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My headcanon is that May's inconsistent boob size is due to her changing her underwear daily, bra included, and that in her emerald outfit, she was just wearing a sports bra that compressed them. You'd be surprised how much boob and athletic bra can hold tight.
I was autistic and try to rationalize things like this when rules of reality don't apply. I need to make sense of things. That, and it can change from scene to scene.