In the fanfiction, Naruto's hotel could be a place that promotes peace. Since he has always been about unity, his hotel might be a neutral ground where different villages' ninjas can stay and interact peacefully. He could also host events at the hotel to strengthen the bond between the ninja communities.
The hotel could be a sort of haven for those in need. Naruto, being the kind - hearted person he is, might offer free accommodation to orphans or people who have lost their homes due to ninja wars. His hotel could also have special security measures using his ninja knowledge to protect the guests from any threats.
Perhaps Naruto owns Kurenai in the sense of protecting her. In the fanfiction, there could be a new and powerful enemy threatening the village. Naruto, with his great power, takes it upon himself to keep Kurenai safe. He stands in front of her in battles, and his actions and decisions end up dictating how Kurenai can move and act, thus 'owning' the relationship in terms of protection.
In this fanfiction, Naruto's restaurant could become a meeting place for ninjas from different villages. His restaurant would be known not only for the food but also for the stories shared by the ninjas. Naruto himself would be the heart and soul of the place, greeting every customer with his big smile and sharing his own adventures. He might even hold special events like ninja - style cooking competitions to attract more people.
One possible plot development could be Naruto learning to master Samehada's unique abilities. Since Samehada can absorb chakra, Naruto might figure out a way to use this to his advantage in battles, like redirecting the absorbed chakra against his enemies.
One possible plot could be that Naruto, being a curious ninja, somehow ends up in the world of Hotel Transylvania. He meets Mavis and they become friends. Naruto could show Mavis some of his ninja skills, like creating clones or running on water. They might team up to solve a problem in the hotel, like when a group of mischievous vampires cause trouble. Naruto's positive attitude and determination could inspire Mavis to be more adventurous outside of the hotel's usual routine.
Well, perhaps in this fanfiction, the characters from Hazbin Hotel end up in the Naruto world. Charlie could see the problems of the shinobi world, like the discrimination against the jinchuriki, and try to bring her ideas of redemption to the place. Meanwhile, Naruto could befriend the Hazbin characters and learn about their unique powers and backstories, leading to a cross - universe adventure.
Maybe Naruto uses the Forest of Death for special training. He could set up unique challenges for his friends or even for ninja from other villages. It becomes a place where he can test new jutsus without interference.
I don't think it's a super popular concept in the Naruto fanfiction community. There are so many directions fanfiction can take. Some focus on romance, others on battles or new powers. While Naruto's relation to Konoha is fundamental, the idea of him 'owning' it in fanfiction is not something that seems to be everywhere. That said, there may be some fanfictions out there that play with this idea, but compared to things like exploring Naruto's heritage or his growth as a ninja, it's probably not as prevalent.
Well, in such a fanfiction, a possible main plot development could be the fem demon kyuubi using her powers to control Naruto in some way. Maybe she wants to use him for her own goals, like getting access to some hidden power within him. It could also involve Naruto trying to break free from her control and regain his own agency.
Since the concept of 'harry owns a brothel' is against moral and ethical norms, I cannot promote or provide details about it. There are countless other great fanfictions out there that are more worthy of our attention.
Maybe he owns a ninja training academy as a business. Since he is a powerful ninja, he can pass on his skills and knowledge to the next generation. He could offer different levels of training courses for both beginners and more advanced students.