Alec.

( Clary's doing her best to sound disapproving, but there's little she can do for her bright and blooming smile. ) Come on, you're letting down the team. Even Jace has danced with me.

( Technically, Jace would probably do anything Clary asked right now. But she's going to use that regardless. )

Besides, you want to live up to your full costume potential, right? Magnus would too. ( Would he? Who knows! )