The dictaphone

A few nights later, while Louis was asleep, the nice dream he was having suddenly froze, and exploded around him. Louis found himself standing in the middle of some kind of gigantic blank space, with nothing at the horizon;

"Kinda look like this Matrix movie stuff..." he whispered "Is that some kind of lucid dream?"
"It's not a lucid dream. It's even better."

Louis turned around and found a man sitting in a comfy chair, the only thing in this entire nothingness. Louis recognized him.

"Uncle Greg?"
"No, I'm afraid not" lied Greg "Your brain just needed to give me an appearance, and it chose a paternal figure." he said with confidence, enjoying how he was pretending he was obviously a more paternal figure than Donald, even to his son.
"Then who are you?" asked Louis.
"This question is a nonsense" Greg lied again, enjoying how he played with Louis. "The interesting question should be "What am I?", but this time, the answer would be too complex to give. So let's just say I'm sort of a dream so powerful it has the ability to affect reality itself."

Greg let the thing sink into Louis, and enjoyed how the boy didn't argue.

"You are?"
"Yes, Louis. I am. Now, while we're the two of us there enjoying a nice chat in the deepest part of your mind, how have things been lately?"
"Kinda weird..." admitted Louis, feeling confidence within this very clear dream he was having "My sister Teri started growing lately, and she's turning into the hottest girl I know. Her tits are just gigantic. Amazing. And growing! And now, she starts using them to make cams and so with my help so she makes money. Everyone is drooling over her melons, they're so... sexy, it's amazing! I can't get out of my mind the idea of tit-fucking my own sister, it's crazy! I really don't know what to do, I'm confused, just trying to get my best out of this weird ride..."

Greg smiled.

"Yes, but aren't you listening? I'm a dream able to alter reality itself. You could just ask me to correct a few things and this "ride" could be a lot funnier to you."

Louis wanted to ask if it was true, but strangely, he knew it was. This was really a weird dream, indeed.

"So, your sister is turning into the hottest chick ever and you're just standing there, letting her grow... and I'm sure she teases you too, right? So, now that you have the opportunity to be in control, what do you want to happen? Ask, and when you'll wake up, it'll become true."

Greg smiled, waiting for Louis answer...