For some fans, it's about exploring different aspects of the Transformers universe in a more 'out - there' way. MPreg in general is a very niche and interesting concept in fanfiction, and when applied to these well - known characters, it can create stories that are both thought - provoking and entertaining. It's a way to break the boundaries of the traditional narrative and see what kind of new stories can be told.
It can also be appealing from a creative writing perspective. Writers can play with the personalities of the characters in this new and strange scenario. For example, how would Optimus Prime react to Megatron being in such a state? And vice versa. It gives a whole new layer to their complex relationship.
You can try looking on some fanfiction websites like Archive of Our Own (AO3). It has a large collection of Transformers fanfictions, and there might be some related to Optimus Prime and Megatron in the MPreg genre.
In a fanfic about Optimus Prime x Megatron, their relationship could be explored in a more philosophical way. For example, they might debate the nature of good and evil, power and responsibility. Optimus believes in protecting all life, while Megatron has his own ideas about power and how it should be used. This kind of fanfic could show how their different viewpoints could either bring them closer together or drive them further apart.
A great angle for a Megatron x Optimus Prime fanfic could be a body - swap situation. They are forced to inhabit each other's bodies due to some alien technology gone wrong. This leads to them having to understand each other's perspectives on a whole new level. They start to see the reasons behind their actions in the past and develop a new - found respect for one another.
The plot could be about a power struggle. Megatron wants total control over Cybertron, but Optimus Prime stands in his way. However, instead of just fighting, there are political intrigues involved. There could be other characters influencing their decisions. Maybe some Autobots who think Optimus is being too soft on Megatron, and some Decepticons who think Megatron is being too cautious.
In a fanfiction where they unite, it could start with a common threat that neither side can face alone. For example, an alien race invades Cybertron. Megatron and Optimus Prime realize that their brotherly bond is stronger than their differences. Together, they could form a new strategy, using both Autobot and Decepticon forces in a coordinated way to repel the invaders.
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.
A really cool fanfiction I read had Female Optimus Prime and Megatron in an alternate reality. They were both outcasts in their own worlds. They formed an unlikely alliance and the story focused on their journey together. It was full of action and also some really sweet moments where they showed that they cared about each other's well - being, despite their past enmity.
One possible storyline could be a redemption arc for Megatron. In this fanfiction, Megatron, after countless battles with Optimus Prime, begins to question his motives. He realizes the destruction he has caused and tries to make amends. Optimus, initially skeptical, gradually sees the change in Megatron and they form an uneasy alliance to face a greater threat that endangers both Autobots and Decepticons alike.
The key elements include the power struggle. Since both Optimus Prime and Megatron are powerful leaders, their struggle for power can be re - imagined in a more intimate or emotional way in lemon fanfictions. There's also the idea of redemption or change. Maybe Megatron shows a softer side or Optimus Prime has to deal with feelings that go against his usual principles. And of course, the setting and the way the story is narrated to create an atmosphere that can support this rather strange but interesting relationship.
One great storyline could be a story where Megatron and Optimus Prime are forced to team up against a greater threat from another universe. They have to put aside their differences and learn to trust each other. Another could be a pre - war story, exploring their relationship before they became enemies, perhaps they were once friends or comrades. A third could be a story where they are both stranded on a strange planet and have to rely on each other's unique abilities to survive and find a way back home.