It could start with them being friends for a long time. Oga always had a soft spot for Aoi, but was too shy to show it. One day, they were at a school event, like a dance. Aoi looked so beautiful that Oga couldn't resist the urge anymore and kissed her.
One possible scenario could be that Oga and Aoi's kiss was a moment of sudden realization of their feelings for each other. Maybe they were in a beautiful garden, surrounded by blooming flowers. The sun was setting, casting a warm glow. Oga, who had been secretly in love with Aoi for a long time, finally mustered the courage to lean in and kiss her. Aoi, initially surprised, then melted into the kiss, feeling all the unspoken emotions between them.
Maybe they are part of a group on an adventure. As they face various challenges together, they grow closer and closer. One night, while looking at the stars and sharing their dreams, they are overcome with emotion and kiss. This kind of slow - build - up plot is quite common in fanfiction.
Maybe they start as friends who gradually realize their feelings for each other. They could have been through some adventures together, sharing close calls and relying on one another, which slowly builds the attraction until it finally results in a kiss.
Maybe Naruko saves Hinata from a dangerous situation. For example, from some powerful enemy during a battle. Hinata, feeling extremely grateful and also realizing her deeper feelings for Naruko, might then share a kiss with her.
One popular story could be about Oga and Aoi going on an adventure together in a magical world. They might face challenges and learn to rely on each other.
One plot could be that TK gets injured while protecting Kari from a powerful Digimon. As Kari tends to his wounds, she realizes how much he means to her and leans in for a kiss. It's a moment of vulnerability and realization of deep - seated feelings.
It could be that Hilary gets kidnapped by a rival Beyblade group who wants to use her to get to Tyson. Tyson, of course, goes to rescue her. After a long and difficult battle, he finally saves her. In the aftermath of the rescue, with all the emotions running high, Tyson and Hilary share a passionate kiss as they realize how much they mean to each other.
It could be that a dark magic has spread in the world of Shimmer and Shine. Leah and Zac are the only ones who can stop it. They embark on a dangerous journey. During this journey, they protect each other from all kinds of threats. As they get closer to defeating the dark magic, the sense of accomplishment and the fact that they've come so far together makes them kiss. It's a kiss that symbolizes their victory over the dark forces as well as their newfound love for each other.
It could be that Luchia has to leave the human world for some reason, and Kaito realizes he can't let her go. So he makes a grand gesture to show his love. He might find a way to enter the mermaid world and in front of all the mermaids, declare his love for Luchia and then they kiss. This would be a very dramatic and emotional plot leading to the kiss.
It could be a dangerous situation. For instance, Mikan might be in harm's way, and Natsume, out of his deep love and protectiveness for her, saves her at the last moment. In the heat of the moment, with all the adrenaline and emotions running high, they share a kiss.