I'm not sure specifically as there could be many different 'naruto lean on me fanfic' stories out there. But it might involve Naruto characters relying on each other in various difficult situations, like during a tough battle or in times of emotional distress.
Since it's a fanfic, it could vary. But most likely Naruto would be one of the main characters, as the title has 'naruto' in it. There could also be Sasuke, as he has a complex relationship with Naruto in the original series. Sakura might also be involved as she is part of their team.
In fanfic, Naruto might be made to use the lean fighting style in several ways. Maybe he could incorporate its quick, evasive maneuvers into his ninja combat. For example, the lean fighting style's emphasis on using the body's momentum to dodge attacks could be adapted by Naruto, who is already very agile as a ninja. He could use it to quickly shift his body weight and avoid enemy jutsu or physical strikes.
He might gain a new level of physical control. The lean fighting style requires precise body movements. Naruto, by adapting it, would likely improve his overall body coordination. This could lead to him being able to perform his existing ninja techniques with more accuracy and power. For instance, his Rasengan might become even more devastating as he can position his body better to deliver it. Also, his character could become more self - assured in his fighting abilities as he masters this new style, which in turn could affect his relationships with other characters in the fanfic. They might see him as an even more formidable opponent or a more reliable ally.