bruh i hope that's why

I mean like even in these chapters, all the panels with Josh & him, gives me this tsundere vibe. And lol Josh does not seem abused in the slightest. He is a task master with a devoted pet ╮(￣▽￣)╭

okay lowkey you've enlightened me i see the tsundere personality now

I dont think so, because he marked Josh but Josh didnt mark him.

So his body isnt tied to Josh, but Josh is tied to him.

I think it became worse, because Chase slept with someone he can't remember.
Chase is afraid of losing controle during his rut, afraid of raping someone and he only remembers bits and pieces of the night with Josh. He doesn't really know what happened, consent is important here (looks like the Miller parents made sure all their children are aware of that.), he is afraid that he raped that person (Josh) . So after that night it must have put him under much more stress.