One factor could be their shared Saiyan heritage. Since they are both Saiyans from Universe 6, they have a common cultural background which could bring them closer. Another factor might be their mutual goal of getting stronger. As they train together and face challenges, they could develop feelings for each other. Also, Caulifla's boldness and Cabba's more reserved nature could create a kind of attraction, like opposites attracting.
The first possible factor is their proximity. They are often in the same battles and training sessions. This constant interaction gives them the opportunity to get to know each other better. Their admiration for each other's strength also plays a role. Cabba is in awe of Caulifla's raw power, and Caulifla respects Cabba's technical skills. Moreover, their shared experiences as Saiyans in a new and challenging world, like in the Tournament of Power, could bond them together on an emotional level, which could potentially lead to a love story.
There isn't much officially shown about a 'love story' between Cabba and Caulifla in the original work in a very explicit romantic sense. They are both Saiyans from Universe 6. They share a comradeship as they train and fight together. They respect each other's strength and are both determined to grow stronger. Maybe in some fan - created stories, there could be a budding love, but the canon mainly focuses on their growth as fighters and Saiyans.
One possible plot could be a story where Cabba and Caulifla team up to face a new and powerful enemy in the Dragon Ball Super universe. They could train together, with Cabba teaching Caulifla some of his Saiyan techniques from Universe 6, and Caulifla showing Cabba her own unique fighting style. Their friendship could grow as they overcome challenges in battle.
One possible theme could be friendship and camaraderie evolving into a deeper bond. Since they are all characters from the same universe, they might have shared adventures that bring them closer in the fanfic.
The plot could involve Cabba inviting Caulifla and Kale to his planet for a special training session. There, they encounter a strange phenomenon that affects their ki. They have to work together to figure out how to overcome it. As they do so, Cabba and Caulifla start to develop feelings for each other while Kale looks on and learns about relationships.
A fanfiction could focus on Cabba teaching Caulifla about his Saiyan heritage from Universe 6. He could share stories of his training and the values he holds dear. This could lead to Caulifla becoming more interested in her own Saiyan roots and the two of them developing a deeper connection through this cultural exchange.
One idea could be a story about Cabba training Caulifla in a new technique. Cabba, being more experienced in some aspects, could show Caulifla the ropes. They could face various challenges during the training, like dealing with unexpected power surges or difficult terrains.
One possible fanfiction could be about Cabba and Caulifla training together in a new way. They might discover a new technique that combines their unique Saiyan abilities. For example, Cabba's more disciplined approach could blend with Caulifla's more instinctive and wild fighting style to create something amazing. Maybe they are facing a powerful new enemy in their universe and have to rely on each other to overcome it.
A common theme is growth. Both cabba and caulifla are often depicted as growing in their power and skills. For example, in many fanfictions, they train hard and reach new levels of Super Saiyan forms.
Their relationship could also be one of friendly rivals. They are both strong Saiyans. Caulifla might constantly challenge Cabba to battles to prove that she is just as good as him or even better. And Cabba would take these challenges seriously, which in turn would make both of them improve their skills and power levels.
The plot could center around Cabba and Caulifla being stranded on an uninhabited planet. At first, they struggle to survive, having to find food and shelter. But as time passes, they start to train together using the unique environment of the planet. Their relationship evolves from just comrades to something deeper as they rely on each other for survival and growth. They also face some dangerous native creatures on the planet which adds to the excitement of the story.