Well, it depends on what you consider 'good'. There are many 'Bulma kisses Vegeta' fanfictions that range from light - hearted and romantic to more serious and angsty. Some might emphasize the love that has developed between them over time, while others might focus on a specific moment in their relationship where the kiss is a turning point. You really have to dig in and read a few to find the ones that suit your taste.
Yes, there are quite a few. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Bulma kisses Vegeta' and you'll likely find a variety of stories with different takes on their relationship.
A practical answer is Chapter 255, because it turns the idea into a concrete scene. The chapter opens with Sounds pretty interesting." "I know this one!, adds pressure through Nearly a million viewers boiled over again— Holy shit, where did this..., and ends on He was wearing a dark red.
Chapter 225 is the strongest chapter-level answer because it starts from When Zhao Lang's devastatingly handsome face appeared, all six people... and follows through on Which big shot is inspecting again???] [The ID is still in the United Arab....
The best chapter pointer here is Chapter 235, "Bungee Jumping in Ethiopia???". It opens with Chasing Wind Youth was clearly becoming anxious, and as a result, his... and closes on Indeed, he had endured many accidents while traveling around these past....
Chapter 272 is the strongest chapter-level answer because it starts from Lin Manru held the phone for a few seconds, expecting her daughter... and follows through on So, they made him a temporary ID card, temporarily changing his name to....
A practical answer is Chapter 285, because it turns the idea into a concrete scene. The chapter opens with He could distinctly feel his back rubbing intimately against the ground..., adds pressure through By the fourth cycle of Reincarnation, he had calmly accepted the fact and..., and ends on.
Look to Chapter 278 for the clearest answer. It begins with People from the fan club also got word that Jiang Li was soon to return to..., keeps building through Early in the morning, as the president of the fan club, Lu Xingchao..., and lands on How about we throw a party instead?" He Yun was.
The best chapter pointer here is Chapter 243, "How Could It Be Her?!". It opens with Hahaha, the young master's face has gone white, but I got a scare just now... and closes on Perhaps feeling that the atmosphere had become unbearably tense, Director....
The best chapter pointer here is Chapter 278, "Who Are These People Who Idolize Jiang Li?!". It opens with People from the fan club also got word that Jiang Li was soon to return to... and closes on How about we throw a party instead?" He Yun was more laid back, "You guys....
If you want the clearest chapter reference, go to Chapter 236. Early on, The short-haired youth beside them chimed in, "That's right, senior, we...; later, the chapter leans on It's getting late, and if we delay any longer, I'm afraid the wind....
A practical answer is Chapter 226, because it turns the idea into a concrete scene. The chapter opens with What was all that before then?, adds pressure through The moment Jiang Li saw it, she confirmed her guess even more., and ends on Are you sure you can be on the list of winners?] Zhou Xu: [?.