A/N: Okay, so this is my first Malec or songfic… I was listening to this song and thought it would be perfect for Alec. And Izzy's involved because well…she was the only one who thought it was as adorable as we fans did. Anyway, please tell me what you think!

Oh, when words in the song are bold, Alec is yelling. The song itself is in italics. Just figured I'd let you know.

Disclaimer: I don't own our beautiful sparkly warlock or his gorgeous Nephilim boyfriend. Or Isabelle. Or the song. Or anything but the plot/idea.

Alexander Lightwood glanced around his room, checking the hallway quickly before shutting the door and pacing. After a few minutes, he started to think out loud, the words coming more as a song than thoughts.

"If there's a prize for rotten judgment
I guess I've already won that.
No man is worth the aggravation;
that's ancient history, been there, done that!"

He shook his head disgustedly, remembering Jace's reaction when Izzy had accidentally (yeah, right) said something about Alec's 'crush' in front of him.

Alec jumped when his sister walked in, joining in his song.

"Who'd'ya think you're kiddin'?
He's the Earth and heaven to you.
Try to keep it hidden,
Honey, I can see right through you.
Boy, ya can't conceal it
I know how ya feel and
who you're thinking of!"

Alec blushed, knowing she meant Magnus Bane, the sparkliest (and hottest) warlock he had ever met.

"No chance, no way
I won't say it, no, no…"

Izzy rolled her eyes, smirking at Alec.

"You swoon, you sigh
why deny it—uh-oh!"

She broke off as Alec attacked her halfheartedly before turning away, pacing again.

"It's too cliché,
I won't say I'm in love."

He shook his head, thoughts returning to Jace.

"I thought my heart had learned its lesson…
It feels so good when you start out.
My head is screaming get a grip, boy,
unless you're dying to cry your heart out!
Oh…"

Izzy sighed, watching Alec.

"You keep on denying
who you are and how you're feeling.
Baby, I'm not buying;
Hon, I saw ya hit the ceiling.
Face it like a grown-up!
When ya gonna own up
that ya got, got, got it bad?"

Alec blushed again, shaking his head vigorously.

"WRONG! No chance, no way.
I won't say it, no, no…"

He trailed off, thinking about Magnus, unable to stop the smile that slowly spread across his face.

Izzy laughed.

"Give up or give in-
check the grin, you're in love."

Alec's eyes widened in horror that she had seen his smile, quickly going back to denial.

"This scene won't play;
I won't say I'm in love."

Izzy grinned, easily seeing through his frantic lies.

"You're doin' flips, read my lips:
'you're in love'."

Alec closed his eyes, tiring of their argumental song.

"You're way off base,
I won't say it.
Get off my case
I won't say it!"

Isabelle smiled, gentling her tone.

"Boy, don't be proud;
its okay, you're in love."

Alec turned to the window, whispering to himself as he watched Magnus walk up to the Institute.

"Oh…
At least out loud,
I won't say I'm in love."