Passion!

Mammon: The Avatar of Greed

Lucifer: "Well, you've got that done now, and it seems the idiot has arrived as well."

Mammon: "HEY! Just who do you think you, are, human? You've got a lotta nerve summoning the Great Mammon! Listen up, because I'm only gonna say this once. If you value your life, then you'll hand over all your money now! And anything else of value, too! Otherwise I'll wipe that stupid, happy-go-lucky look right off your face... by eatin' you! Startin' at your head and working my way down, until-" 

Y/n: I shouldn't use my full strength.

Y/n backhands Mammon into a wall.

Y/n: "Oops."

Everyone stares at her.

Y/n: "I guess I don't know my own strength."

Diavolo: She was holding back. I was holding her back!

Mammon sits up holding his nose. Y/n blinks at him.

Y/n: "Are you okay?"

Mammon: "No! You slammed me into a wall."

Satan: "Y/n, Mammon here is the Avatar of Greed. He governs and oversees all forms of it. Whenever he takes a liking to someone, they suddenly find themselves awash in money. But from what I hear, if he decides to break it off with someone, that wealth evaporates. They're left without a Grimm to their name."

Asmo: "And he's also a masochist. That part's important."

Lucifer: "Indeed. And it just happens I have a job for my masochist of a brother."

Mammon: "Y'all, stop telling lies! I ain't asked for that hit, and I A'INT a masochist!"

Lucifer: "Mammon, you are going to be in charge of seeing these two humans' needs during the whole exchange. I except your full cooperation."

Mammon: "What?! Why me?!" 

Asmo: "Aww, lucky you, Mammon! I'm so jealous."

Mammon: "All right, then why don't you do it, Asmodeus?!"

Asmo: "What? Hello no, too lazy."

Mammon: "I thought you said you were jealous of me?!"

Satan: "Just give up, Mammon. There's no getting out of this. You know you can't refuse a direct command from Lucifer, correct?"

Mammon: "But why does it have to be me?! What about Beel. Why can't he do it?!"

Asmo: "This isn't a job we can entrust to Beel. We might as well ask him to eat them."

Beel: "Mm, yeah. I can't promise I wouldn't."

Mammon: "You're useless, you know that?!"

Lucifer: "...Mammon?"

Mammon: "...Wh-What?"

Lucifer: "Surely, you're not going to tell me that you object to this arrangement, are you?"

Mammon: "...! Ugh... I hate you guys! Every last one of ya!"

Y/n: Huh. Well, I shouldn't get involved more than I already have.

Mammon: "Fine... Fine! I'll do it, okay?! All right, human, listen up. As much as I don't want to look after you, I've got no choice. It's a huge pain in the ass, and I'm too important for this kind of thing, but Lucifer told me to do it, so I will. But in return, you better make sure you don't cause me any trouble, got it?"

Y/n: "All right, deal."

Mammon: "Good, that's what I want to hear As long as you do as I say, we won't have any problems. Just don't forget which one of us is the boss here."

Lucifer: "We have decided who will take care of you, so on to the next subject your tasks."

Y/n: "Will we get tests?"

Lucifer: "Good question... Your task is to polish up your soul nicely and to acquire the power to resist demons."

Y/n: "My soul?"

Lucifer: "Demons like humans with nice souls. Let me put it this way. Nice souls look like shiny jewels. Do you understand now? Demons will use their wisdom and abilities to tempt humans so they can get heir hands on their souls. Other demons at RAD also have tasks assigned to them just like you two. In other words, either human will be tempted by demons, or demons will lose against the shiny and noble soul of a human and make a run for it. You could say it is an experiment to find out who will win."

Y/n: "What happens if I lose?"

Lucifer: "There is no penalty set. Would you like me to think of one? There, there, don't give me that look. Don't take it so seriously. You won't have to o those tasks on your own. After all, you don't have any magic in you, unlike the other exchange student from the human world..."

Y/n smiles at him.

Y/n: "You just watched me smack your brother across the room."

Lucifer: "...so my brothers and I will lend our power to you too. To see is to believe, so why don't you go ahead and give those tasks a try?"