[From the start... perhaps that would have been the logical starting point in all of this. But figuring out what to say, knowing it's possible Kaeya may not entirely believe him, just made it all more complicated. Nevermind the fact that he's only ever really explained all of it a handful of times.]
...you already know part of the story, from when you were in my soul. My sister and I aren't from Teyvat, or... even the same world. Before that, we'd visited countless worlds together, traveling through the skies like a pair of shooting stars.
[A metaphor that may be more literal than anything.]
I don't know how much time Lumine spent on Teyvat before she woke me up. But my first memories were of her pulling me out of the meteorite we arrived in, and... telling me that the gods destroyed Khaenri'ah and threw the world into chaos. And that we had to leave.
[Which answers why Lumine might recognize Kaeya's heritage -- as she may very well have been there during Khaenri'ah's height, as well as during its destruction.]
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...you already know part of the story, from when you were in my soul. My sister and I aren't from Teyvat, or... even the same world. Before that, we'd visited countless worlds together, traveling through the skies like a pair of shooting stars.
[A metaphor that may be more literal than anything.]
I don't know how much time Lumine spent on Teyvat before she woke me up. But my first memories were of her pulling me out of the meteorite we arrived in, and... telling me that the gods destroyed Khaenri'ah and threw the world into chaos. And that we had to leave.
[Which answers why Lumine might recognize Kaeya's heritage -- as she may very well have been there during Khaenri'ah's height, as well as during its destruction.]