It's how the only thing Sun does after Jay instructs him to go to the bathroom
Is to look around to make sure the coast is clear before immediately obeying that says so much. He doesn't argue at all. Doesn't get defiant, or say that he's in the middle of filming. Just does as he's told.
Which gives Jay great pleasure. And for all that Sun puts up a token protest, both because he can't fully accept what he wants and because he enjoys how it feels when Jay forces him
The first thing he does when Jay shoves him against the wall is look at his lips, his own slightly parted. And the only thing it takes for him to allow Jay to touch him is for Jay to say that he can pretend Jay is forcing him. Showing that Jay understands both what his resistant mind needs to let this happen, and that Sun likes it when Jay ignores Sun fighting against him. All of this speaks volumes about how Sun's ability to be disobedient is rapidly diminishing, and Jay's ability to see him completely is rapidly increasing(though I think he was good at it before).
This episode was such a gift.
