I really love this
The letter is kind of short though, but i still like it very much

I'm very agree at the plot that they both have feelings for each other but never said it and don't have romantic relationship or anything, unlike most other rivetra fics. That make this story really suit to my liking
Another great feat, I don't sense any OOC-ness in this story. That's a hard and really great job you did!

Thank you for writing this and good luck at whatever you do

Amazing
I can relate to this fic so much and I love it for this

Damn it why did I read this? This is awesome and a real tear-jerker.
...Which is probably why I read it to the end.

This is so beuatiful. You prayed Petra's words perfectly and Levi's reaction is what I would have expected.
This is amazing.