The plot could involve Naruto and Tayuya being mistaken for powerful mages in the Fairy Tail world. Since Naruto has such strong combat abilities and Tayuya has her unique skills. They get dragged into a guild - centered conflict. For example, there could be a rival guild trying to steal a powerful magic item that Naruto and Tayuya are somehow guarding or are associated with. They then have to use their combined skills, Naruto's ninjutsu and Tayuya's jutsu, along with the help of Fairy Tail mages like Natsu or Lucy to fend off the attackers.
Perhaps in this fanfiction, Naruto and Tayuya are on a quest in the Fairy Tail world. They are searching for a way back to their own world. Along the way, they meet different Fairy Tail characters. Naruto might befriend Happy and they could fly around looking for clues. Tayuya could have some interesting interactions with Erza, comparing their combat styles. And in the end, they discover that the key to going back home is related to a powerful and ancient Fairy Tail magic that they have to help protect from a dark mage who wants to use it for evil purposes.
Naruto could fit in as a new kind of mage with his chakra - based powers. His Rasengan could be seen as a super - powerful magic spell in the Fairy Tail world. Tayuya, with her music - based attacks, might be like a unique bard - mage hybrid. She could use her flute to control the flow of magic in battles. They could both join a Fairy Tail guild and go on adventures, with Naruto's determination and Tayuya's edginess adding new dynamics to the guild.
One possible plot could be that Naruto is somehow transported to a world where Saiyan powers and Fairy Tail magic exist. He might start off as an outcast, not understanding these new powers at first. But as he trains and learns, he combines his ninja skills with Saiyan strength and Fairy Tail magic to become a powerful force and fight against an evil that threatens all three aspects of this new combined world.
Well, perhaps in this fanfiction, Fairy Tail characters bully Naruto because they are jealous of the attention he gets from certain characters in their shared universe. They start by making fun of his appearance, like his orange jumpsuit, and then escalate to more mean - spirited pranks, like using their magic to disrupt his ninja training.
Well, it could be that in this fanfic, Naruto is somehow transported to the Fairy Tail universe. And due to his different power set and origin, the Fairy Tail members misunderstand him and think he's a threat. Maybe they see his shadow clone jutsu as some sort of dark magic and turn against him.
Well, perhaps in this fanfiction, Naruto is banished due to a false accusation in his world. He lands in the Fairy Tail world and is seen as an outsider. However, his determination and strong will attract the attention of some of the Fairy Tail members. Erza, for example, might see his potential and take him under her wing, training him in the ways of the Fairy Tail magic while he also teaches her some ninja tricks.
Well, it could be about Naruto arriving in the Fairy Tail world and being shocked by the magic there. He might start to learn magic and use his ninja skills in combination with it. Maybe he teams up with Natsu and they go on adventures together, fighting powerful enemies with a mix of ninjutsu and magic.
It could also be a situation where Naruto has his own motives that conflict with Fairy Tail's goals. Perhaps he discovers a power within Fairy Tail that he thinks is too dangerous and decides to take it upon himself to stop it, even if it means turning against them. He might think he's doing the right thing in the long run, but Fairy Tail sees it as a betrayal.
Maybe the plot involves Naruto having a special connection to a fox - themed magic in Fairy Tail. He teams up with some of the Fairy Tail characters, like Natsu. Together, they go on adventures where Naruto's unique ninja - fox abilities from his own world combine with Fairy Tail's magic to defeat powerful enemies. For example, Naruto could use his shadow clone jutsu in combination with a fox - fire spell from Fairy Tail.
Perhaps Naruto is on a quest to find a way back to his own world. He realizes that staying in Fairy Tail is only delaying his journey. He has a sense of loyalty to his own friends back home like Sasuke and Sakura. So he leaves Fairy Tail, even though he has made some friends there, in order to pursue his ultimate goal of returning to Konoha.
Maybe Tayuya gets tired of Orochimaru's evil ways and decides to defect. She runs into Naruto during her escape. Naruto offers her shelter in Konoha. During her stay, they start to fall in love. For example, they might train together and Naruto helps her control her sound - based jutsu better. This shared activity brings them closer.