The characters within the story seem pretty open-minded about the idea of fem-fem relationships ... or perhaps its Hazumu's special background making it ok with them?
For silly reasons not worth going into, strong female relationships don't get the same panic from the lynch mob as strong male relationships. Class it as irrational fear of the closet.
ah well... I can see why Tomari was so confused --- she (like most people) had this Plan A of how her life was going to go. And then things happened.