This is my first songfic, and it's also my first MI fanfic. I was listening to this song today, and for some reason, it made me think of Isabelle and Simon. The song is No One Else by Allison Iraheta.

Disclaimer: I don't own the Mortal Instruments series or the song.

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Isabelle

Ring... ring... ring... The phone kept making the same noise over and over again, but he didn't pick up. The girl sighed and leaned heavily against the wall. She was tired, but then she was tired an awful lot these days. Not physically tired. No, that would have been preferable to this kind of tiredness. This was a tiredness of the heart, and Isabelle Lightwood was sick of it.

She sat down at her desk, and stared unseeingly at her black and gold walls. She picked her Ipod up from its place among her other things on the desk. She turned it on, more to have something to do that because she wanted to listen to music.

I got myself to blame for this
Got myself to blame for my difficult days
And my typical ways

Isabelle hit pause. She didn't recognize the song, but she wasn't very familiar with Mundie music. She figured that it must be something Clary had tried to convince her to listen to. Clary felt that Isabelle should listen to more Mundane music. The lyrics of this particular song spoke to her, though. It was her fault he wouldn't answer. Her fault that he was mad at her again. She knew that the next time she saw him; he would have that loser, Maia, with him.

Simon always went back to Maia after he fought with her, Isabelle reflected. Simon and Maia were both Downworlders, and despite the fact that one was a werewolf and the other a vampire, they got along well. Simon and Isabelle, on the other hand, fought all the time. It only proved what she had been told since she was little; Downworlders and Shadowhunters did not mix. Especially in relationships.

This time she and Simon had fought because Simon wanted to tell her parents about their relationship, and she didn't. They hadn't killed Alec and Magnus, he reasoned. Therefore, they wouldn't kill her and Simon. She could remember the looks on her parents' faces when they had first found out that their son was gay. They had found out that he was dating a Downworlder at the same time. Neither her mother nor her father had been happy. Right after the war was over and Valentine was vanquished, they had been celebrating with everyone else, only to catch Alec lip-locking with his sparkly boyfriend. But Alec was different. For one, he had always been their favorite child. For another, Magnus was a warlock not a vampire.

Isabelle was the trouble child. She had dated Downworlders before, but she had never been serious about one. Until Simon. She sighed again and hit play.

But you,
You know how to let things slide
I'm all perfect in your eyes
You don't see- all the damage in me,
And,


There's simply no one else
In the world I could ever find
Likes me when I'm low
And still tolerates me when I'm high
You, you got me down
You kept comin 'round


There's simply no one else
I could lean on a thousand times,
Still be there again, and again
And never lose his mind,
You know me so well,
That you can't even tell,


That you're like no one else...
That you're like no one else...

Simon. Every word in this song made her think of Simon. He might make fun of her cooking, along with everyone else, but she knew that he didn't see that as a fault. In his eyes, she had no faults. He didn't think of her youngest brother's death or her dislike of most Downworlders as baggage she carried around. He loved her. When she was happy, so was he. When she wasn't, he only wanted to cheer her up.

She knew she was beautiful. With her long dark hair and tall, shapely body, some would even refer to her as a knockout. But there were times when she looked and felt like crap. Simon was there for her during those times too. Like when she was dealing with Max's death. Simon was always there.

No, nothings ever what it seems,
But you always seem to be
Who you are; even when it gets hard

You, let me kick you to the floor
And you still come back for more.
You're too good.
What did I do to deserve you?

Nothing. That was the answer; she had done nothing to deserve him. But he had taken all of the blows she dealt him, and come back to her.

There's simply no one else
In the world that I could ever find

Likes me when I'm low
And still tolerates me when I'm high
You, you got me down
You kept comin 'round


There's simply no one else
I could lean on a thousand times,
Still be there again, and again
And never lose his mind,
You know me so well,
That you can't even tell,


That you're like no one else...
That you're like no one else...

Oh, Simon, she sighed. She had been afraid of commitment. Heck, she still was. Simon had always taken that as a sign that she didn't care. But she did care. She more than cared; she loved him. But Isabelle had never committed to anything in her life much less anyone. She didn't even know if commitment was worth it.


I told you I'd never love you
You said that it would be okay
You had enough love for us anyway
I told you I'd never need you
But oh you proved me wrong again
And I pray to god that never ends...

How could she need him? She was a Shadowhunter, a Nephilim. She could defend herself against demons. She didn't need anyone. Or so she had thought, but boy was she wrong. Now, there was a hole inside her, one that could only be filled by him. The sad thing was that she wouldn't have minded being wrong, had he been there to fill that hole.

There's simply one else
In the world that I could ever find
Likes me when I'm low
And still tolerates me when I'm high
You, you got me down
You kept comin 'round


There's simply no one else
I could lean on a thousand times,
Still be there again, and again, and again.
And never lose his mind,
You know me so well,
That you can't even tell,


That you're like no one else...
That you're like no one else...

He didn't know. He knew that she liked him, but he didn't know that she cared deeply for him. He didn't know that she loved him. Isabelle looked back down at her phone on the desk. She knew in her heart that she had to tell him, and she had to tell him tonight.

She picked up the phone and hit speed dial. He didn't answer on the first ring, or the second. Just as she was about to give up, he picked up the phone. "Hello?" he asked sullenly. He was obviously still mad at her.

"Hey, Simon," she said, quietly. "I have something important I need to tell you. Can you meet me at the diner in fifteen minutes?"

Ten minutes later, she was sitting in a booth, tapping her foot anxiously. She checked her phone again, but there was no message from him. As she was laying it down, the phone slipped out of her hand. She flinched as she waited for it to hit the floor. But it didn't.

"Missing something?" a smooth voice asked from behind her.

She turned slightly in her chair, already knowing that it was Simon. "Thanks," she said as he handed her the phone he had caught. His vampire reflexes were much better than the Mundane ones he'd had before, and she still couldn't get over how different he looked now that he no longer needed glasses.

You know me so well
You can't even tell

Parts of that song kept running through her head as he sat down in the booth seat across from her. "No problem," he replied, but the look in his dark eyes was brooding. She didn't know what he was expecting her to say, but she was sure she would surprise him. She licked her lips nervously. She was a little scared, but she knew what she had to do.

She was really going to go through with this. "Simon, I just wanted to tell you that..."


That you're like no one else...
That you're like no one else...