One interesting plot could be a time - travel related one. Vegeta and Bulma accidentally get sent to the past. There, they have to deal with the different versions of their friends and enemies. They also have to find a way to get back to their own time while not disrupting the timeline too much. This would be full of adventure and also explore their relationship in a different historical context.
The plot could be about Bulma getting kidnapped by a new villain. Vegeta goes on a rampage to find her. He battles through hordes of minions until he finally reaches the villain's lair. There, he has an epic battle and rescues Bulma. Afterward, he realizes how much he truly loves her and vows to protect her better.
One possible fanfiction could be about Vegeta's attempts to balance his training with family life. He might struggle to find time for Bulma and their family while also trying to keep up with the threats in the Dragon Ball Super universe. For example, he could be training for a new powerful enemy, but Bulma wants him to be more present at home. So he has to find a way to make both work.
One great fanfiction idea could be that Vegeta takes Bulma on a special training trip. He wants to show her the different planets he has trained on. This would be a unique adventure for them both, allowing Bulma to see the vastness of the universe Vegeta has experienced. It would also strengthen their relationship as they face various challenges together during the journey.
One interesting fanfiction could be about Vegeta's struggle to adapt to family life with Bulma while still being a Saiyan warrior. Maybe he tries to teach Trunks Saiyan traditions in a world that's mostly human.
One interesting storyline could be about Vegeta trying to be a better father to Trunks in a fanfic. He might struggle with his Saiyan nature while also wanting to show love and support like a human father. Another could be a time - travel fanfic where Bulma uses her genius to create a time machine again, and Vegeta goes back in time with her for some reason, like to prevent a future threat from ever happening. And there could also be a fanfic where Vegeta and Bulma have an adventure in a new, uncharted part of the Dragon Ball universe, facing new enemies and discovering new powers together.
One interesting fanfiction could be about Bulma and Vegeta going on a secret adventure together. Maybe they discover a new planet and have to work together to survive. Another could be a story where they deal with family issues related to their son Trunks in a very different way than in the original series.
One possible scenario could be Goku and Bulma going on a quest together to find a new type of Dragon Ball that has unique powers. They might face various challenges along the way, like dealing with new villains who also want the Dragon Ball. Bulma could use her intelligence to outwit the enemies while Goku uses his strength to fight them off when necessary.
A possible plot twist could be that Vegeta is actually an impostor. The real Vegeta has been trapped in another realm, and this impostor has been living with Bulma and the others. As Bulma starts to notice some strange behavior, she investigates and discovers the truth. Then she has to find a way to rescue the real Vegeta.
In a Dragon Ball GT fanfiction about Bulma and Vegeta, perhaps Bulma discovers a way to temporarily give herself ki powers. She decides to train with Vegeta to become stronger. At first, Vegeta is skeptical and a bit dismissive, but as he sees Bulma's determination, he starts to train her seriously. During their training sessions, they grow closer and learn more about each other. Eventually, Bulma becomes strong enough to help Vegeta in a battle against a powerful enemy that neither of them could have faced alone.
Yes, I recommend Dragon Ball Super: Endless Dimensional Chaos and Lazy Dragon Ball. Both novels have plots involving Vegeta and Bulma. I hope you like this fairy's recommendation. Muah ~😗