The fanfic could be a romantic story involving the doctor and a patient seeking butt growth for a specific reason. It could explore the emotions and conflicts that arise from this unconventional situation.
Such a fanfic could potentially focus on the challenges and experiences of a gay doctor dealing with unique cases of butt growth, along with exploring their personal and romantic life.
You could write a story where they go on a new adventure in a previously unexplored time and place.
Well, you could imagine her getting involved in a haunted hospital and using her knowledge of Doctor Who and Rose to solve the mystery. Or perhaps she has visions of Rose guiding her through difficult medical cases with a spooky twist.
You could write a time-travel adventure with Aelita Madeline and the Doctor facing off against a powerful alien threat.
You could write a story where she has adventures in time and space inspired by her love for the show.
Another option could be a time-travel adventure that takes characters from Game of Thrones to different eras in the Doctor Who universe. It could lead to all sorts of interesting plotlines and character developments.
You could write a romantic fanfic where they have a forbidden love story. Maybe Cassandra saves the Doctor in a dangerous situation and their relationship blossoms from there.
One possibility is a fanfiction where they accidentally get trapped in a time loop and have to work together to break free. It could showcase their intelligence and determination. Another idea could be a story where they meet in a parallel universe with different rules and circumstances, forcing them to adapt and reevaluate their relationship.
How about a fanfiction where Tim Latimer travels back in time with the Doctor and changes a significant event in history? This could lead to all sorts of interesting consequences and challenges for them to overcome.
You could write a crossover story where Doctor Who helps the Avengers in their fight against Thanos. Maybe the Doctor uses his time-traveling skills to give the heroes an advantage.