I can stand the sight of something eating my eyes. I don’t want to think about something eating my brain. I don’t like the looks of something eating my face either. But I loved this story! Even though it did gross me out a bit. []o)

So full of possible conclusions! Yeah!
Since the creatures eat the face, then the eyes, then the brains, the stage is set. Since there is no prequel or sequel, I am going to assume “she” is one of them. She wiggled into his brain an was able to get him to unload his gun. The last thing he sees is her, hungering for his grey eyes:
“So darling, I have to eat them."
LOVE IT!

Creepy.

The way of speaking reminds me a bit of Firefly – loved that show. Great story, great premise.