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thinking about little luffy being so interested in the beetles and butterflies he saw around in the woods but always frustrated bc he couldn't learn more about them. so one morning ace and sabo secretly go to a library while luffy is still sleeping to steal take some books about entomology and luffy is so so happy he hugs them so hard they can't breathe (ace complains loudly right after that but sabo can see him smiling against his shoulder when he thinks no one is watching him)