Author's Note: I do not own One Piece. Young Luffy, Sabo, and Ace. This is written for the FanFiction High-School Never Ends - big challenge.
Luffy ran down the stairs as quickly as he could, beginning an impressive, running leap when he began to reach the bottom. In his hands, he had a foam sword that he had managed to talk Makino into buying for him. He headed through the air, directly towards the wall, swinging his foam sword the entire time.
Ace and Sabo were sitting in the other room, when they heard something smash into the wall, but not going through it. Ace and Sabo went running to see what the hell had just happened. Ace was the first one to make it over to Luffy, who was on the ground by the wall, hitting it with his foam sword. Ace stared at the mess that was his brother, "What the fuck do you think you are doing?!"
Luffy turned to face him, grinning the entire time, "I'm a outlaw that fights with swords! And that is my enemy!" Luffy gestured at the wall, when he spoke the last line, still gripping the foam sword.
Sabo had joined the other two boys, looking just as confused as Ace. Ace sighed, "It looks like the wall is winning." Luffy had a huge bump on his head from his collision with the wall, which didn't even faze him due to his being made of rubber.
Luffy gave Ace and Sabo his most vicious look, "Bow down to your master!"
Sabo couldn't come up with a response to Luffy, but Ace wasn't one to get controlled. Ace walked over to Luffy, and punched him, "Who's the master now?!"
Sabo sighed at Ace's lack of patience with their brother's games, while Luffy was on the ground, trying not to cry, still trying to get them to fully accept him as one of them, and Ace was still standing over him. Some things would never calm down, their sibling rivalry for control being one of them.