Well, it could be a story about Keith borrowing Lance's jacket by mistake. Then, Lance notices and is initially a bit annoyed but as they interact more because of the jacket situation, they start to understand each other better and become closer friends.
Obviously, Keith and Lance would be the main characters. They are the ones directly related to the concept of Keith wearing Lance's jacket. Other characters from their team or universe could also be included, like Shiro who might notice the jacket exchange and have some sort of reaction to it, or Pidge who could make some teasing comments.
One common theme is friendship. Their relationship often starts as a rivalry but gradually turns into a deep friendship in many fanfictions. For example, in stories like 'From Rivals to Allies', their journey of understanding and supporting each other is the central focus.
A lot of the fanfictions about their kiss also explore the reactions of the other characters in the Voltron team. Some might be supportive, while others could be initially shocked or confused. The kiss can also be a symbol of a new era in the team's dynamics, as Keith and Lance's relationship changes. It can lead to interesting storylines about how the team adapts to this new development.
Teamwork is also a big theme. In many fanfictions, they have to work together as part of a team and their relationship is strengthened through that. And there's the theme of sacrifice, where they might be willing to sacrifice for each other.
One common theme is friendship. Many fanfictions explore how Lance and Keith's friendship evolves over time. For example, they might start off as rivals but gradually become close friends who rely on each other.
The popularity of Keith and Lance kiss fanfiction might be due to the strong chemistry between the two characters in the original source. Their personalities are quite different yet complementary, which makes the idea of them getting closer very appealing.
In this fanfiction, perhaps Keith would be really nervous at first. He might worry about making a good impression on Lance's family. Maybe he'd bring a small but meaningful gift, like a flower from his home planet.