Adventure is also quite prevalent. They might embark on quests or face mysterious events together. For example, in many fanfictions, they explore an ancient forest or solve a riddle in a forgotten castle.
To find Jenna and Percy fanfic, start with AO3 as it has a great tagging system. Use tags like 'Jenna', 'Percy' and related words like their relationship tags if there are any. Additionally, Twitter can be a good source. Search for hashtags related to them, and you might find authors promoting their fanfics or fans discussing and sharing their favorite ones.
Perhaps a plot where Jenna has a special power that she doesn't fully understand, and Percy, who has some knowledge about it, tries to help her control it. Along the way, they face challenges from those who want to use Jenna's power for their own evil purposes. This plot can show the growth of their relationship as they face difficulties together.
There's a fanfiction called 'Jenna and Percy's Journey'. It focuses on how they meet in an unexpected situation and then face different challenges together. It's full of interesting plot twists that keep you engaged.
Jenna is likely the main character in the story. She could be a young girl, a teenager, or even an adult. Since the story is named after her and the black cat, she's probably the one whose experiences are central to the plot.
As we don't have much information about this specific story, Jenna could be a protagonist who is a slave. She might be a symbol of the resilience of slaves in the face of the cruel institution of slavery.