you got ordered by Diavolo to investigate something, and you agreed.

"Okay cool"

You said, then lucifer spoke up:

"Hey, be safe"

"I will"

You answered and smiled before walking away to investigate that Diavolo said, then Mammon and Leviathan looked at eachother trying not to laugh, and mocked Lucifer‘s words, that he said to you:

"Be safe~"

"I‘ll be so safe~"

Then Lucifer spoke up again, but more annoyed:

"You guys stop. Stop"

A slight blush came across Lucifer‘s cheeks and coninued to speak:

"I‘m gonna kill you"

Then Mammon spoke up:

"But how will that keep us safe~?"