Bruh. I don't think lesbians have their rooms fill with pretty girls poster thought. My room was filled with soccer team player, does that mean i'm gay or that i just like soccer ? Kurokawa being into yaoi doesn't mean she can't be lesbian. Hell, they can be both bi for that matter, it's not because they were into boys before that they can't be into girls now.
I mean, comparing soccer posters with handsome men is not the same. Handsome men is connected with sexuality, soccer is just a hobby.
And I never said they're not into girls. I'm precisely saying that they can be into girls too without being a lesbian. Because I was replying to a poster saying they they're now lesbians, to say they don't have to be lesbians to like each other, so it's not unrealistic.
We don't have an actual proof of their sexuality, so everyone can interpret it differently.
A similar situation imo is Yuma from NTR. Like Nanaki, she had a bf and cared about him as a friend. But we could see she was struggling on the intimate parts and with being in love with him.
Nanaki on the other hand liked being with her bf, whether that was for vanity reasons or not.
She could be vain and want to be with a guy only to show off, but I think there would still be signs of struggling in there, if she was gay.
Anyway, jmo and I don't think that part matters here now.