Summary: Movie Verse: What if Alec had been keeping a secret from them all ever since they had first met Clary and Simon.

One-Shot

Clary grunted as she was shoved against the wall by Alec has he held her there by her throat with a deadly look flashing in his deadly ice blue eyes as he glared down to her.

"You ever say something like that again! And I will kill you." Alec snarled down to her as he held her there as her wide emerald green eyes stared up at him with fear and other emotions. He stopped though as her scent hit him with it effecting him on a primal level. He knew what she was to him the minute they had locked eyes with one another in the club. His blood had been boiling with different emotions ever since she had collapsed to the ground right inside of the doorway with the poisoned bite wound on her arm sweaty, paling and almost dying from it.

"Alec?" Clary spoke as she saw the conflicting emotions in his eyes. Though she only said what she had said not to hurt him but to distant herself from him. Something inside of her burned with need to be with the male holding against the wall and keeping her there. It was if her instincts were telling her to bow to the male before her; bare her neck and submit to the male holding her against the wall.

Alec snapped his eyes gaze to her own and stared at the female and fought the urge to growl as he saw the mixed emotions within her eyes. He felt somewhat relieved that she felt the same instincts and emotions that he felt. He was tired of fighting the urge to claim what belonged to him and the only reason why he fought the urge was he could see Jace fancied the female. Narrowing his eyes as they darkened to almost black tone color though he nearly growled as her scent spiked with desired and need. Releasing a foul curse in another language he crushed his mouth onto her own swallowing her gasp and her whimper from his kiss.

It was like fire had ignited within her as she moved grabbing his hair and yanking him closer to her body. She kissed the male back hard and held him to her as she felt as if her instincts had taken over her entire body. She gasped as she was picked up by the male and slammed into the wall further as her legs moved to wrap around his body. Tossing her head back as she gasped for air though she moaned softly as the male latched on her neck peppering it with kisses, bites and licks causing her to shudder in his arms.

Alec growled in approval as she reacted to his touches. Though he knew he should stop right here and now before it went further but he couldn't. She was meant to and supposed to be his; he could smell it and sense it from her. Though the others would not understand fully cause he was the only one to really listen to his parents' teaching on this type of stuff. Smelling her arousal he groaned low in his throat as she bucked her hips against where he had her pinned. Moving he bit into her shoulder hard enough to leave a mark but not hard enough to break the skin and enjoyed her shocked gasp of pain and pleasure. Pulling back some he fought with claiming her right here and now against the wall.

"Do you want this? You need to tell me now before I cannot pull away from you Clarissa." He growled low to her as he locked his dark smoldering eyes with her own as it seemed as if she was fighting a battle before coming to a decision.

"I don't know what this is...but I feel pulled to you. Like I never want to be apart from you, like I want to be with you forever and always and never have another." She whispered with fear in her eyes as he smiled leaning closer to her face.

"There's a certain thing Clarissa; the others never really listened to the teachings in the area but I did. Every Shadowhunter has a destined out there they are meant to protect and love. You are my destined; I have known since I had locked eyes with you in the Club. Be mine and I will protect you, care for you, provide for you and love for you forever." He whispered huskily against her mouth as her eyes widened in shock at his words. God; he wanted to claim her and let the wold know she was his and only fucking his.

Clary looked up at the male with shocked eyes and that is when it hit her. She was always looking out for others and seeing to their safety before her own. Take what happened a few hours ago when she had forced the others to help her save Simon cause she felt the need to protect the male as he was like her younger brother. Looking up into the male's eyes; she knew if she accepted then she would become his; his to protect, care for, love and provide for her and all she had to do in return was love him back and be loyal to him. Making her decision she leaned upward and kissed the male on the mouth lightly.

"Claim me." She breathed out against his lips and watched as his eyes darkened with primal need before he covered her mouth his in heated kiss their hands roaming one anothers bodies. Small whimpers and moans escaped her at the things he was doing to her body.

Before either knew it they were inside of Alec's room with him gripping her roughly before he threw her onto his bed with a low growl rumbling from him. Moving he slammed his door shut and locked with him placing a rune on the door to keep everyone out and to keep anyone from hearing with what he was going to do to his mate. Turning slowly as he peeled off his black tight shirt he watched her hungrily as she laid on his bed with a dusty rose blush tainting her cheeks. Smirking some; he stalked towards her with the steps of a predator an watched as a shiver went through her entire body as he came to a stop at the edge of his bed.

"Remove your clothing, Clarissa." Alec ordered huskily as Clary blushed even more but the hunter in him the predator in him was down right pleased as she obeyed her soon to be mate. Yes he could be sweet and kind but in truth what no one really cares to see is that he was a very dominant male and to see Clary who barely knew of their world placing her trust in him to obey his orders sent warmth racing through his entire body and made his heart yearn for her even more.

Clary moved slowly setting up as she peeled away her jacket tossing it to the floor before slowly removing her red shirt and tossing that aside as well. Her face felt red hot as she blushed brightly as she leaned back slowly moving her hands down her flat stomach over her hips to unbutton her jeans as she had already rid herself of her boots and socks. Though; her breath hitched in her throat as she looked upward at the male before her through her eyelashes and saw his dark smoldering blue eyes with now boarding on black at her actions. She watched as he nodded his head for her to continue an she did so with a small nibble on her bottom lip.

He watched with desire coursing through him thick and raw as she slowly undid her pants before slowly shimming out of them till they piled on the floor as well with her other clothing living her clad in dark crimson lacy underwear and bra set. He let his eyes rove down her body examining all her dips and curves with dark eyes as he looked at her closely, "Take off the rest." He ordered with a soft rumble as she hesitated before nodding her head slowly.

Clary sucked in a deep breath to gain courage but gained it as she saw he was starting to remove the rest of his own clothing. She unclasped her bra shucking it aside before riding herself off her panties. She laid there as she fought the urge to cover herself and hide away as she watched as he removed all of his clothing and stood before her completely naked causing her to turn her head to the side with her eyes closed in embarrassment. Though she blushed even more as she felt him kneel on the bed before leaning over as he placed his mouth near her ear

"Don't ever look away from me. I am yours just as you are mine Clarissa." she shivered as he breath tickled her ear before he moved down her body cause her to become confused as he parted her legs slowly before disappearing all together. Just as she was going to open her eyes and look for him; a warm tongue and hot mouth attacked her center causing her to jerk her body upward some and gasp in pleasure.

Her head tossed back as moans and whimpers were tearing from her mouth. Her hands gripped the silk bedspread beneath her as she moaned deep in her throat as she felt his tongue enter her body his mouth nipped at her bud softly yet hard enough to leave a small sting behind. She felt her entire body shudder as he did things to her no one else has ever done to her before.

Alec grinned full of pride as she came into his mouth with his name slipping from her sweet mouth like a delicious prayer for more of what only he could give to her. Pulling upward as he looked at her face and smirked as she laid there panting with her eyes closed in bliss at what he had done to her. Firming his resolve to fully claim her as he crawled up her body and moved to where her thighs were cradling him close to her body as she slowly opened her eyes to lock with his own.

"If we go through with this you are mine, Clarissa." He warned as he was truly giving her out even though everything inside of himself was telling him to claim the female forever as his own. He watched as she leaned upward looking into his eyes touching his cheek gently.

"Like I said earlier Alec; I don't know what I feel for you exactly though I do know it is strong and very powerful. For once I want to let someone else take control, let someone else who will not lie to me or make me feel inferior. I trust you Alec and I trust we will be able to become strong and close with one another. Must be my new found Shadowhunter instincts." She smiled to the male covering her body with his and moved her legs to where he was now more settled between her and gasped as his hard brushed against her wet core.

Alec groaned as he rubbed against her; burying his face into her neck as he moved slowly and entered her groaning even further at how tight she felt around him. He moved even more slowly as he heard her pained whimper in his ear causing him to wince at causing her such pain but it would past and then she would feel nothing but pleasure from him and only him. Though some part of him that was purely male; felt pride no one else has ever had her before him or even touched her.

After a minute; Clary moved her hands across the male's back and him to her as she moved wrapping her legs around him tightly before placing her mouth next to his ear, "Move Alec please." She moaned softly to him causing him to growl as he pulled up looking into her eyes with a sharp look before desire over took his face as he saw she was serious.

Shifting to where he pulled back before thrusting back hard into her tight wet center. He gripped her hips as he leaned to where his was on his knees and pulled her hips upward angling her to where he could thrust further and harder within her. Growling he took her hard and fast as moans and small cries slipped from her mouth. As her eyes were impossibly dark and never left his own as she tried with all her might to keep up with his thrusts.

Though as they took one another neither one noticed as the place right above their hearts began to glow and burn as instincts over took them both. Clary had at some point moved to where she was now riding the male hard and fast as he gripped her hips in big calloused hands helping with rocking back and forth on the male as he thrust upward deeply into her.

A loud cry tore from Clary's mouth as she tossed her head back as she released for the final time that night and moaned as the male beneath her cried out his own releasing thrusting harder up into her. She collapsed down on the male sweaty and panty with small shallow breaths. She smiled though he held her tightly to himself nuzzling the top of her head.

Next Day

Clay shifted nervously as she looked to Alec. His parents were back from visiting Idris; an he wanted to show them his new mate. Though she smiled though as she glanced down to the top of her left breast and saw the rune for Alec's name right there above her heart. Before glancing behind her to her mate and smiled to him as she spotted the rune for her name above his own heart as well as he slipped on a shirt and blushed as he smiled wide at her.

"Ready for this?" Alec asked with a soft look as held out his hand for her take and felt pleasure as she took it without hesitating and let him lead her from the room and towards the main room.

"There you two are." Isabelle spoke with a nod of her head though she stopped as she saw the way her brother was holding Clary close to his side. Though she paled some as she saw the Rune for Alec's on Clary from her cleavage was showing from her black leather corset pushing up her chest, "By the Angels! You two..." She trialed off with a shocked look upon her face.

"What?" Jace frowned as Simon was frowning as well with concern. He watched as Alec move and placed one of his feet in front of Clary half way hiding her behind him as if was protecting her from them all.

"My son?" Maryse spoke with a calm tone as she looked at her son with hope flashing in her eyes. She knew mates were rare to find now...her and her husband were lucky to have found one another. She really didn't care if the female behind him was Valentine's daughter or not. She was better then a Downworlder in her opinion. And with this she knew their line was secured plus from what Hodge had told them she could place objects into mirrors and paper with including in making new Runes.

"She is." Nodded Alec as his hand hovered near his sword as he would protect her with everything inside of himself. She was his and no one was going to take her from him and he meant no one.

"What the hell is going on?" Simon demanded with a confused look to them all as he tried to go closer only to be yanked back by Isabelle as Alec's eyes darkened and he pulled free a dagger ready to fight.

"Alec and Clary are mates." Robert spoke as he crossed his arms over his chest and watched on how his son was reacting. He was reacting a lot like he had reacted when he had found his mate their mother. Plus he had seen how a couple other males had reacted in protecting their newly found mate.

"Meaning Clarissa is mine and no one will ever take her from me." Alec spoke with an icy tone as he kept a hand on Clarissa behind him and kept his dagger up in front of him with a cold look.

"Her name is Clary. She doesn't like to be called Clarissa." Snapped Simon making Isabelle sigh with annoyance at him

"I don't mind if he calls me Clarissa." Clary piped up kind of annoyed everyone was talking about her as if she was not here, "Their telling the truth. Simon, it...it feels as if a weight has been lift from my chest. All my life I have spent it worrying about everything else...these past couple of days have been hell to where I have been in nothing but constant turmoil. Being with Alec has cleared that up its like I don't have to worry about anything like he has my back and will always been there every time I turn around he will be there with being the back bone. Not much has changed...except he's my everything now and my first priority. I feel as if I can breath now and that everything is going to be okay." She explained with a nod of her head to the male as he looked pained at her words.

"But...what about your mother?" Demanded Simon with a frown as he felt as if his heart was breaking at her words.

"I will find her and I will find Valentine. And once I do; my mother will be safe and Valentine will die for doing this but I wont do this alone...I'll have Alec there with me. Where I go, he goes and where he goes, I will always follow him." Clary spoke softly and smiled as Alec moved wrapping his arms around her tightly.

"Your mine always and forever Clarissa." Alec whispered in her ear as he held her tightly before his eyes landed on Jace and saw his dark look. He knew it would be a long time before they were back to being brothers again. Even though it hurt he would not give up his mate for anyone or anything ever.