They could be in an adventure together. For example, Stewie and Brian could go on a journey through time, using Stewie's wacky inventions. This would be in line with their characters' personalities as Stewie is always creating strange things and Brian is often dragged into his schemes.
No. 'Stewie and Brian' are characters from a family - oriented show. Writing sexual fanfic about them is inappropriate as it goes against the family - friendly nature of the original source and can be considered a form of inappropriate and unethical use of the characters.
Fanfic involving Brian and Stewie in inappropriate or sexual situations is not appropriate at all. 'Family Guy' is a show mainly aimed at comedic and family - related entertainment. Such inappropriate fanfic goes against the general spirit of the show and is also not suitable for a wide audience.
One common theme is friendship. Despite their differences, Brian and Stewie often form a strong bond in fanfics. Another theme is adventure, like going on wild trips around Quahog or even to other fictional places.
One idea could be a story where Brian and Stewie go on an adventure in outer space. They could encounter strange alien species and have to use their wits to get back home.
Since the show 'Family Guy' has a large cast of characters, it's likely that the novel would also include some of the supporting characters. Quagmire could show up and add his perverted sense of humor to the mix. And Meg could be there, with her awkward teen - age experiences, which could contrast with Stewie and Brian's more out - there adventures.
No. Such fanfiction is inappropriate as it objectifies the characters in an improper and unethical way. The characters of Brian and Stewie are part of a comical family - based show, and this kind of sexualization distorts their original portrayal. It's not in line with the spirit of the show and can have a negative impact on the fan community.
One common theme might be the unique bond between Brian and Stewie. Since they have such a complex relationship in the show, fanfic writers might explore that in a different light.
One aspect that makes Brian x Stewie fanfic interesting is the unique dynamic between the two characters. Brian, the intellectual dog, and Stewie, the baby genius with a devious side, create a lot of room for creative and often humorous interactions in fanfiction.