Headcanon 12: Jean has a real sweet tooth and Marco is an amazing baker. Sometimes they bake together, but Marco often has to banish Jean from the kitchen because he keeps eating the cookie dough before they can make cookies out of it.
Sub headcanon: Jean gets up in the middle of the night to try and sneak a cookie because “Holy shit, those little circles of heaven taste better than God’s fucking tits!” but he doesn’t turn on the light and he stubs his pinky toe on the corner of the counter and breaks it. Marco wakes up from all of Jean’s curses and muffled screams and takes him to the emergency room. And on the way home Marco’s like, “That’s what you get for trying to steal my cookies at three o'clock in the morning! You little shit,”
And Jean’s like, “Can I still have a cookie?”
And he replies “…yes,”