(n.) a moment that seemed innocuous at the time but ended up marking a diversion into a strange new era of your life
for the August Prefect Inter-House Friendship Challenge
Giving credit where credit is due:
The term 'keyframe' comes from John Koenig's Dictionary of Obscure Sorrows.
This fic was also inspired heavily by Sleeping At Last's Saturn, and particularly the lyric, "You taught me the courage of the stars before you left / How light carries on endlessly, even after death."
Also, a clarification on the advisory: there are thoughts of suicide, but the character does not commit suicide in this fic.