Perhaps in the fanfiction, an ancient prophecy in both universes predicts the union of a powerful ninja and a strong Jedi. Naruto and Aayla are the ones who fit the prophecy. At first, they don't believe it, but as they get to know each other, they start to fall in love. Their marriage preparations are disrupted by an evil force that wants to prevent the prophecy from coming true. So, Naruto and Aayla have to fight this evil while also planning their wedding and dealing with the cultural differences between their two worlds.
One plot idea could be that a mysterious portal opens between the Naruto universe and the Star Wars universe. Naruto and Aayla meet through this portal. They initially have misunderstandings but gradually learn about each other. As they fall in love, they decide to get married. However, there are forces on both sides that oppose their union. They have to fight against these odds to have their wedding and prove that their love can bridge the gap between two different universes.