To those not been following that thread: in that thread I'm just a translator. I didn't originate any of it.
Here, speaking as myself: I think both camps (skeptics vs. believers) are half wrong. Of course everything on twitter under a stage name is a bit... eh... staged. It's pretty convenient that both Sora and Eririka are signed with the agency Declare.
Declare's company website on the very front page advertise their relationship using professionally-polished graphics. It's very hard to fully believe it's purely a spontaneous affair between two individuals.
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OTOH, there's no reason to be so cynical that a media company would fabricate something so elaborate and for so long completely out of thin air. Quite likely the two girls do enjoy each other's company and would hang out together (going on dates) and live together (in the same apartment), take baths together (totally unremarkable for same sex brothers/sisters/relatives/friends), sleep in the same room, sleep in the same bed/tatami (for Japanese, not such a big deal for same sex brothers/sisters/friends/relatives), maybe masturbate together, or each other, or muff-diving everytime they can. All these things might be happening (at least before the rumored break-up), with the approval/support of their agency and studio(s).
I think sexual orientation for Japanese and many non-Western cultures doesn't
define a person. In the West, one is either hetero, homo or bi. Like one is either Catholic, Protestant or Infidel.
We don't treat sexual activities or sexual preference that way. To us its like calling one is a rice-eater, vs. noodle-eater. Or in slightly related terminology, one is herbivore (食草系, meaning unambitious in career, relations, and life) vs. one is carnivore (食肉系, meaning ambitious). Yes it describes a personality but never meant to be black and white and immutable.
In modern day Japan, with statistics of marriage rate, birth rate, sexual frequency etc all going steadily down, a lot of men and women are spending more and more time with same-sex friends out of
convenience rather what you in the West think of as innate sexual/gender identity.