"Whoa," Rainbow Dash exclaims as the world around her is replaced by an endless white void. Nothing exists in any direction. There's also a strange sense of disconnection, like a guiding force behind her has suddenly been ripped away. "What happened? Is this the first challenge?"
"No, you featherbrain." She jumps as Trixie suddenly appears from nowhere, looking none too pleased. "There's nothing here because nobody was supposed to ever come here. This is a void. An absence. There's nothing here because it's not part of the story."
"Oh... kay?" Rainbow Dash offers hesitantly, though the explanation has done nothing to clarify things. "So if this place isn't supposed to exist... why are we here?"
Trixie snorts derisively. "We're here because because somebody couldn't follow the rules."
"What, me? But I haven't even started yet!"
"No, not you. Them. Hey!" she yells out into the void. "What do you think you're doing here?"
"I thought you said—"
"Still wasn't talking to you. I'm talking to them." She points out at nothing, her eyes searching. "To the reader. Aha!" With a sudden and decisive movement she turns to glare directly at the fourth wall. "Found you!"
Her gaze is intense as her eyes bore into you, steely and accusatory. "What did the author just say? 'Don't use the next chapter button'. And what was the first thing you did? Went and clicked it."
"Maybe it was an accident?" Rainbow Dash offers, eager to move past this and get back to her adventuring. "If they've been on the site long enough then clicking Next Chapter is probably a reflex. Muscle memory, or whatever they call it."
"Pft." Trixie is unmoved by her rationalization. "A likely excuse. I bet they didn't even read the author's note. Just scrolled right on by like the EULA on some suspiciously free software. You know, if the BBcode would let me, I'd definitely be going full Monika right now and call you out by name, [Print.string(get.Username)]!"
"Geez, you maybe wanna take a chill pill, Trix? Don't be so hard on them." Dash brightens as an idea comes to her. "Maybe they already played to the end and now they're just going back and looking for secrets and Easter eggs."
Trixie huffs once more and gives the reader a glare. "Fine. Whatever. You want an Easter egg? Well here's an Easter egg for you!"