I live for the idea of MC and Mammon just doing dumb best friend stuff
Something funny happens in class, and literally all MC has to do is look at Mammon and he just bursts out laughing and gets in trouble
MC just takes off running down the hall so Mammon starts running too, and now they're both just running as fast as they can and fucking cackling for no reason until one of them almost slips and now neither of them can breathe because they're laughing so hard-
MC sitting in a shopping cart while Mammon keeps handing them things to add to the ever growing pile that's slowly burying them alive
MC and Mammon locking eyes at the dinner table, and now they're having a staring contest while everyone else is wondering what the hell is going on
MC: Right, Mammon?
Mammon, who doesn't know what the fuck is happening: Yeah
Mammon and MC having their picnic ruined because a wasp comes a little too close and they both immediately got up to run
Sitting in silence on the couch, legs draped over one another while they scroll through their phones and show each other stupid videos and memes
MC dares Mammon to jump as high as he can on his bed and he promptly breaks the frame, so now they have to explain to Lucifer what happened
Pointing to an ugly creature/monster in a movie and saying "that's you"
Mammon showing MC a picture of Lucifer's face zoomed in REALLY close and trying his damndest not to laugh because "SHH LUCIFER IS RIGHT THERE SHH-"
imagine the brothers panicking over lucifer suddenly going on a rampage and diavolo having to step in just to stop him from killing you and when they ask you what got him so mad it was all because of this