Gonna cover a few separate topics in one post vs separating them out. And I'm using the SPOILER tag so skip this if you want.
I like having Mio POV to help fill in some of the story gaps. It's a nice add other stories and games leave out, but a feature that may not be frequently repeatable.
I do think that Mio's corruption should be slow burn much like as Yamato given her previous teasing/testing the waters for Yamato. So ya, I think she fell too hard to fast. Unless there's a Akemi tie in (such as her being Akemi).
And I think there's a continuity error or it could be me. Ota sends Yamato the video fucking Mio. In the POV, Mio confirms they didn't fuck at their first encounter. Did he send a copy his video recording of their second encounter fucking to Yamato claiming it was from their first? I have to go back and double check unless someone here straightens me out.
I also lost immersion when Mio blew up on his on the "Love" path. Given her amount of care and patience up to that point, I can see her being hurt or frustrated with Yamato. But her blowout was so unlke the character. I'm surprised the story had Yamato return home that evening. I thought he would have left for his work apartment to lick his wounds, wallow in self-pity, and leave Mio out of self deprecating unworthiness as she deserved better than him. He loves here, but self actualizes he has a fetish that is self-destructive to a normal relationship.
Also, if Mio is taking Ota's length and girth down her throat to his hilt, she needs some backstory on that throat training as managing a gag reflex on size that takes time, plus the throat stretching training. I can let Akemi's going to the hilt on stream have a pass.
And I still want to know about flipping Akemi's stream in relation to the Mio and Yamato. Why the hell does Akemi look like Mio with a covid mask on? And if she is Akemi in some way, then she's be NTR'ing Yamato already.
There's still opporunities in this story to be rounded out. Please consider tightening up some loose ends.