Richelle E. Goodrich said this quote

Gavin, I can’t talk to you here. People will call me crazy. My imaginary friend smirked. But you’re already talking to me. Well, I have to stop. His smirk grew cocky. I doubt you can resist. And he was right. There was nothing I wanted more than to give my full attention to an imagined shadow and ignore those who ignored me in the real world. I wanted to talk out loud to Gavin―to play and laugh boisterously with him. In a dream I could justify such behavior, but to succumb to hallucinations while wide awake would only prove me insane.