
can she just be a lesbian at this point .

But you know, that could make sense? Aristia received the name "Pioneer" from Vita, and receiving a name from Vita means she has as much claim to the throne as Ruve. Jieun is Vita's blessed child and was the foretold partner of the prince. If you spin it a certain way, Jieun is technically the foretold partner of the next ruler -- not necessarily the prince. Ruve is the prince, but that doesn't necessarily mean he will be the next ruler -- Aristia can very well usurp his claim to the throne since she received a name from Vitaヾ(☆▽☆)
...It's nothing going to happen, of course. But it could happen, is what I'm saying ╮( ̄▽ ̄)╭

im just glad their isnt a harem

what concerns me is that at the very beginning they said that she just kinda showed up out of nowhere, something about how she (a hero) suddenly seemed to suddenly appear (in their world? maybe?) and become a beacon of hope.
to me this sounds like a hero summoning from another world that they wanted to keep hush hush so they had her "become" the MC's sister. in which case they wouldnt be biological and therefore she can be a potential love interest.
even if it isnt a summoning and she already existed in this world i still feel like they arent blood related and she loves the guy.
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