One common theme could be the development of their relationship in an awkward way. Maybe they start as strangers and there are a lot of misunderstandings at first.
I'm sorry, I don't have specific 'awkward Jenna and Colin fanfic' to recommend directly. You can try searching on fanfic - related websites like Archive of Our Own. They usually have a large collection of fan - created stories.
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.
Love and relationships are also very common. Since Matty Healy is an attractive figure, many fan fictions revolve around fictional romantic relationships he could have. It could be with a normal person, or sometimes another fictionalized celebrity.
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.
There are various popular matty x jack fanfic stories. Some might focus on their adventures together, like traveling to different fictional worlds. For example, a story could be about them exploring a magical forest filled with strange creatures and having to solve puzzles to get out. Another type could be centered around their friendship development, perhaps starting from a chance encounter and growing into a deep, unbreakable bond.