Okay, this is my attempt at writing a possible City of Heavenly Fire based on snippets, spoiler art, and theories. Obviously, my version of CoHFwill NOT be as wonderfully awesome as Cassandra Clare's and my characters will NOT be as funny. Enjoy!
Note: Since I used and will use official snippets, this MAY CONTAIN SPOILERS

Not much had changed at Magnus's since the first time Jace had been there. Jace used an open rune to get through the front door and took the stairs, buzzing Magnus's apartment bell. It was safer that way because Magnus could be playing video games naked or really anything. Magnus yanked the door open, looking furious. He was wearing a black silk dressing gown, his feet were bare, his dark hair was tangled, "What are you doing here?"
"My," said Jace, "You're so unwelcoming."
"That's because you're not welcome."
"I thought we were friends," said Jace.
"No, you're Alec's friend, Alec was my boyfriend so I had to put up with you. But now he's not my boyfriend so I don't have to put up with you."
"I think you should get back together with Alec," said Jace.
Magnus looked at him, "And why is that?"
"Alec has been miserable since your breakup. He hasn't been eating much, he's been neglecting his training, and he'll barely talk to anyone other than Isabelle and I."
Magnus rolled onto his back and put his feet up on the arm of the sofa. "What do you care if Alec's miserable?"
"What do I care?" Jace said, so loudly that Chairman Meow rolled off the couch and landed on the floor. "Of course I care about Alec; he's my best friend, my parabatai. And he's unhappy. And so are you, by the look of things. Takeout containers everywhere, you haven't done anything to fix up the place, your cat looks dead—"
"He's not dead."
"Whatever. I think-"
"Think what",Magnus asked.
"I think," Jace said, "that you don't want to tell your secrets, so you decided to break up with Alec because..."
"Why should I tell you why I broke up with Alec? It clearly isn't any of your business."
"Can't blame me for being curious."
"Get out."
"Excuse me?" Jace was quite shocked. Magnus had never really been the kicking out type.
"You heard me. Get. Out. Do you know what I think? I think that you only came over here so that you could try and get me to be your pet warlock again."
"Magnus. That's not-"
"I don't care. Just go."
"Fine. I'll leave you alone with your takeout containers and your dead cat."
"He's not dead!"


After Magnus's apartment, Jace had gone over to Luke's house to meet Clary. He told her all about Magnus, all the way from the countless takeout containers to how dead Chairman Meow looked.
"So he really kicked you out?",Clary asked when Jace was done.
"Well he didn't kick me out, he sent me off. There was no time period where his foot connected with my gorgeous body."
Clary rolled her eyes. "How's he even dealing with this?"
"Not well. I'm not sure who deals with a breakup worse: him or a teenage girl who chooses to drown her sorrows in ice cream."
"Not all teenage girls are like that after a breakup. I wouldn't be like that."
"Nor will you for I have no intentions whatsoever to break up with you."
"Works for me." She smiled. Jace always loved seeing her with the small smile she had now. That was why he just couldn't have helped leaning closer to her and attaching that smile with his.


As soon as Jace kissed her, Clary felt the small spark again and she jumped back.
"Oh right, the holy fire",Jace said, suddenly remembering.
"It's called heavenly fire, Jace."
"Heavenly fire, holy fire, whatever it wants to be called it still prevents me from being with you the way I want to be with you." He put his hand over her's.
"Don't worry, Jace. We'll get through this. We always do."
"I think you're right. After all, we've already gotten through your crazy psychotic father, no offense, facing the Angel Raziel, facing Lillith, and we've gotten through me being bound to your demon maniac of a brother."
"Yeah, we've been through a lot together."
"Yes we have. What's next? Meeting Jonathan Shadowhunter? Finding out a Silent Brother is related to one of us? Making out with an Iron Sister?"
Clary punched him in the arm. "Jace!"
"Relax. I have eyes only for you." He put his arm around her shoulders and she snuggled closer to him; her head rested on his shoulder. These were the moments that mattered. Although they couldn't go as far as she would've maybe hoped, she still had Jace the way she had wanted all along.


When Clary walked into the library, she saw Maryse and Brother Zachariah seated.Clary's moment with Jace was unfortunately interrupted when Isabelle had called her saying that Maryse wished to say something to her. So, here she was in the library. Jace stood next to her and Alec stood next to him with Isabelle at his side.
"I bet that you are all wondering why I asked you here",Maryse said.
It was Isabelle that spoke. "Is everything okay, mom?"
"Everything's fine, it's just that...Brother Zachariah, why don't you tell them instead?"
The Silent Brother nodded. A few days ago, Maryse, Brother Enoch, and I discovered something deeply disturbing that had been sent to the Institute, Brother Zachariah said in Clary's mind. According to the looks of everyone around her, the Silent Brother was speaking to everyone.
"What was it",Jace asked. Jace had to be interested in this news, or he would have responded with a sarcastic comment. Brother Zachariah continued.
We discovered a pair of angel wings. Strange was that fresh angel ichor dripped off of them meaning that they had to have been ripped off an actual angel. Along with the wings came a note from Jonathan Morgenstern.
Clary tensed at the sound of her brother's name.
The note consisted of only one word: Erchromai.
"I am coming",Jace silently added.
"Indeed",Maryse said, appearing to have heard him. "What this means is that Jonathan Morgenstern is coming here possibly for us. It appears that the angel wings were a possible symbol of his motive. I believe that it means that he wishes to destroy us." Jace tightened his grip on Clary's hand. He had to have felt her body tense.
"Well, what do we do",Clary asked. "We can't just let him come here and kill us all."
We are trying to create a possible solution, Brother Zachariah said.
"In fact",Maryse began, "We have collected some of the angel ichor in the hopes that it may somehow help us defeat Jonathan. Maybe if we were to ask Magnus Bane he could give us an answer. Alexander, if you could ask him, that would be wonderful."
"Why should it be me",Alec asked. It had been the first words he had said to his mother since his breakup.
"Well, out of all of us, you are the one closest to him. After all, you are dating him-"
"Not anymore!"
"Excuse me?"
"We broke up! And guess what? I really do NOT want to talk about it!"
"Alexander!"
Alec didn't say another word. Instead he just stormed off to who knew where.
"I'll talk to him",Jace said before he ran after his parabatai.

Thanks for actually reading through the whole first chapter! What I really hope for is at least 1 review telling me whether I should continue or not so PLEASE if you have time, review and I SWEAR ON THE ANGEL that I'll reply!