I think it would be funny if sometimes the brothers exaggerated Mc’s humanness as an excuse to not do certain things, maybe it’s mainly mammon who does it but sometimes the others join in. Saying crap like
Mammon: No can do, we need to go water our human,
Satan: humans need to drink 8 cups of water a day.
Belphie: And our human is to stupid to remember to drink 1 cup.
Mammon: exactly! We don’t want our human to DIE from dehydration.
when Mc finds out they’ve been doing this, mammon, beel, levi and mc had been caught outside of class, when confronted mammon shushes the person and beel wraps his arms around Mc’s head, covering their eyes and ears,
Mammon: the human has a migraine! Keep your voice down!
Levi: BECAUSE. If humans heads start to hurt to much they explode!
Mammon: so we’re escorting them to the infirmary!
Demon:… do you guys have a hall pass?
Mammon: the great mammon doesn’t need a hall pass! And there’s no time for that! This is an emergency!
Once the demon leaves Mc is confused and speaks up,
Mc: guys who told you that..?? My head isn’t going to explode? Even though it feels like it is..
Mammon: oh eh- don’t worry about it,
Levi: we just say stuff like that to avoid situations lol,
Mc: …. I’m just gonna pretend you guys don’t do that.