Lililia's dream mentions a meeting in a section five, two tea leaves being two lights, and not mentioning the sun -- I think this is about Theo and Cynthea.
Cynthea is obviously associated with the moon, and I think Theo is associated with the sun. (Among other things, silver hair and gold hair). But also what greeting happens in Volume 5 of this very manga? Cynthea and Theo.
If so, then I wonder what she means about not talking about the sun. One thought is that part of her subconscious knows that she is being influenced by Bellir and is making sure not to mention Theo to him too much, as he is the only one who can really protect Cynthea from his meddling.