Fluttershy doesn't know what's up with Twilight. All these experiments... they make her quite uneasy. Until one day, a virus breaks out in Equestria. The source: Princess Twilight Sparkle's lab. The effect: countless of the worlds population being taken over.
One promise she took. One reason to live.
She fights the disease.

Rated Mature:
Strong Violence
Blood and Gore
Strong Language

Written for One-Shotober 2014! Check out the group by clicking here!