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I would imagine the Devs will address this at some point, but it will probably be in an organic way that fits well with the overall story. I would guess that MC or Asterion will mention it to the other either before they first have sex, or shortly after that. That would seem to be the logical place, as things are serious between the two at that stage, and they would likely do it as a way to further their ongoing relationship.

Hope that helps!