Iono', I liked this. This felt more about Shizuoa realizing what she has and officially admitting it, rather than the point being Mio's response. There was always this slight feeling of "one sided" to me, and these two chapters feel like it puts them on equal footing.
That said, it'll also depend on where things go after this, too, though considering the tone of this series overall I don't foresee Shizuka f'ing this up lol.
I do get the frustration though, as Mio honestly had every right to be far more unforgiving and break things up.