In the fanfiction, it could be that Naruto was exposed to a unique form of chakra that mutated his own. This new chakra allowed him to access the power of Amaterasu. Another possibility is that he made a pact with some sort of spirit or demon that bestowed upon him the ability to use this powerful jutsu. It could also be that there was a mix - up in some sort of chakra - based experiment that accidentally gave him the power to use Amaterasu.
One origin could be that Naruto has a hidden bloodline connection that was previously unknown. This bloodline could be related to the Uchiha in some way, allowing him to use Amaterasu. Or it could be a result of his journey to a mysterious place. In this place, he learned the secrets of the black flames. Maybe he found a scroll or a mentor who taught him how to harness the power of Amaterasu. It could also be due to some kind of cosmic event that altered his chakra and enabled him to use this powerful jutsu.
One implication is that he becomes extremely powerful. He can easily defeat most opponents as he has a wide range of abilities at his disposal. For example, he can use the ice - based kekkei genkai to freeze enemies and then use a fire - based one to create steam and confusion.
The plot might center around Naruto learning about the true nature of Amaterasu. In the fanfiction world, it could be that Amaterasu has some unforeseen connection to Naruto's past or his family. He could start a journey to understand this link, and during this journey, he meets new characters and faces various challenges. And of course, there could be some action - packed battles where Naruto has to use his wits against the power of Amaterasu.
Well, perhaps in the fanfiction, Naruto is in a spiritual realm and meets Amaterasu there. Amaterasu could be in trouble, her powers waning due to some dark magic. Naruto, with his never - give - up attitude, decides to help her. He uses his shadow clones to search for the source of the problem while Amaterasu shares some of her ancient wisdom with him. In the end, Naruto manages to restore Amaterasu's power and in return, she bestows upon him a new type of chakra that gives him an edge in his battles back in the real world.
One possible plot could be that Naruto discovers a hidden realm where Amaterasu exists. They meet, and over time, they develop feelings for each other. Naruto, with his kind heart and determination, wins over Amaterasu. And then they decide to get married, uniting the ninja world with the divine realm in some way.
In a 'Naruto husband of Amaterasu' fanfiction, it could be about a new era in the Naruto universe. Naruto, being married to Amaterasu, might bring about changes in the way humans and gods interact. The story could explore how Naruto tries to bring peace between the two realms. He could use his experience as a ninja and his understanding of human emotions to bridge the gap between mortals and the divine. It could also involve political intrigue as other characters might oppose their union, fearing the power that Naruto and Amaterasu could have together. And there could be a lot of action and adventure as they fight against those who oppose them.
The fanfiction might revolve around Naruto being blessed by Amaterasu during a crucial battle. This sudden blessing turns the tide of the fight. His friends and allies are initially shocked but then realize that this could be a sign of something greater. Naruto then has to learn to control this power quickly, and he might face some internal struggles as the power has its own will. He may also have to face those who are jealous or afraid of his new power.
Well, in this fanfiction, Naruto's origin as the son of Amaterasu could lead to a story where he is initially shunned by some in the DxD world because of his strange powers. But as he proves himself in battles and shows his kind heart, he starts to gain allies. His journey could also be about uncovering the secrets of his mother Amaterasu and how that relates to the overall balance of power in the DxD universe. Maybe he has to face an ancient evil that only his combined ninja and divine powers can defeat.
One possible plot idea could be that Naruto discovers the power of Amaterasu and is intrigued by it. He might try to learn more about it, perhaps seeking out the Uchiha clan members or ancient scrolls. This could lead to him facing challenges as not everyone might be willing to share the secrets of Amaterasu with an outsider like him.
Well, one possibility could be that Naruto has extraordinary powers due to his divine heritage. He might be able to control both the fire of Amaterasu in a unique way and also possess some of Zeus' lightning or godly strength. Maybe he has to face enemies who are threatened by his existence and his combined powers make him a target. He could also struggle with his identity, being part of two very different mythologies.
If Naruto can open portals in fanfiction, it could change the entire dynamics of the Naruto universe. He could travel to different hidden villages in an instant, which would enhance diplomatic relations. Also, he might be able to access secret or forbidden places that were previously unreachable, leading to new storylines and discoveries. For example, he could find long - lost jutsu or treasures in these new places. Moreover, his enemies would have to come up with new strategies to deal with his portal - opening ability as it gives him a great element of surprise.