Ai! This is so beautiful! So fraught, so gentle, so poignant. And a really working of the prompts.

Ah, this was wonderful and touching! A great concept, too, Elros writing to the future Elrond. Whose children he has foreseen. <3

I love this. Elros is SUCH a character to me, and the way he talked about the uncertainty of death as a peredhel was an interesting and compelling look at it. 

  "Or perhaps you will one day, far in the future, when you sail into the west? Perhaps you will stop for a time on our island and see what my children and their children’s children have made of it. Oh, I hope that you will, and I hope that it will be as beautiful as I imagine it now."

Those lines are so painful, alas the Numenor fell! I really feel like, were they to be kept on Tol Eressea, it would be a comfort and a pain for Elrond to be confronted with these letters that are a loss of his brother, and of Numenor, whilst also dealing with the loss of Arwen, who also chose Elros' path, and the dream to rebuild a mighty kingdom which, like Numenor, may also fall terribly.

IDK this fic is bringing many thoughts!

What a beautiful thing this is. It is so real that I could just imagine sitting in the corner of their tent listening to the rain patter on the canvas watching as Elros writes, pressed up close to his brother. He holds the paper and pen, balanced at an awkward angle on his lap so that he still has a hand free to stroke Elrond's hair. He is so thoughtful and full of life the way you write him. It is delightful.

So many feelings Elros packs in here. Really well done.