Idk about this one bro, Mio is right that she hasnt really started anything with Shizuka and that she has always been putting her in a pedestal treating her like a goddess so if they can really start getting to know each other things might work out .....
But Shizuka... Yeah i still dont trust her at all, she went back, she does feel something for Mio i think, but she really needs to move on from Kaoru and i really doubt that .... I mean i hope she does and that she really starts thinking about just making Mio happy and not Kaoru jealous but i doubt it.
Idk it really feels like she just doesn't want to lose Mio's kindness, she feels happy knowing theres someone that accepts all of her and only thinks of her and she uses that to forget how Kaoru couldn't love just her, but shes just using Mio while still thinking of Kaoru, she feels fake .... I cant get behind Shizuka.