Honest answer, tl;dr version: This is the most overt in a long list of scenes I've written that have poked at the boundaries between "this is sexual" and "this is harmful." (There's no agenda or goal to this, so it's not like I keep track of where they are, but if you rummaged around in my fic looking for them, you'd start to pick them up. I just noticed that this icon is one of them.) A common smut scenario around these parts is "X bends Y over a desk and has his way with him" - and, listen, I'm not hating on that; I've written "Stephen" fantasizing about the exact same thing. But even though it's hot, there are these oddly violent undercurrents. So this is the deliberate inverse: it's violent on the surface, it's not supposed to be sexy, but at the same time there is sexual subtext. And that's not accidental. (Stephen's reaction has its own set of messy implications, but that's another essay.)

Honest answer, short version: I don't know how far this snapped!Jon was ready to go. Which is why I unsnapped him quick, and put on extra disclaimers.