And then there was Jace, standing of at a little distance as if he didn’t quite belong. He
was all in Shadowhunter black like the others. When Simon wore all black, he looked like he
was on his way to a funeral, but Jace just looked tough and dangerous. And blonder. Simon
felt his shoulders tighten and wondered if anything—time, or forgetfulness—would ever
dilute his resentment of Jace. He didn’t want to feel it, but there it was, a stone weighing
down his unbeating heart.
Something seemed odd about the gathering—but then Jace turned toward him, as if
sensing he was there, and Simon saw, even from this distance, the thin white scar on his
throat, just above his collar. The resentment in his chest faded into something else. Jace
dropped a small nod in his direction.
— City of Glass by Cassandra Clare
Chapter 1: The Portal
Did you know there is a small contingent of Jace/Simon shippers? Do you want to know why? Passages like this are why! Seriously, I’m a die-hard slash shipper and my slash goggles have been welded on to my face a long time ago. However, it really doesn’t seem like Simon is jealous of Jace, no the subtext makes it feel like Simon wants to bone the fuck out of Jace!
For the record, I don’t think Cassandra Clare actually meant to write this. Oh, for sure she read some Harry/Draco stuff back in the day. She even contemplated writing some at one time. And since Jace/Simon is basically Harry/Draco this would be right up her alley. Unfortunately, this would actually take away from her self-insert Clary. If Jace and Simon got together, their attention would be on each other more than her: and we couldn’t have that, could we?
No, much like I pointed out during the “City of Ashes” outtake “Because It’s Bitter”, Cassandra Clare is a suethor and most suethors are completely incapable from writing for any POV other than their self-insert. This is not the voice of a teenage boy, but rather a middle age woman wanking over her self-insert’s love interest which is nothing new. Actually, this a good majority of what Clary does on a day to day basis.
So by failing to write to realistically write from Simon’s POV, she accidentally wrote romantic subtext between Jace and Simon without ever intending to.