In fanfiction, their getting together can be due to Vegeta's growth as a character. As he becomes more accustomed to life on Earth, he realizes that Bulma is an important part of his new life. He might start off being a bit rough around the edges with her, but over time, he starts to appreciate her quirks and her role in his life. Bulma, on the other hand, is drawn to Vegeta's determination and his underlying good heart. So, this combination of character traits and the development of their relationship in the fan - created stories often leads to them getting together.
The plot of Vegeta and Bulma together appeared in Dragon Ball GT. In the Dragon Ball GT-Series, Vegeta and Bulma became a pair of lovers. They experienced many adventures together and solved many problems together. However, they did not officially get married in the manga. Instead, they chose to get along as friends.
At first, their relationship might start with a mutual respect for each other's abilities. Vegeta respects Bulma's intelligence as she is a brilliant scientist. Bulma, on the other hand, respects Vegeta's power. As time passes, they start to rely on each other more. Vegeta might rely on Bulma for technological support, and Bulma might rely on Vegeta for protection. This gradually turns into deeper feelings as they spend more time together and face challenges as a team.
There's no indication in the official story that they had adventures together in high school. Vegeta was mainly concerned with his Saiyan pride and training, and Bulma was more into her scientific pursuits on Earth.
Vegeta would likely still be his proud and strong - willed self, but with a newfound tenderness towards Bulma. He might be a bit more protective and less quick to anger. Bulma, on the other hand, would be her intelligent and sassy self, always ready to challenge Vegeta in a playful way.
Well, it all started when Vegeta was on Earth. Bulma was the first one to really interact with him in a more personal way among the Earthlings. She saw something in him that others might not have. You know, Vegeta was this super - strong Saiyan but also kind of a loner. Bulma's kindness and her own strong personality kind of broke through Vegeta's shell. And from there, little by little, they just sort of fell for each other.
It often stems from fans' imagination and their love for these characters. They might envision unique scenarios and storylines that bring Bulma and Vegeta together in different ways.
The relationship might develop gradually. Bulma could start by being attracted to Vegeta's power and mystery. As she gets closer to him, she discovers his more complex personality. Vegeta may initially resist her advances but eventually gives in to his own feelings.
In such fanfiction, Vegeta might make Bulma happy by showing his softer side. Maybe he cooks a special meal for her. Vegeta is often portrayed as tough, but when he does something out of his usual character like cooking, it can be a sweet surprise for Bulma.