Their relationship can be developed by having them face a common danger. For example, if their plane crashes on an uncharted island. They'll have to rely on each other to survive, and this shared experience can bring them closer together.
One plot idea could be that Baloo and Rebecca have to team up to save the business from a new competitor who is using underhanded tactics. They start off bickering as usual but gradually realize they make a great team.
There's a 'baloo and rebecca fanfic' that focuses on their friendship. It shows how Baloo's carefree nature and Rebecca's more practical side complement each other. They get into all sorts of situations where their bond is tested and strengthened. For example, they might have to work together to save their community from a natural disaster or deal with a difficult neighbor. This fic really delves deep into their relationship dynamics.
The main characters are Bagheera and Baloo, of course. Bagheera is a black panther, known for his sleekness, intelligence, and ability to move quietly in the jungle. He is often the more cautious of the two.
The allure lies in their dynamic. David is ambitious and wants to make a name for himself in Night City, while Rebecca is this feisty, loyal comrade. In fanfiction, they can be put in all sorts of scenarios. They might get caught up in a conspiracy that forces them to rely on each other even more than usual.
One interesting plot could be Bagheera and Baloo going on an adventure to save the jungle from a new, unknown threat. They use their unique skills - Bagheera's stealth and intelligence, and Baloo's strength and knowledge of the jungle - to overcome difficulties.
A theme that often pops up is redemption. Maybe Nathaniel has made mistakes in the past and through his relationship with Rebecca, he tries to redeem himself. And sometimes, the fanfictions explore the theme of family, how their families (or lack thereof in some cases) influence their relationship and how they build their own little 'family' unit together.
Another theme is growth. Fanfictions such as 'Growing Together' show how Ted and Rebecca help each other grow personally and professionally. They learn from each other's experiences and become better versions of themselves, which is really inspiring.