"Wake up, sweet one."
"...Hmm? Who is there?"
"Only a friend. A friend who has been your guardian for a long time."
"...Guardian? What exactly are you?"
"I know, Hex, you cannot see. But do you see the glow in your eyes? I will not nearly be as bright as the stars, but I hope my light is..."
"Ah...there you are...yes, I see your light...but...you're so tiny..."
"Yes...and there are very few who can truly see us. Please, I wanted to show you something...please come."
The doe sits up this night, on her usual spot on the big boulders of the Playground. She stretches and then begins to follow the tiny voice, the dim light just enough for her blind eyes to get a sense of direction. As she continues, she stops, looking around at the lights all around,
"Are...are those all...?", she asks.
"Yes, fairies, not fireflies, and certainly not starlight.", the voice before her replied.
Hex's eyes only took in dim blurs of light, but she could see them - countless glowing creatures of all different colors floating around through the trees.
There were fairies in the Endless Forest, though invisible to most of the deer. They revealed themselves only to those who they thought could keep their secret. Hex was chosen for a simple reason - her eyes would not deceive her.
As she was led on, she encountered another there, who looked up to her. "You see them too?", Harry asked as the doe approached.