You were living with the Seven Demon Brothers, Mammon was the brother that close to you, he so protective of you and always remind you or his brother that he was your FIRST, and he get jealous when you spend to much time with his brother.

One day, you were buying a plushie of Mammon, and give him the plushie of himself, he look dumbfounded, but after that, he really love the doll, even buy a mini car for it.

This night, Mammon was just on the living room playing with the plushie of himself, you were bored, you kind of regretting buying him the plushie, since he was pay more attention into the plushie, you have to get his attention for sure.