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This is amazing, Nice headcanon!
Little HC: When Primis (2.0) Edward Richtofen blushes, it’s this splotchy red mess that looks a little odd. It travels from high on his cheeks, all the way down his neck, to settle on his shoulders. The fact that he’s much paler than the others (and a lot of the time, his surroundings too) only serves to exaggerate it. Nothing gets him to blush quicker than lewd science jokes, even if he’s the one telling them.