'Unseen and unheard: They must never know'.
That's the motto of the CMAA, the Cutie Mark Allocation Agency. Nopony knows who they are or what they do, but they're vital to the workings of Equestrian society.
This is the story of two of these unsung heroes of the pony world, who selflessly sacrifice their time and energy for those blasted mysterious cutie marks that the ponies seem to like so much.
(Thanks to Zemious for the excellent cover picture for this story!)