Help! I'm Trapped in Naruto's Body and Become a Grandpa

[Naruto fanfic, system flow, the mastermind behind the scenes, development, making up for regrets] It was sent just after time travel, and it was still trapped in the Nine-Tails seal in Naruto's belly. The beginning was a collapse of heaven! Seeing that Kyuubi is about to go berserk and Naruto is about to turn dark, we both have to finish it! At a critical moment, my soul awakened and transformed into a mysterious grandpa! "Boy, do you want to learn real ninjutsu? Do you want those who look down on you to crawl at your feet?" "Become your master to me, and I will make you the top of the ninja world!" Facing my temptation, the hungry Naruto cried: "Grandpa, I just want to eat a bowl of ramen..." I laughed, and with my backhand, I created a mountain of ramen noodles in the seal for him! Since then, the ninja world has had a sinister savior. Three Body Technique? I used programming thinking to teach him how to do it quickly in one day! Rasengan? I gave him three days to master fluid mechanics! Physical skills? He can dodge attacks while calculating his opponent's physical consumption! When Naruto stepped on Pain's face and asked him "How much does rice weigh?", The entire ninja world went numb! And I, hiding in the deepest part of the seal, looked at the Naruto world that I had single-handedly led to a new ending, and showed a happy smile. "Naruto, it's time to harvest the final fruits and rebuild your body for your master!"