From the same guy who posted the spoilers up above.
Quote:
Tatsuya was convinced they were siblings because their psion waves were so similar to his elemental sight or something like that, but Maya just told him that Miyuki was artificially created that way on purpose to suppress him, so I would go out on a limb and say that they really aren't siblings.
The next arc will probably have Tatsuya struggling to come to terms with it. In fact, this entire thing might just be a setup from Maya to try and force his emotions to surface by creating a contradiction. He's programmed to only love his sister, and now he's learned that the person he loved all this time isn't his sister.
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He himself is not sure.