I don't really like this, but I wanted to post something because OMGOMGOMGOMGOMG EIGHTDAYSEIGHTDAYS.
BTW, inspired by 'The Ballad of Sal Villanueva' by Taking Back Sunday. AWESOME SONG, LISTEN NOW.
It isn't like Clary to flirt. It isn't like Clary to laugh at jokes that aren't remotely funny, to sidle up close to him, to touch his arm and flip her hair. It isn't like Clary, at all.
But then again, it isn't like Jace to be jealous. Guess the whole world is just out of whack.
His teeth are clenched and his fists are clenched and his muscles are clenched and he's just one big muscle that can't relax as he watches her tell a story, completely oblivious to the bastard's eyes as they rake over her body like she's a piece of fucking meat.
Later on he tells her just what he thinks of the asshole, and she turns red and grits her teeth and tells him just where he can stick his opinion. Then she turns around and stomps away and he regrets saying anything because now all he can think about is her, going to meet him, and that prick had better keep his hands to himself or else Jace just might have to teach him how.
He turns around and sees her there and her face has softened slightly and she tells him this overprotective brother thing is really getting out of hand.
And he falls.
In response to Clary flirting, I don't really see her as the type, so it's up to you as to whether or not you think she really was flirting or if Jace was being a tad jealous/overprotective.