@Starbright define your “she wants to progress more like a couple”.
They live together, care for each other, share the fact that they are both perverts, and his family -even if they are obsessed with fetishes too- really like her.
What “progress” she should want?
Him being less absordbed in his fetish? Big brain play, considering that she is on par.
Him caring for her? Already established that it’s already like this.
Marriage? Never talked about it (but I’m sure he’ll propose, just give him time, it’s not much that they are dating)
Kids? Never talked about it (and I think he wouldn’t be against it)
So?
I mean, he should stop acting like he did in the last few chapters and sometimes just don’t fall into provocations...that’s true.
But it’s still a situation that SHE created for NO valid reason.
And his current situation already explained how much he cares: it’s still a pervert obviously, but all I read is “Kotona left me” not “I miss her hair”.
EDIT : on top of that she is unfair too: she is really jealous...with some reason; but in a “what if” situation, if he was the one to run away, she would have been so suspicious of him, like “who have you been with?” and such.
What if he reacts the same way? She didn’t even considered it for a second.