If the sister has caused problems for Yuma in the fanfiction, she could make amends. For example, if she broke his card, she could find a way to replace it or help him get a more powerful card. This act of kindness might make Yuma change his feelings towards her.
A shared experience could also help. They could team up to face a common enemy in the dueling world. Working together towards a goal might make Yuma see his sister in a new light and realize that they can support each other, thus resolving his hatred towards her.
In the fanfiction, there could be a misunderstanding between Yuma and his sister. Perhaps she was trying to protect Yuma in a way he didn't understand. She might have stopped him from taking part in a dangerous duel, but Yuma, being passionate about dueling, misinterpreted her actions as trying to hold him back and thus hated her.
First, focus on their unique relationship. Astral is an otherworldly being and Yuma is a passionate duelist. Show how they learn from each other. For example, Yuma can teach Astral about human emotions, while Astral can teach Yuma advanced dueling strategies. Second, create exciting duels. Describe the cards in detail, the strategies used, and the tense moments during the duel. Third, introduce new elements like a mysterious new card set or a hidden dueling technique.
Well, in some fanfictions, their kiss might be a more impulsive act. For example, Yuma could be trying to prove a point to someone else, like a rival who doubts his feelings for Tori. So, he just goes for it and kisses her right there, which then leads to a whole new set of emotions and relationship developments for them both.
One possible fanfiction could involve Yuma being kidnapped by an unknown group who are after his powerful Xyz Monsters. They might hold him captive in an abandoned warehouse and try to force him to give up his deck. But Yuma, being the brave duelist he is, uses his wits and the bond with his Astral to find a way to escape and turn the tables on his captors.
One possible fanfiction could be about Yuma and Dark Mist forming an unexpected alliance. Maybe Dark Mist has some hidden motives that initially seem malicious but as the story progresses, it turns out he's actually trying to protect Yuma from a greater evil in the Zexal world.
A simple plot could be that Yuma and Tori are exploring an ancient temple together. As they are about to be attacked by some sort of trap, Yuma quickly kisses Tori, believing it might be his last chance. This kiss then gives them a sudden burst of energy or a new power that allows them to escape the danger.
They could start as childhood friends who slowly fall in love. For instance, as they grow up in Heartland City, they share many experiences like going to school together and learning about dueling. One day, Yuma might get into a really tough duel and is on the verge of losing. Tori's unwavering belief in him gives him the strength to turn the duel around. This moment could be the spark that makes them realize their love for each other.
One possible fanfiction could be that Yuma and Tori start off as friends. As they go on more adventures in the Yu - Gi - Oh Zexal world, they gradually realize their feelings for each other. For example, during a tough duel, Tori's words of encouragement make Yuma see her in a new light. They might then have some sweet moments together, like sharing a meal after a victory and realizing that their bond is more than just friendship.
In a fanfiction, they could participate in a grand tournament. But this tournament has a twist. It's not just about winning duels but also about solving puzzles and riddles related to the history of dueling. Astral's vast knowledge and Yuma's intuition would work together. They would face opponents who are not only strong duelists but also cunning strategists. Along the way, they might also discover a new form of dueling that could change the future of dueling in their world.
Maybe the reason for Yuma's kidnapping is not what it seems at first. Instead of being for his dueling abilities, it's because he has a hidden power that he's not even aware of. This power could be the key to saving or destroying the world of Zexal, and the kidnappers want to control it.