Sakura might blush a bit and scold him for being so carefree. She's always been a bit more proper, so Naruto's shirt - off moment could catch her off - guard.
It could be a story where Percy takes his shirt off during a training session. Maybe he's getting ready for a really intense sparring match and removing his shirt is part of his pre - fight ritual to show his determination and focus.
It might be that Naruto has found a new power or ability that makes the prosthetic unnecessary. For example, he could have developed a new form of chakra control that allows him to function without it. Also, perhaps he is about to engage in a fight where the prosthetic would be a hindrance rather than a help, like if he needs to be more agile and the prosthetic is weighing him down.
One possible scenario could be that Naruto is about to engage in a tough training session. He takes his shirt off to feel more unrestricted and ready to push his limits. It shows his determination and eagerness to become stronger.
His friends might be concerned at first. They could think he's in some kind of trouble or that he's given up. But once they understand his reasons, it could strengthen their bond as they support his decision.
One possible scenario could be that Percy got injured and Annabeth needs to tend to his wounds on his torso, so she takes his shirt off. For example, he might have been scratched by a monster during a battle, and she has to clean and bandage the wound quickly.
Annabeth could be one of the main characters interacting with him. She might tease him about taking his shirt off, or she could be concerned if he's taking it off because of an injury. Their relationship is complex, and this situation could add a new layer to it.
When Naruto takes off his weights in fanfiction, it could completely revolutionize his training. He might find that he can now train with stronger opponents, like the elite jounin or even the Hokage. This would expose him to different fighting styles and strategies, which in turn would help him grow as a ninja. Also, his physical training could now include more acrobatic and aerial maneuvers that were previously difficult with the weights on. His chakra control might also be affected, as the change in his body's movement could require different levels of chakra distribution. This could lead to him exploring new ways of using his chakra in combat and non - combat situations.
He could suddenly become extremely fast and startle his friends. Maybe he zooms around the village, leaving a trail of dust, and his friends are left in awe of his newfound speed.