Well, perhaps in the fanfiction, Bumblebee gets stolen by a human villain who has an obsession with Transformers technology. This person tries to dissect Bumblebee to figure out how he works. Meanwhile, Bumblebee's human friends team up with the Autobots to find his location and save him. They have to outwit the villain's security systems and traps.
One possible plot could be that a group of evil Decepticons steal Bumblebee because they know he has some valuable information stored in his memory banks. The Autobots then launch a rescue mission to get him back. They might face various challenges and battles along the way.
It could be some rogue Decepticons who are trying to gain favor with their leader by presenting Bumblebee as a valuable captive.
One idea could be that Bumblebee is taken by a group of Decepticons who plan to reprogram him. Another could be that he's taken by a secret human organization for study. Maybe he's taken by a powerful alien race to use his abilities for their own purposes.
In some fanfictions, it could be an unknown alien species. They might have detected Bumblebee's unique energy signature and decided to take him to study his technology or abilities. This could lead to all sorts of interesting adventures as Bumblebee tries to communicate with them and find a way to escape.
In a more complex plot, Bumblebee and Smokescreen could be framed for a crime they didn't commit. The other Autobots start to suspect them, and they have to go on the run. While on the run, they start to uncover a conspiracy within the Autobot ranks. They have to prove their innocence and expose the real culprits all while avoiding capture by their own comrades and the ever - present Decepticons.
A plot could revolve around a world where sarees have some sort of magical power. Saree, the character who wears this saree, accidentally stumbles upon Bumblebee. The saree's magic starts to interact with Bumblebee's technology in strange ways. This leads to them having to figure out how to control these interactions while also being chased by a group who wants to use the saree - Bumblebee connection for their own evil purposes.
Maybe the baby bumblebee is trying to prove its bravery to the older Transformers. But during a test or challenge, a Transformer accidentally tickles it, and it starts to giggle uncontrollably. This makes the other Transformers see the baby bumblebee in a different, more endearing light, and they start to include it more in their activities with lots of tickling - inspired games.
The plot could be centered around their unlikely friendship turning into something more. Maybe they start off as enemies due to their different allegiances, but as they get to know each other better, they develop feelings. The 'lemon' part could be about a moment of realization of their deeper connection.
Well, the plot might involve Bumblebee getting injured in a battle. Sari takes it upon herself to nurse him back to health. While she does this, they have long conversations and get to know each other on a deeper level. This time together makes them realize they have strong feelings for one another. But then there could be a conflict where Sari has to choose between her human life and a life with Bumblebee, and in the end, they find a way to be together despite the odds.
One possible plot could be that Dante, perhaps a young and curious adventurer, stumbles upon Bumblebee in a hidden, abandoned junkyard. Dante is initially startled but quickly realizes Bumblebee is no ordinary machine. Bumblebee, being the friendly Autobot he is, tries to communicate with Dante through his radio sounds. Dante, with his quick thinking, starts to understand and they form an unlikely alliance to protect the junkyard from a group of thieves who want to steal valuable parts from the old cars there.
One possible plot could be that Bumblebee and Blitzwing are forced to team up during a crisis on Cybertron. They start off as enemies but gradually learn to respect each other's skills.