One common theme could be the exploration of their relationship in different scenarios. For example, in some fanfictions, they might be facing a dangerous situation together which brings them closer. Another theme could be the development of their feelings over time, from just being comrades to something more romantic.
Fanfiction.net is also a possibility. There are many different categories and you can navigate through the Ben 10 related section to look for Ben and Rook fanfictions. However, the quality and content can vary widely so you might need to do some sifting.
One good Ben and Rook lemon fanfiction could be 'A New Bond'. It focuses on the deepening relationship between Ben and Rook in a rather emotional and slightly romantic way, while still maintaining the essence of their friendship from the original series.
Sorry, I'm not really into specific fanfiction for 'ben x rook' so I can't recommend any directly. But you can try searching on popular fanfiction websites like Archive of Our Own. They usually have a wide range of fanfictions for different pairings, and you might be able to find some great 'ben x rook' stories there.
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.
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.
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.
You can try looking on some popular fanfic websites like Archive of Our Own (AO3). It has a wide range of fan - created content, and there's a good chance you might find 'ben x rook lemon fanfic' there if it exists.
One possible 'ben x rook lemon fanfic' could be about their adventures together in a post - apocalyptic world where they have to rely on each other. Their relationship deepens as they face challenges, and the lemon aspect could be a passionate moment they share during a quiet interlude in their journey.
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.