It’s almost verbatim from Skin Deep, in some ways when Belle asks about Baelfire, while they sit on the table.
“There was. There was a son..but I lost him”
But they could be doing it about PP too. The “lost him” thing was what clued most of us into Nealfire Pan (or at least that Bae was in NL at some point). This could be the same but for PP. It’s just a reference to PP being king of the lost boys.
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"He was a lot of things to me" "The only conclusion was love"