After Kurama's death, Naruto faced new challenges. His chakra reserves were reduced, but he continued to guide and inspire the younger generation of ninjas. He also had to adapt his fighting strategies without Kurama's immense power.
The story would likely be filled with chaos. The Hidden Leaf would be in shock and mourning. Boruto would probably become an outcast. He might be hunted by those loyal to Naruto. People like Sasuke would surely seek revenge. Boruto would then either have to flee or try to prove his innocence if he was framed or explain his actions if he had a reason.
Physically, Naruto can use his Rasengan or other powerful jutsus to fend off enemies attacking Boruto. His combat skills are top - notch, and he won't hesitate to engage in battle to keep Boruto safe.
After Naruto was completed, there was no official announcement of Naruto's follow-up serial plan other than the movie version of Bo Ren Chuan. Although the movie version of Bo Ren Chuan told the story of Naruto after the end, it was only a fictional story and had nothing to do with the original Naruto.
Naruto's original manga, which was created by Kishimoto Masashi, had been completed. Although there were some remakes of Naruto, such as Naruto Shimbun and Naruto SD Gundam, these works were not directly related to the original Naruto.
At present, the officials had not announced the follow-up plan of Naruto, so it was uncertain whether there would be new Naruto works. If you want to know more specific information, it is recommended to pay attention to the relevant official channels or media notifications.
In the 'boruto kills naruto fanfiction', a motive could be a power struggle. Boruto might believe that Naruto's power is holding back the village's growth or his own potential. He could think that by eliminating Naruto, he can bring about a new era of power in the Hidden Leaf. Also, it could be out of desperation. If Boruto is in a situation where he believes that killing Naruto is the only way to save someone he loves, like his mother or a friend, he might take such a drastic step.
Maybe it's the high expectations that Naruto has for Boruto. Naruto is a hero, and he might unknowingly put a lot of pressure on Boruto to follow in his footsteps. Boruto could be scared of not being able to meet those expectations.
They could start by having an honest conversation. Naruto could sit down with Boruto and just listen to his fears without judgment. This would be a first step in building a better relationship.
As of now, no. In the Boruto series, their relationship is mainly focused on their friendship and comradeship as ninja. There are some moments that fans might interpret as having a hint of something more, but the story has not made their relationship a romantic one in an official capacity.