Perhaps a near - death experience where Odd saves Aelita or vice versa. This would create a strong emotional connection between them. After that, they would be more protective of each other and their relationship would grow into a more intimate friendship or even something more romantic over time.
One idea could be that Odd and Aelita are on a secret mission together in a parallel dimension. They face strange creatures and have to rely on each other's unique skills to survive. For example, Odd's cat-like agility and Aelita's ability to manipulate digital landscapes.
In many fanfictions, their relationship starts from friendship. They are comrades in the fight against XANA, and gradually they start to notice each other in a different way. Little by little, they realize their feelings are more than just friendship.
Their relationship can be developed through shared experiences. For instance, when they fight side by side against a common enemy. This would create a bond of trust and mutual respect between them.
To develop their relationship, you could show them in normal, everyday situations. Like them having coffee together and just talking about their dreams and fears. This would humanize them and make their relationship more relatable. Also, having them save each other's lives in different scenarios would strengthen their bond. Maybe Spiderman saves Gwen from a falling building one time, and then Gwen saves him from a dangerous chemical spill another time. And then there could be moments of jealousy when another character shows interest in either of them, which would make them realize their true feelings for each other.
Their relationship can be developed by having them train together. Naruto can share his experiences and wisdom gained from his own training and battles. Konohamaru can then look up to Naruto even more and try to implement those teachings in his own ninja way.
Their relationship can be developed through shared adventures. For example, going on quests where they rely on each other's skills. Rex might need Mythra's combat abilities and Mythra could need Rex's determination and kindness.
To develop their relationship, you could explore their past. Maybe there were times when they first fused into Garnet and had doubts about each other. By delving into these memories and how they overcame them, it can strengthen their relationship in the fanfic. Also, having them face new challenges together, like dealing with a new type of gem enemy, and seeing how they support each other through it.
Their relationship can be developed through shared experiences. For instance, if they get caught in a rainstorm together and have to find shelter. During this time, they start talking and realize they have more in common than they thought. It could also be developed through competition. They enter a local contest, and at first, they are rivals but then they see how the other person is also trying hard and start to respect each other.
Their relationship can be developed through shared experiences. For example, when they encounter a difficult Pokémon battle together, Pikachu can protect Lillie, and Lillie can in turn use her skills to support Pikachu. This mutual reliance will strengthen their bond.
Yes, there are some out there. You can try searching on fanfiction websites like FanFiction.net or Archive of Our Own. Just type in 'odd and aelita kiss' in the search bar, and you might find some interesting stories that explore their relationship and that special moment of a kiss.