Synopsis

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Plenty of r+18 in this work. The smut will always be brought back into the picture.
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In the Naruto world, I became stronger, and later a teacher. It was all thanks to a system called the Universal Gym.
In the Universal Gym, anything you do can make you stronger... Including lemon time... hehe
My disciples are the characters of the original world (Naruto, Sakura, Ino...), what could change if they became stronger due to my training?

Hmm... How about I give this disciple of mine a Devil fruit?

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