Yes, there are likely quite a bit. Fanfiction communities are vast and diverse. For a pairing like Ben and Rook, fans who are interested in their relationship often write stories exploring different aspects of it, from adventures they go on together to more emotional and personal interactions.
The chemistry between them. Ben is bold and impulsive, while Rook is more cautious. This contrast can create interesting interactions in fanfiction that draw readers in.
One possible plot could be that Rook and Ben go on an adventure to a new planet in the Ben 10 Omniverse. They encounter a strange alien species that has a unique power. Ben tries to use his Omnitrix to transform into an appropriate alien to deal with the situation, but there are some glitches. Rook, with his Plumber skills, helps Ben figure out what's wrong and together they overcome the challenges and make new friends among the aliens.
By having them face a common enemy. When they fight side by side against a powerful foe, they can learn to trust each other more and understand each other's fighting styles better.
There probably is. Fanfiction communities are quite large and diverse. Try looking on platforms dedicated to the fandom that Ben and Rook are from. Some writers might have explored this relationship with a kiss scene in their stories.
The friendship between Ben and Rook is a big draw. In fanfiction, it can be explored in different ways, like in tough situations or during their downtime. Also, the alien - filled universe of Ben 10 provides a lot of scope for interesting stories. Writers can create new alien species or new powers for Ben's Omnitrix, and Rook's Plumber skills add another layer of complexity to the stories.
Another theme is growth. Both characters can grow and learn from each other. Ben might learn more about Rook's culture and values, and Rook can learn about Ben's more impulsive but brave nature. This mutual growth helps to strengthen their relationship in the fanfiction stories.
Another way is by showing their daily interactions. Like when they're just hanging out between missions, sharing stories about their different worlds. Ben could tell Rook about his adventures on Earth, and Rook could share stories about his Plumber training. This would make them understand each other better and grow closer. They could also have inside jokes that develop over time from these interactions. Also, having them train together to improve their combat skills would not only make them better fighters but also strengthen their relationship as they rely on each other during the training sessions.
Perhaps a story where an old enemy of Ben's targets Rook to get to Ben. Ben feels guilty and protective. They go on the run, hiding in different places across the galaxy. Along the way, they meet some interesting characters who help them. In the end, they face the enemy together, with Ben using his Omnitrix and Rook using his upgraded Proto - Tool to defeat the bad guy.