Well, he might discover her deepest fears. For example, she could be secretly afraid that he'll leave her for his Saiyan warrior ways. It could also lead to some comical situations. Maybe she's thinking about how silly he looks when he does a certain Saiyan ritual and he reads that thought and gets all grumpy.
One type of plot could be that Vegeta reads Bulma's mind and finds out she's in danger. She might be thinking about a threat that she's not told him about yet. This would then lead to Vegeta going on a mission to protect her. Another plot could be that he reads her mind and realizes she's not happy with his recent behavior. So he has to figure out how to make it up to her.
In the fanfiction, their relationship is full of passion. It's not just a physical passion but also an emotional one. Vegeta, who was once a cold - hearted Saiyan, has softened because of Bulma. He shows his love in his own way, like training hard to protect her. Bulma, in turn, is attracted to Vegeta's strength and his gradual transformation into a more caring person. They bicker sometimes, like any couple, but it's all part of their unique dynamic.
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.
Often, Vegeta becomes more in touch with his emotions. He starts to care about things other than just fighting, like his family with Bulma. He may show more love and protectiveness towards her and their child.
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.
One challenge could be protecting the baby from their enemies. Vegeta has made many foes over the years, and they might target the baby. Also, Vegeta's Saiyan nature might make him push the baby too hard in training, while Bulma wants a more relaxed approach. This difference in parenting styles could cause some friction between them.
In DBZ Vegeta and Bulma fanfiction, there can be alternate universes explored. Maybe in one universe, they meet under different circumstances. For instance, instead of Vegeta coming to Earth as an enemy, he could be an ally from the start. This would completely change the dynamics of their relationship. It could lead to a more romantic and less combative start to their relationship, and the fanfiction could explore how this different beginning affects their future together.
Another reaction could be that Bulma tries to communicate with Vegeta. She would sit him down and try to talk about how his actions are making her feel. However, if Vegeta is unresponsive or dismissive, it would only add to her heartbreak.
In fanfiction, their love story could be full of twists and turns. Maybe at first, Vegeta is oblivious to Bulma's feelings. He is so focused on training and becoming stronger. But as Bulma continues to show her care and affection, he starts to open up to her. Their love could be a journey of self - discovery for both of them.