Don't look back

Mary is four, and running, running, running. Running from the monsters, the terror. Running for her life, in no real direction. Then she meets a man who can save her, but for how long? Because life will never be the same again.

"No. Sweetie, we don't look back. We look forwards."
"Why? Why can't I look back?"
"It's too sad. Just... Look ahead, with your chin up, and always in my sight. That's all I ask. Those three things."
"What if I can't? What if you're gone one day?"
"I'll never leave you. Okay? I promise."
"Doubly promise?"
"Doubly promise."

A Walking Dead fanfiction ?