Well, a possible plot could be that an evil force targets Bulma to get to Goku. Goku, in his determination to protect her, realizes just how much she means to him. They then start to have a more intimate relationship as they fight off this common enemy. Or, perhaps there's a misunderstanding where the Z - fighters think Goku and Bulma are in love, which makes them both reevaluate their relationship. Also, it could be that a magical spell makes Goku and Bulma fall in love and they have to figure out if it's real or just the spell while dealing with the chaos it causes among their friends.
One plot idea could be that Goku and Bulma accidentally end up in a parallel universe where they are the only ones who know each other. They have to rely on each other to survive and in the process, they discover new feelings for one another. Another could be a time - travel plot where Bulma goes back in time and meets a younger Goku and they form a bond that is different from their usual friendship in the original timeline. A third idea is that Goku gets injured badly during a fight and Bulma takes care of him. During his recovery, they start to see each other in a new light.
A plot idea might be that Bulma creates a new device that accidentally links her and Goku's minds. They start to experience each other's emotions and memories, which brings them closer. As they try to find a way to unlink their minds, they develop deeper feelings. Another idea is that during a celebration, Goku and Bulma get drunk (even though Goku doesn't usually drink) and in their inebriated state, they share some very honest and affectionate moments. When they sober up, they have to deal with the aftermath of those moments. And yet another plot could be that Goku saves Bulma from a dangerous experiment gone wrong in her lab, and this heroic act makes Bulma see Goku in a more romantic way.
Chapter 416, "Such a Sensitive Nose, Born in the Year of the Dog?", is the clearest early answer because it turns Guan Xiong's situation into a concrete plot event. It opens with Yu Li's words successfully choked Lady Nina. and closes on Why did she have to end up with such a dumb teammate?!.
Chapter 279, "The Sudden Blaze", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. It opens with After getting a good scolding, Jiang Yan resigned himself to lying...
Chapter 258, "Explosive! Jiang Li and Director Sun Are Having an Affair!", is the clearest early answer because it turns Explosive's situation into a concrete plot event.
Chapter 372, "Finish the Wine and I’ll Let You Leave", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Jin Si Yue suddenly realized that his wrist was back in proper...
Chapter 598, "She Blew Up Your Family's Lake!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event.
Chapter 436, "Do You Remember Brother Daniu by Daming Lake?", is the clearest early answer because it turns Brother Daniu's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Yu Li took the object that resembled a stone axe and weighed it in...
Chapter 450, "Your dear brother is making breakfast for you!", is the clearest early answer because it turns Lao San's situation into a concrete plot event.
Chapter 391, "Has another top celebrity had a scandal?", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.
Chapter 320, "How is She Here Too?!", is the clearest early answer because it turns Su Yinwan's situation into a concrete plot event. The chapter turns that into something concrete by moving from Although she thought this way, Su Yinwan still knew the importance of...
Chapter 470, "Why Talk About Pigs When Looking at Him?", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. It opens with Wrapped in a bit of warmth, Jiang Yan slowly came to.