Well, perhaps a plot could involve Megatron dealing with the physical and emotional changes while still trying to maintain his leadership among the Decepticons. It could show a more vulnerable side of him that was previously hidden. And his followers might have different reactions, some seeing it as a sign of weakness and others as a new strength.
One idea could be exploring how the other Transformers react to Megatron in this unexpected state. Maybe some are shocked, while others see it as a chance for a new beginning in the ongoing conflict.
In some 'pregnant Megatron fanfiction', a possible plot could be the search for the cause of this situation. Is it some sort of alien technology gone wrong? Or could it be a curse or a strange experiment? As he tries to figure this out, he also has to face the internal power struggles within the Decepticons, who are divided on how to handle their leader's new condition. This could lead to all sorts of alliances and betrayals within the group.
One idea could be a human mechanic who discovers Megatron in a damaged state and tries to repair him while hiding him from other humans and Autobots. This could lead to a complex relationship where Megatron starts to question his views on humans.
Well, a plot idea could be that there is a prophecy about Bumblebee and Megatron. It says that they will either bring about the end of the Cybertronian race or save it. This forces them to interact more and try to figure out what the prophecy means. Another interesting plot could be that Megatron's mind is somehow transferred into Bumblebee's body and vice versa. They have to live in each other's shoes for a while and this changes their views of each other. And then there could be a plot where a new technology is discovered that can end the war, but Bumblebee and Megatron have different ideas on how to use it, leading to a complex relationship and many conflicts.
There could be a fanfiction where a strange energy source affects Optimus Prime and Megatron, causing them to swap personalities or abilities. This would be a humorous yet also thought - provoking plot. They would have to navigate their new selves while still trying to lead their factions. The Autobots would be confused by an aggressive Optimus and the Decepticons would be equally bewildered by a more pacifist Megatron.
One idea could be an OC who is a medic that gets captured by Megatron. Megatron initially sees the OC as a tool to use against the Autobots but gradually develops an odd respect for the OC's skills and tenacity. Another plot could involve an OC who has a special power that Megatron wants to harness for his own evil plans. As he tries to manipulate the OC, the OC starts to see through his lies and tries to turn the tables on him. A third plot might be an OC from a different dimension who accidentally lands in the Transformers Prime universe and catches Megatron's attention. He's intrigued by this strange new being and tries to either recruit or destroy the OC.
Perhaps a fanfiction where Soundwave gets damaged in a fight and Megatron has to make a difficult decision about whether to risk everything to save him. It could explore their loyalty to each other. Or a plot where they are betrayed by one of their own and they have to work together to expose the traitor.
One plot idea could be that Female Starscream tries to prove her loyalty to Megatron in a way that no other Decepticon has. She might go on a dangerous mission alone, which Megatron initially doubts she can succeed in. Another idea is that there could be a power struggle within the Decepticons where Female Starscream is seen as a threat to Megatron's leadership by some, but Megatron secretly has a soft spot for her and protects her. A third idea could be that they are forced to work together in a situation where they are stranded on a strange planet, and during this time, they develop a deeper understanding and connection.
One idea could be a crossover where Megatron somehow ends up in the RWBY universe. He might see the potential for power in the Dust and try to take control of it. Another idea is that the RWBY characters have to team up with an Autobot to stop Megatron from causing chaos in their world.
One plot idea could be that Megatron and Optimus Prime are forced to team up in an alternate dimension. They have to put aside their differences to face a common enemy that is threatening the very fabric of that dimension. Maybe it's an ancient evil that has the power to destroy all Cybertronians.
One idea could be a story where a human mechanic is the only one who can understand Megatron's complex machinery, and they form an unlikely bond. Another could be a post - war scenario where a human diplomat tries to negotiate with Megatron for peace, leading to a deeper understanding between their species. Maybe a human scientist discovers a way to communicate with Megatron on a mental level, and they end up sharing knowledge that could change both of their worlds.
One idea could be focusing on how Naruto and Hinata prepare for the baby. Naruto might be excited yet a bit nervous about being a father, while Hinata is calm and starts knitting baby clothes. Another could be about their friends' reactions. Sakura could be giving Hinata pregnancy advice, and Kakashi might be secretly happy for them.