Currently mammon had stolen Lucifers credit card which he spends endlessly as much as he can get away with without lucifer noticing, as he got home seeing u speaking to lucifer wondering who u were despite seeing u a couple times before

He watched pouting from the door before u had finished, about to go to ur room before he came out from behind door

“Why were u speaking to him?”

feeling envious, he was tasked with caring for u, not lucifer, hes greedy & secretly wanted u for himself