I'm not sure specifically as I haven't read that particular fanfiction. It could potentially be about Megatron in his younger days, perhaps exploring his origin story, his early experiences, or his relationships before he became the well - known character we know from the Transformers franchise.
One common theme is the origin of his ambition. Most fanfictions explore how Megatron's desire for power and change in Cybertronian society began when he was young. For example, in many stories, his early experiences with inequality on Cybertron fuel his later actions.
You could try searching on popular fanfiction websites such as Archive of Our Own (AO3). It has a vast collection of fanfictions from various fandoms, and there's a good chance you might find it there.
There's also 'Megatron: The Young Warrior'. In this fanfiction, it focuses on his training as a young bot. It shows his relationships with his mentors and peers, and how his unique combat skills started to develop. It's a great read for those interested in the backstory of Megatron.
Tarantulas is an interesting character to include. He has his own devious plans that often intersect with Megatron's, sometimes as an ally and sometimes as a rival. Tigatron, with his connection to nature and his more spiritual side, can bring a different perspective to the story. And Waspinator, for his comical yet tenacious nature. Despite being often defeated, he always comes back, and his interactions with Megatron can be both humorous and revealing of Megatron's character.
Often, other Decepticons like Starscream might be involved. Starscream, always vying for power, might see Megatron's condition as an opportunity to finally take over. So he could play a major role in the fanfiction, either causing trouble or having a change of heart. And then there could be some human characters who get caught up in the events, perhaps scientists or soldiers who are trying to understand what's going on with Megatron.
The fanfiction might also explore the relationship between Bumblebee and Megatron in a more emotional way. Maybe Bumblebee discovers a softer side of Megatron that was hidden under all that aggression. It could be that Megatron has some regrets about his past actions, and Bumblebee becomes the one he confides in. Or perhaps Megatron sees in Bumblebee a potential future for Cybertron that he once hoped for but thought was lost. This could lead to a very unique and unexpected bond between the two characters.
Yes, in some fanfictions, Megatron can be depicted as younger than Optimus. Fanfic writers often take creative liberties with the characters' backstories and timelines.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). There are often a plethora of stories involving these characters. Just use the search function and type in 'Megatron x Rodimus' and you'll likely get a good number of results.
In a world where the Transformers and Megatron's universe collide, Optimus Prime finds himself in an unfamiliar realm. He discovers Megatron has formed an unlikely alliance with a group of humans. Optimus is initially skeptical but realizes they must work together to face a new common enemy, a powerful energy - sucking creature from another dimension. The story unfolds as they learn to trust each other and combine their strengths.