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I love how in just about any Ace and Sabo reunion fic/fanart/fancomic that I've seen of those two reuniting that Ace will 100% punch Sabo no hesitation. It's pretty much Canon at this point. Like- all of Ace's suppressed childhood gremlin anger WILL be unleashed the moment he lays eyes on the blonde bastard who showed him how to love and care and be loved and cared for.