One possible plot could be that Goten and Future Trunks meet during a time - traveling accident. They initially have some misunderstandings due to their different upbringings and experiences. But as they start to train together, they learn from each other's fighting styles and develop a deep friendship. They then team up to face a new, powerful enemy that threatens both their timelines.
The plot could also focus on their relationship. Since they are brothers but from different timelines in a way. They could bond over family stories that Goten has heard but Gohan can now give a different perspective on, like stories about their father. And they might train together to become even stronger for the future battles that Gohan foresees.
It could be a rogue Saiyan from an alternate timeline who has come to their universe to prove his supremacy. He is jealous of the power that Goten and Future Trunks possess and wants to take it for himself.
The meeting might also have an impact on the technology and knowledge in the Dragon Ball world. Maybe Gohan brings back some advanced techniques or knowledge from the future. And Goten, being young and curious, could spread this knowledge among the others. This could potentially change the way battles are fought and how they prepare for future challenges in the Dragon Ball universe.
Goten in fanfiction may have his insecurities explored, especially when compared to his older brother Gohan. He could be shown striving to prove himself. Bra might be presented as a curious character, interested in exploring the world beyond what her family has shown her. In stories, their interactions can be really interesting, like when Goten tries to protect Bra or when Bra challenges Goten to be better. It's these little nuances that make their characters come alive in fanfiction.
Many fanfictions explore the theme of power and how female Goten learns to control and master her powers. Some also touch on the theme of family, despite the differences in her gender in this fan - created version, she still has that connection to Goku and others in the family. It's really interesting to see how these themes play out in different stories.
I'm not sure specifically as I haven't read it. But it might be a fan - created story about Goten and Trunks. It could involve their adventures, friendship, or some unique situations created by the fanfic writer.
Since the term 'lemon' is associated with mature content, we should focus on the positive aspects of Gohan and Goten. They could be in a story where they train together, face new enemies, and grow stronger as Saiyans. That would be a more appropriate and exciting plot than what a 'lemon fanfic' might suggest.
In the long run, they might realize that they need to change their behavior. They could start thinking about how to make it up to Chichi. Maybe they'll go and do some nice things for her, like getting her some flowers or cleaning the house really well without being asked. This would show that they've learned their lesson and are trying to be better sons.