There's also 'Starscream's Secret Admirer'. In this one, the story is more on the cute and fluffy side. It shows a different aspect of Starscream's personality as he interacts with the reader. It's a really refreshing take on the relationship and makes for an enjoyable read.
One main theme is loyalty. Given their different allegiances at times, it's explored how far they'll go for each other. For example, in some fics, Starscream may be torn between his own ambitions and his loyalty to Skyfire.
Yes, there are quite a few out there. You can start by looking on fanfiction websites like Archive of Our Own. Just search for 'tfa megatron x starscream' and you'll likely find some interesting reads.
Loyalty and betrayal are also common. Given Starscream's history of betraying others in the original series, fanfics often explore whether he can be truly loyal to Predaking and vice versa. It adds a lot of drama to the story.
One common theme is the idea of redemption. Starscream is often seen as a villain, but in fanfiction, he might be on a path to redemption, and Bumblebee can play a role in that. For instance, Bumblebee's positive attitude could influence Starscream to change his ways.
You can try looking on fanfiction websites like Archive of Our Own (AO3). There are often a lot of fan-written stories about various pairings, including Knockout and Starscream. Just use the search function on the site and type in 'Knockout x Starscream' to see what comes up.
A good Knockout x Starscream fanfic often has well - developed characters. It should stay true to their personalities as seen in the Transformers series. For example, Knockout's vanity and love for his finish, and Starscream's ambition.
The action and adventure aspects are key too. They often face various threats together, like rogue Decepticons or new menaces to Cybertron. Their combined skills, Knockout's medical knowledge and Arcee's combat abilities, make for exciting battle scenes in the fanfictions.
Power struggle is a common theme. Megatron is the leader and Starscream is always vying for more power. Another theme is loyalty, or lack thereof, especially from Starscream's side.
One interesting story could be about their unlikely alliance. Maybe they team up to face a common threat in the Transformers universe. They put aside their differences and combine their unique skills to outwit their enemies.