admiral Luffy

Luffy was a caged bird. His wings were torn off and now he could not fly over the sea without any binding. Now he was only tied to a corrupt government that had him in their sights.
But even if he is the strongest Admiral, he will not let his little brother, Ace, be executed.
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Ace and Sabo love their Older Brother (Ace more so than Sabo), probably a lot more than they have in their current crew... It pains them when he didn't come back from Marineford for months after leaving them to heal the Fleet Admiral. They both thought their brother was dead.
And then, they suddenly saw him siding with the Marines, treating them coldly. Ace accused him as a Traitor, but his heart broke into two. Sabo is confused, his Older Brother smells different, looks different, and he knew him. He won't leave his dream, his freedom, just to serve the Marines... so what happened?
Maybe they can get help from their Captain? An Enlightenment of their Older Brother's situation and the younger brothers are determined to find a way to free their Brother from the cage he's in.