No, it is not appropriate. Writing sexual fanfic about a real person is a violation of their privacy and can be considered disrespectful and unethical. We should respect the rights and dignity of others.
There is no factual basis for any unethical or inappropriate'sex story' regarding Danielle Panabaker. She is an actress known for her work in various projects, and spreading unfounded rumors of this nature is unethical.
You can write fanfic that focuses on her characters' adventures in the shows or movies she has been in. For example, if she played a superhero, you could write about her character's heroic deeds and how she saves the day.
I'm not sure if there are specific "stories" in a general sense. Danielle Panabaker is an actress known for her work in various movies and TV shows like 'The Flash'. We can talk about her acting career, for example, her role in 'The Flash' where she plays Caitlin Snow and Killer Frost, which shows her great acting skills in portraying complex characters.
Danielle Panabaker has a positive influence on the industry. She has been part of some great projects that have inspired others. For example, her character in 'The Flash' has given hope to many fans. Also, she seems to be very professional on set, which is always a plus in the entertainment world.
Well, actually, there are no rumors about a love story between Danielle Panabaker and Robbie Amell at all. We should not be quick to pair up actors just because they seem to have some sort of connection in their work. They are likely just focused on their individual acting careers, and while they might be friendly with each other, there's no sign of a romantic involvement.
There could be a lot of issues with 'danielle cohn sex fanfic'. Firstly, it is inappropriate to write sexual stories about a real individual. It can also lead to a negative impact on the person's reputation. Moreover, it may not be legal in many jurisdictions as it can be considered a form of harassment or invasion of privacy.