Sure. Many fanfic writers like to delve into the relationships between characters. Chi Chi and Bulma have a long history in the Dragon Ball universe. A fanfic about their friendship might show how they support each other, deal with the crazy adventures their male counterparts get into, and bond over their own unique strengths and weaknesses. For example, Chi Chi's strong - willed nature and Bulma's intelligence could make for a great combination in a story about their friendship.
Honestly, I haven't come across a fanfic that specifically features Bulma, this 'have him' idea, Chi - Chi and Vegito in a great way that I could recommend. However, when exploring fanfic sites, pay attention to the tags. If a fanfic is tagged with all or most of these characters, it's more likely to be relevant. Also, look for writers who are known for their well - written Dragon Ball fanfics. Sometimes they might not have exactly what you're looking for, but their writing style could still be enjoyable and they might create something similar in the future.
One possible plot could be that Bulma might be jealous of the relationship Goku and Chi - Chi have. Maybe she sees how much Goku has changed since being with Chi - Chi and she misses the old, carefree Goku. So, she tries to create misunderstandings between them by, for example, making it seem like Goku is more interested in training with her than spending time with Chi - Chi.
Chi - Chi would likely be very hurt at first. But then she would get angry and start thinking of ways to prove to Goku that their relationship is strong. She might cook his favorite meals and remind him of all the good times they've had together, while also giving Bulma a piece of her mind.
In some fanfictions, Goku and Chi - Chi's first kiss might happen after a big battle. Goku realizes his deep feelings for Chi - Chi. He looks at her, and there's a moment of silence. Then, without a word, he just leans in and kisses her gently. It's a simple yet very emotional moment.
One way is that it's a very hesitant kiss. Goku, being naive about love, is unsure but Chi - Chi initiates it, and it's described as a soft, brief touch of lips. Another description could be that it's a spontaneous kiss. They are in the middle of an argument about Goku's training, and suddenly, in the heat of the moment, Goku kisses Chi - Chi to stop her from being angry. It's a bit clumsy but full of raw emotion.
Similar novels to Delays were recommended, such as Book of Troubled Times, Spiritual Realm Walker, Tang's Table, King of Imperial Beasts, and Fairy, Please Listen to My Explanation.
A mentorship relationship could be explored. Bulma, with her knowledge of technology and the world outside of martial arts, could mentor Chi Chi in certain areas. For example, teaching her about new inventions or different cultures. Chi Chi, in turn, could teach Bulma about discipline and family values.
Goku would probably be really confused. He loves Chi - Chi and their family, and he might not understand why Bulma would want to break them up. He might just tell Bulma straight that he's happy with his life as it is. Chi - Chi, on the other hand, would be furious. She's very protective of her family and her relationship with Goku, and she'd likely give Bulma a piece of her mind.