One possible plot could be that Sakura is in an alternate universe where she has lost her memory and kisses someone else thinking they are her true love. Another could be that she is under a spell which makes her kiss someone else, and then she has to deal with the consequences of that action.
Maybe she kisses one of her rivals in a competition. This could be a way to throw the rival off - guard or perhaps it's a moment of sudden understanding between them that leads to the kiss. For instance, if they are in a magical competition and Sakura realizes that the rival has a side to them that she never noticed before, and in a moment of impulse, she kisses them.
A good 'Gohan kisses Videl' fanfiction often has well - developed characters. It should stay true to the personalities of Gohan and Videl as we know them from the Dragon Ball series. For example, Gohan's shy yet strong - willed nature and Videl's feisty and determined personality should be accurately portrayed.
Another plotline might involve a slow - burn relationship. They could be friends for a long time, and as their bond deepens, there could be a scene where Videl finally decides to take the step and kisses Gohan. This could be after a series of events that make her realize her true feelings for him, like seeing him in danger and realizing how much he means to her.
You can try looking on popular fanfiction websites like FanFiction.net or Archive of Our Own. These platforms usually have a wide variety of fanfictions, including ones about Gohan and Videl. Just use their search functions and type in 'Gohan kisses Videl' to see what comes up.
There are several places you can look for such fanfiction. Fanfiction.net is a popular platform that might have some stories about Videl and Gohan sharing a kiss. You can search using relevant tags like 'Videl x Gohan' or 'Videl kisses Gohan' on the site.
Another possibility is a civilian she has known for a long time in Konoha. Perhaps someone who has always admired her from afar, a merchant who supplies the hospital where she works. He might have shown his love and support for her over the years, and finally, Sakura realizes her feelings for him and decides to marry him.
It could be a jealous rival. Maybe there's another ninja who has feelings for Sakura and is trying to keep her away from Sasuke. So Sasuke has to catch her to prevent this rival from taking her away.
Maybe it's a powerful noblewoman from within the Seven Kingdoms. A woman who has been overlooked for marriage before but has her own influence and resources. Her marriage to Robert could be a way for her to gain more power and for Robert to gain more support within his own realm.