Bill was searching for villains to trick into helping him. He was sitting on a sofa in the mind scape looking through the records of living villains he flipped through not finding a single good one.

"President Snow? No he's from the future. Voldemort? No he just has a stupid wand," he said to himself, "Hawkmoth? Let's see has the moth miraculous. Perfect! It is so easy to manipulate those miraculous holders."
***
Gabriel was sleeping. He saw a floating yellow triangle in front of him.
"What the..." he said.
"Relax Hawkmoth," said the triangle.
"Who are you?" Asked Gabriel.
" I'm Bill Cipher, The one and only dream demon," said Bill.
"Dream what?"
"Okay here is the thing, I have powers you couldn't even imagine and you have a miraculous, so I am proposing we make a deal," said Bill.

"Uh... so what is the deal," asked Gabriel.

"So I'm going to bring my enemies to Paris and you try to destroy them," explained Bill.

"What about my end of the deal?" Asked Gabriel.

"I'm so much more powerful than the ladybug and black cat miraculouses I can grant you that one wish," said Bill. He held out his hand Gabriel shook it sealing the deal.

Sorry it's so short