Chi - Chi might also be heartbroken. She loves Goku deeply despite his flaws. In fanfiction, she may initially be in denial, thinking that Goku will come back soon. But as time passes, she realizes that he may not return, and this could lead to a deep sense of sadness and loneliness. She has to then figure out how to raise their children on her own.
Goku would likely be extremely excited. He has always had a longing to know more about his Saiyan heritage and his father. Meeting Bardock would be like a dream come true for him. He'd probably ask a million questions about his past and Saiyan culture. Chi - Chi, on the other hand, would be a bit more reserved at first. She'd be polite but also a bit cautious, as she doesn't know what this Saiyan from Goku's past might be like. But as she sees Goku's joy, she'd warm up to Bardock.
In this fanfiction, the story could develop in a way that Goku's decision not to marry Chi - Chi has a ripple effect on the entire Dragon Ball universe. His friends might be shocked and try to persuade him otherwise. But Goku stands his ground. This could lead to new alliances being formed as some characters side with Goku's decision, while others support Chi - Chi. The lack of the Goku - Chi - Chi marriage also means that Gohan's upbringing is different. He may grow up with a stronger sense of independence, seeing his mother as a sole provider, and this could influence his future actions and development as a fighter.
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.
Maybe in this fanfiction, Goku realizes that he and Chi - Chi have very different personalities. Chi - Chi is often more concerned with family and a stable life, while Goku is a free - spirited adventurer. This clash of values could lead him to decide not to marry her. For example, Chi - Chi may want Goku to stay at home and help raise Gohan, but Goku is eager to explore new planets and fight powerful enemies.
Often, fanfiction writers will describe the setting around the kiss. It could be in a beautiful, peaceful place like their home on Mount Paozu, with the sun setting in the background. The description of the kiss itself might include details like the softness of their lips and the emotions that pass between them, like love, relief, and a sense of belonging.
One reason could be his pursuit of stronger opponents. Goku is always eager to test his strength and find new challenges. In fanfiction, this might lead him to leave Chi - Chi to travel the universe in search of the toughest foes. He might feel that staying at home with his family restricts his growth as a fighter.
I'm not sure if there is an actual fanfic with that exact plot. Fanfic topics can vary widely, but this seems like a rather unfaithful and out - of - character concept considering Chi Chi's strong bond with Goku in the original series.
His life might be more focused on his training and adventures. Without the family responsibilities of being a husband and father, he could freely travel the universe seeking stronger opponents and new challenges. He might also be more involved in protecting the entire universe rather than just his family.
Family is a common theme. Since they have a family in the Dragon Ball series, fanfictions often explore how they raise their kids. Another theme is love, of course, showing the depth of their relationship.
Well, in fanfiction, Goku kissing Chi - Chi can be a way to explore different scenarios. For example, it could be a moment of reunion after Goku has been away for a long time on a tough battle or training. This kind of scenario can bring out a lot of emotions, both from the characters themselves and from the readers who are fans of their relationship.