Since next chapter likely ends the volume, I'm guessing Sakurako sees Yuhi and bails her out of the situation. Yuhi has to open up now that the problem is unavoidable. After all, we still weren't given any more context of back when she rejected Sakurako. And I'm pretty sure Yuhi already realized it was her by the end of volume 1, because of Yuhi's thoughts in the bath and calling her out on keeping secrets of her own.
Yuhi will also need to work up the courage to tell her sister about what happened both in the past and now. Also, since it looked like Yoshino rejected Mashiro in the flashback leaving her heartbroken, I have to wonder if this is Mashiro's revenge against Yoshino. To make her fall in love and confess only to attempt to cheat on her with her own little sister. Though using Yuhi as a replacement even prior to that shows that she was a garbage person from the start.
Considering this major escalation, I'm starting to wonder if Aoi will be reduced to a gag, as payback for getting Yuhi to leave the meeting spot in chapter 1. Aoi is only an opportunist, she isn't invested in Yuhi the way Chiwa or Mashiro were depicted as.
And finally, Chapter 10 Part 1 doesn't have a release date yet, so next chapter might take awhile.