Another theme could be the exploration of their pasts. Maybe there are secrets about their families or how they came to be the powerful mages they are. Fanfictions might delve into these backstories, showing how their pasts have shaped them and how they come to terms with their histories while also building a relationship with each other that goes beyond just being comrades or rivals.
One common theme could be their friendship and rivalry. They are both strong characters, and fanfictions often explore how they compete with each other in a healthy way and also how they support each other when facing common enemies.
One common theme is friendship development. Since they are all characters within the same universe, fanfictions often explore how their relationships grow from just being acquaintances to close friends or more. Another theme is adventure. They might go on quests together and face various challenges that test their bonds.
Power dynamics is also a theme. Given their different magic abilities, fanfics might explore how they balance their powers in a relationship. For example, Sting's light - based magic and Rogue's shadow - based magic could interact in interesting ways in a relationship, both in terms of combat and in their personal connection.
The theme of loyalty also frequently appears. They are loyal to each other and their guild. In some fanfics, this loyalty is put to the test, like when they have to choose between their guild and some greater good that involves the other. Also, adventure is a common theme. They go on quests together, facing all kinds of magical creatures and challenges along the way.
Friendship is a very common theme. Sting and Rogue are often depicted as having a deep and unbreakable friendship. Another theme is adventure. They go on various adventures together in many fanfictions. And of course, the theme of magic is always there as they are part of the Fairy Tail world which is full of magic.
Friendship is a very common theme. Writers often explore how the reader can be friends with both Sting and Rogue, and the unique bond they all share. For example, they might go on adventures together in the Fairy Tail world.
I'm not sure specifically about Sting x Rogue fanfiction without mpreg. You could try looking on popular fanfiction websites like Archive of Our Own. Search for 'Sting x Rogue' and then filter through the results to find the ones that don't involve mpreg.
One common theme is friendship. Since they are both dragon slayers in Fairy Tail, their friendship is often explored, like how they support each other through tough times.
Another common theme is power and growth. Writers often show how Rogue and Sting become stronger over time. For example, they might face a powerful enemy and through that experience, they learn new magic or improve their existing skills. It's about their journey to become more powerful dragonslayers.
One common theme could be the exploration of their friendship in a new light. Since mpreg is a very different take, it might show how they support each other during this unexpected situation. Another could be the reaction of their friends and the online community within the story.
The theme of loyalty also pops up a lot. Their loyalty to each other, to their guild, and to their ideals is a key part. It's often tested in various situations, like when they are faced with a choice between their own desires and the greater good of the guild or their friends.