You took mammon to the human world because what could be a better date idea than taking a demon to the human world.

"You know you're so lucky he great mammon accepted your date idea! The great mammon is too good for this place!" Mammon ranted off not realizing that you already walked away

"Wha-" he finally realized that he lost you "Human?? Human where did you go?!" He panicked

Some people approached him thinking he's cosplaying to which he responded

"What's a cosplay??"