Cynthia giggled as she stood at the bedroom window the morning after, hands creeping around her waist with a kiss pressed to her cheek. She sighed lightly and asked the demon boy "Where do you think we'll be in like five years time?"

"Well, we'll be king and queen together, obviously."

"You seem so sure."

"I'm always right."

Cynthia arched a brow at that, turning around in his arms and placing a hand flat upon his chest, pushing him backwards until he was forced to fall back onto the bed. Jonathan let his arms fall by his sides as she straddled his hips. He raised a hand and flicked a stray lock of hair from the girls eyes, cocking his head a little "Why me? You could have that angel boy, but instead you chose me."

Cynthia didn't even know the answer to that question herself. Instead of answering, she just leaned down and captured his lips to her own, letting her hands trail up his chest, popping open buttons as she went.

"Mmmn, shut up" she breathed out, opening the last button and letting his shirt fall open, running a hand up his toned pale stomach. In her minds eye, she could remember him when he'd been so young. The spell that had made her forget their primary visit had faded over time and Cynthia giggled to herself at the memory of the little boy with the fluffy white hair.

"Something funny?" Jonathan asked at the sound of her giggle, his hands trailing up the outside of her thighs.

Cynthia smiled against his lips as her own touched them "It doesn't matter."

They kissed passionately for a few minuets, Jonathan flipping them over before Cynthia asked "Where is Father anyway? He never came home last night."

"He had stuff to take care off."

"What sort?"

"Oh, retrieving the Mortal Cup, blah blah blah."

"What?" Cynthia flipped them back over, a frown upon her face "He found it? Where was it?"

"My little sister had it." Jonathan shrugged, laying his head back "I want to meet her. Can you imagine? I have a blood sister." There was a dark glint in his eyes and Cynthia heard him mutter out "I wonder how much like me she is."

"Well I've met her." Cynthia told him, pressing a kiss to his cheek "She looks nothing like you. Actually, more like your mother."

"I have no mother."

"Oh hush Jonathan. Not my fault your father couldn't keep it in his pants."

Jonathan snorted at that, raising a hand to cup her cheek "Is she anything like me?"

"Well, I think she's banging Jace."

The demon boys eyes narrowed at that "I may be sick. But, oh-" his eyes were slits "you are jealous, aren't you? I know you loved that angel boy. No… how much you do love him."

Cynthia rolled her eyes and climbed off him, straightening up as she sighed out "I'm not having this conversation, Jonathan. I told Jace I had a boyfriend, actually. And that even though we fought like cat and dog, I loved him." She turned to leave but he was up in a flash, catching her wrist "Did you really say that?"

She nodded, yanking her wrist away "I did. Now leave me alone." Cynthia had a headache. As she walked down the hallway, she gasped, clenching her eyes shut and fell against the wall. Cynthia coughed as her chest suddenly started to burn, gasping out as she slid down the wall, panting heavily "J-Jonathan-?"

Her head was on fire.

Suddenly, something was pressed against her lips and she heard a voice saying "Shhh. Come on, drink you silly cow." Cynthia groaned and grabbed hold of whatever was pressed to her lips, feeling the blood fill her mouth, way more relieving than it should have been. A hand was smoothing back her hair as she drank, eventually letting it go when she'd had enough. It was as she opened her eyes that she realized just what he'd done.

Jonathan was sat with his back to the wall, herself sat before him… and his left wrist was bleeding. Cynthia suddenly felt sick and she scrambled to her feet, almost losing her balance "What the fuck did you just do-?!"

He cocked a brow at that, raising his stele and drawing an iratze to heal himself, the bleeding stopping slowly. "You needed demon blood, so I gave it to you."

"Not by cutting your damn wrist open!"

"You should be grateful. I saved your life. You wouldn't have gotten demon blood any other way, you know? I don't keep cups of it next to my bed. Don't you feel better now?"

Cynthia raised a hand and massaged her temple, eyes fixed upon the demon boy. He didn't seem particularly smug or amused that she was disgusted by having to drink his blood to live. He didn't seem bothered at all. She sighed and let her eyes close-

Great. She was tied to him now.

"Yes." She said grudgingly "I feel much better." A frown creased her features "It's never hit me like that before. So… violently."

"And what would you have done if I wasn't here, hmm Cyn?" he asked now and Cynthia sighed. "I don't know."

"Exactly. I'm going to have to keep you close, aren't I, hmm?"

"Oh how exciting. Can't you tell I'm overjoyed?"

"Positively ecstatic."

-LightInYourNightmare-

Later that night, Valentine returned and Cynthia paused to look up from the drawing she was doing- Jonathan had fallen asleep upon the sofa and she'd taken the opportunity to draw him.

He was a perfect specimen to sketch with his handsome features and white blonde hair in his closed eyes. The more Cynthia stared at him, the more beautiful she found him.

Valentine had something in his hands, something that sparkled. Cynthia dropped her sketchpad in surprise as he tossed it to her, watching her catch it neatly.

The girl turned it over in her hands, dark eyes widening as she realized just what she was holding. "Is this-?" she asked, looking up to her adopted father. He nodded, walking over to Jonathan and placing a hand upon his shoulder, shaking him only once to rouse the boy.

Cynthia scowled as he plucked the Cup from her hands, turning it over in his own appreciatively. "Looks like a glorified and gilded over cup of Cynthia's" he snorted out, holding it out for his father to take. Valentine snagged it back and placed it upon the table, seating himself upon the sofa next to his son and sitting back, letting his eyes close.

"You cannot see Jace again, Cynthia."

"Wh-? Why?" she asked in confusement, her eyes widening. Valentine laughed lightly, voice almost cold as he replied "Complications arose at Renwicks."

"I don't-"

"Cynthia. I won't repeat myself again- you cannot see him."

Cynthia was hurt. What would Jace think after they'd parted the last time? She'd basically hooked him up with Clary and… she was to never see him again?

She felt like crying.

Valentine got to his feet now, picking up the Cup once more. "Jonathan. We need to talk, you and I. Come." A pause and Jonathan got to his feet, leaving with his father.

Cynthia sat there in silence, feeling morose and depressed- was she going to be cooped up in this place forever? She was eighteen. An adult. She could do anything she wanted…

But she couldn't leave. She loved her family and Jonathan too much to do that.

Plus Valentine would hunt her down and bring her home. She knew that for sure.

Probably lock her in the cellar too to keep her there.

-LightInYourNightmare-

Cynthia slept alone that night, curled up in bed thinking- her father knew of her and Jonathans relationship for sure. Jonathan had caught her by surprise one night at dinner by kissing her out of the blue as he got up, right before his father. Maybe it was to see what his reaction would be Cynthia had wondered, just watching the mans reflection on the glass of her cup; he hadn't looked bothered in the slightest. It made her suspicious- why had he said nothing? Surely he was against the idea?

Or maybe he wanted it to happen Cynthia told herself, wondering why. His words on them maybe getting married and having children were still ringing inside her head.

Maybe he did want them to get married and have children. It wasn't some shit about continuing the Morgenstern bloodline; it was something deeper… like what their children would be like.

The mere thought made Cynthia's blood run cold- if she and Jonathan had children, there was no telling what they would be like with both its mother and father part demon. Monster Shadowhunters that possessed skills and powers to surpass or rival their parents.

She slept until Maria, the maid, walked in and told her that her presence had been asked for in the training room, and to change into something to spar in. Cynthia rolled her eyes and got to her feet, yawning sleepily. It was the crack of dawn. Swiftly she pulled on the bottom half of her gear and a black vest.

As she neared the room, she could heard the loud metallic crashes of swords. Jonathan being a pissy little shit no doubt. But Cynthia stopped dead in the doorway as she was faced with the sight of the demon boy crossing blades with his fathers. She'd never seen them both of them looking quite so normal. Especially Valentine. He actually owned a pair of jeans-?

They were both clad in black jeans and matching dark t-shirts, long and deadly blades in their hands. Cynthia watched in fascination as neither man held back against the other, their swordplay almost a dance. Jonathan's expression was a dark look of concentration almost, forcing his father backwards with next to every hit. Valentine was strong, and fast too… but his son was more than that.

A minuet later, Cynthia watched the mans sword crash to the floor , the side of his shirt sliced cleanly from where Jonathan had caught him unawares with his blade. Dark red blood could be seen through the torn fabric.

The demon boy smirked at his father, raising his blade to rest over his heart "I win Father."

Cynthia watched the pair with their chests heaving with surprised eyes- she hadn't thought it possible to beat Valentine like that. So smoothly and effortless.

He lowered the blade now, turning to Cynthia where he threw the sword to her, causing the girl to catch the hilt before it sliced her arm. "Your turn" he smirked out, patting her shoulder once before standing before the door to watch.

"Do you need an iratze?" she asked her father as she stood before him. Valentine shook his head "Later. It's merely shallow. Are you ready?"

Cynthia nodded, raising the blade before her with her eyes sharp. She wasn't going to win, she knew that. Not only was he a lot bigger than her physically, but he also had speed and years of experience. What did she have? What he'd taught her over the years, that was all.

It was as she made the first move that she realized something. She had something Valentine didn't have… and that was demon blood. She could be like Jonathan. No. She was like Jonathan.

With the thought firmly in her head, she let her mind open and almost wander. Cynthia found she could parry his jarring blow quite easily, her footwork light and clever as she avoided the more skilled moves she'd never truly studied before.

Cynthia caught Jonathan's expression as they fought- he was watching with interest, as if it was some engrossing book or sword he particularly liked.

At first she thought Valentine had let his guard down, but he hadn't. She'd actually caught him unawares. Reluctant to stab him like Jonathan, she merely tripped him up instead, standing over the man with the tip of her blade at his throat. He just stared as he lay there with his back pressed to the floor, telling the girl as she backed up, blade falling to her side "That was amazing Cynthia."

Cynthia watched as he got to his feet once more, clapping her on the shoulder "This morning was a test for you both to show your skills, to see if you both truly are warriors. And I can confidently say you both passed with flying colors. Cynthia especially."

Jonathan scowled and his father didn't need to turn to know he was, merely saying "You were trained more rigorously, Jonathan. Cynthia was not. Keep that in mind before you speak."

The demon boy said nothing.

Valentine left and Jonathan stepped forwards until he was stood before her. He cocked his head a little as he went "I'm leaving for a few days. Maybe longer." With a frown, Cynthia dropped the sword to the floor and twined her hands with his own, asking "Where?"

"Paris."

"And I can't come with you?" she felt sulky at that. He was going to Paris while she was stuck here in this infernal, boring cottage. A pause and Jonathan twirled her around, catching her from behind, pressing his lips to her neck as he breathed out "Not this time. In the future, I'll take you."

"You promise?"

"Yes I do. You won't be bored with me being away anyway. Not with what Father has planned for you."

Cynthia's expression was suspicious and Jonathan chuckled, tightening his arms around her midriff and let his lips wander to just under her ear, whispering out "You're going to get the chance to hold the Mortal Sword."

She understood now, utterly surprised "But that's in the Silent City, with the Brothers. How in the name of the Angel is he planning to steal that?"

Jonathan smirked against her lush skin "You will see with your own eyes. I wish I could be there too to see it. The sheer brilliance and violence of the plan is… beautiful."

Cynthia turned in his arms now, staring into his deep dark eyes as she sighed out "Is there really a need to be so cryptic?"

"Well, it's a surprise. If I told you, Father wouldn't be pleased. Besides, I want to hear about your expression and reaction when you see just what he has in mind. It's going to be hilarious."

Cynthia raised a hand with her eyes narrowing, winding her fingers into his white gold locks and tugging on them deliberately "Hurry back from Paris. Hurry and do whatever you need to do."

"Kill a sap named Sebastian Verlac and dispose of him."

"Whatever. It's boring without you around."

Jonathan cocked a brow at her words, snorting out "You're going soft on me, Darkstone."

"Not at all Morgenstern. Not at all."