Requiem

by Aqua Bolt

First published

Octavia and her childhood friend Allegro con Brio have grown distant ever since he moved away when they were thirteen. Now, caught in a dream, she must relive a series of scattered memories of him through the helpless eyes of an observer cursed with the gift of hindsight.

Tagging it as a "romance" fic seems a little inaccurate, but fairly close