as she threw her arms around his neck giving in to the gesture.

They both fell on the bed at the same time. Jace had inadvertently discovered Clary's ticklishness, and couldn't help himself from exploiting his advantage now. She squealed and squirmed to break free.

They were so focused on one another they hadn't even noticed that Isabelle had burst through the door and was now staring lock jawed at the scene before her. Once they did take notice, Jace stayed put looking annoyed. While Clary took a dive under the covers in embarrassment. "Don't you know how to knock Iz?", Jace complained.

"I don't even want to know what's going on in here. Sorry to interupt but the buzzer to the institute is going off. This late at night I figured it might be something serious. If you care to take a break from your rendezvous I could use your help."

Jace looked flustered, "Sure thing, we'll just uh...get dressed then meet you in a sec."

Isabelle shut the door with a roll of her eyes, leaving Jace and Clary to get dressed. Jace crashed on the bed as soon as she was gone breathing a sigh of relief. If anyone was going to walk in on that situation Isabelle was the best option for the least amount of judgmental criticism. She had always been supportive of their situation. He knew that she would respect them enough to not go blabbing about what she had just seen.

Clary finally pulled the covers down to reveal her worried expression. She didn't know Isabelle as well as Jace and had her concerns about this staying strictly between the three of them. Jace tried his best to assure her. "It'll be ok, Clary I promise."

"I know, I'm just not sure I'm ready to face reality yet."

"Well it looks like we have to for now." Jace sat up reaching for a shirt on the dresser. Then he stopped to give Clary a quick peck on the lips. "We'll finish this later I hope? For now I'll find you something to wear. We better go see what's going on. Isabelle's right, there must be trouble for someone to be buzzing the institute this late at night."

Jace found Clary a blue long sleeve shirt that swallowed her whole, along with some sweat pants. Clary ran a quick brush through her still damp hair, as Jace grabbed a seraph blade from the dresser before heading into the hallway. The Institute was quiet. Isabelle must have gone on downstairs to check it out. Then they heard the buzzer going off insistently, causing each of them to jump.

They rushed down to the elevator at the end of the hall knowing now that something was definitely wrong. The ride down to the first floor was tense with the anticipation. Danger mixed with the awkwardness felt at their personal situation. Once they reached the bottom they could hear Isabelle screaming for them to hurry.

Clary saw Isabelle lying on the ground hovering over a still body that was covered in blood. As they approached, she couldn't make out who it was. With so much blood it was hard to tell anything. Suddenly Clary had a tremendous feeling of dread shoot through her. At the same time Jace reached out for her in anticipation of what was to come. He knew who was lying there and it would only be seconds before Clary would figure it out. Jace reached her just in time, as recognition dawned in her eyes. Seemingly lifeless only a few feet away, Clary saw a boy wearing a gamer t-shirt with blood smeared on it.

"Simon!" Clary screamed, pushing Jace out of the way to run to her friend's side. Lifting his head up, cradling it into her lap she began to cry as she saw that Simon wasn't breathing. There was dried blood all over him and some fresh blood emanating from several marks on his neck.

"What the hell happened?" Isabelle blurted out. Clary was unable to even formulate words. From out of the shadows a pale figure appeared, they all three recognized the vampire Raphael.

"I brought him here because I know that he is a friend of yours. I was unable to stop what happened to him, he brought that upon himself. The least I can do is to give you a choice though."

Clary snapped from her trance to address him. "A choice, what kind of choice? Are you saying that he's not …dead." Clary could barely utter the words.

"It may be too late to save him from death, but I promise you I took no part in that. My coven was unable to control themselves when the mundane wondered into our lair. However, there is one option for him still. Though it is not equivalent to life it is also not equivalent to death."

Jace approached Raphael with caution. "What are you talking about bloodsucker? Make your point or I'll assume that you are the one responsible for this. After all, you are the coven's leader are you not?"

"That's why I'm here. I do not wish to make enemies with the Clave for the mistakes of my brood. Young Simon was drawn to our coven because trace amounts of my blood reside in his veins. That night at the Hotel while he was still a rodent, he bit my finger in an attempt to save all of you. This alone would have done him no harm given time, but his curiosity for my kind brought him into the house of a coven of vampires unprotected. Despite this offense, I am willing to allow the change in him if that's what you wish."

"Make him one of you! That's supposed to be some sort of option worth choosing?" Jace looked at the vampire with disdain in his eyes.

Tempers were flared and the tension in the room was thick. Clary drew the attention of everyone as she stood and commanded with a stern voice, "Do it!"

Jace tried to reason with her. "Clary you don't know what you're saying. I have seen a newborn vampire when they are overtaken with thirst. It's not something I would wish upon anyone."

"You just don't want to help him! Do you?" Clary looked at Jace accusingly, cutting him with every word. "This is my fault! I can't just sit by and do nothing Jace."

"Your fault?" Jace made a move towards Clary. "How in the hell do you think this is your fault?"

"Oh I'm sorry you're right, it's our fault. Mine and yours, and you know why. Why was Simon even at the Hotel tonight in the first place? He was upset because of us Jace. I just can't live with the idea that I may have caused this."

Trying to remain calm Jace approached her earnestly and reached out for her hand. "Please don't push me away. This is not our fault Clary. I don't care what you say. This is your decision to make though and I will do whatever you want."

"I want for none of this to have happened at all!" Clary screamed through tear filled eyes.

Jace could feel her pulling away and knew what it meant. "I understand," he said fighting back his frustration as he dropped Clary's hand. Then turning to Raphael asked, "What do we have do?"

Like I said this is my first fanfic, I would love some feedback on how I did so please leave reviews.