Thanks for translating! I hope the new girl that has been teased don't start unnecessary drama. We already have yuri not as mainplot (as of yet it's more about vtubers) and introducing drama would feel annoying. Drama of a third wheel that makes the main couple realize their feelings for each other can be fine to some extend, but doing that when the yuri is not properly established AND when it's taking a backseat to the mainplot, would not feel good to read.
It would only hinder the mainplot, hinder the yuri for some chapters and not be comfy to read. That's just been my experience with past works so far that don't have yuri (as in the relationship of the main characters) as the main plot, but other things (cooking, sports, etc). Let's hope for the best.