I have just remembered that I have another Silmarillion-related AU. That is also marginally related to story of Ncharr.
By marginally I mean she is a background character in the second one, being very happy and content with her married life with Miriel (numenorean one). They have a sweet sea-side cottage.
Practically that second AU is about Lily and Twice Junior. Lily being moderately weird human kid and Twice Junior (third Curufinwe in a family, therefore Curufinwe Twice Junior) being equally weird elven kid.
And just do kid stuff in Aman. Build sandcastles, visit all the family friends, explore the land starting from Feanor's backyard, play make-believe, you know. Typical kid stuff.
And that's basically the whole thing. As they grow older scope of innocent adventuring slightly grows. But like. Only good and chill things here. And pancakes with strawberry jam.
Addressing the elephant in the room, yes there is a very convoluted plot reason as for why Lily's very human family ended up in Aman.
Has a lot to do with her older siblings, concepts of the Second Music/Arda Healed and also this one thing from the early Legendarium where, if I recall it correctly, early Turin and Nienor got some pretty legendary blessing involving among other things bathing in magic fire and following this moving to live in Aman and finally having something good in their lives.
Old Legendarium is absolutely wild sometimes and I love it so much.
In any case. I have this AU too. Mainly about these two children, later teenager, then young adults, sometimes about their various relatives and acquaintances too. Including at least one talking cat, several baby sosig dragons, Ingwe bribed into teaching musical instruments and a whole lot of overcomplicated inventions for miniscule problems.