One common theme is family. Since Lynn is part of the Loud family, many fanfictions explore her relationship with her siblings and parents. Another theme is sports, as Lynn is very sporty. Stories often revolve around her sports achievements or challenges.
Luan Loud might become more responsible. If Lynn Loud Sr takes her under his wing, she could learn from his life experiences. For example, she might start to see the importance of planning ahead instead of just going with the flow for her comedy acts.
Another plot could involve Lynn Loud Sr trying to teach Luan Loud some old - fashioned values. Luan, being her humorous self, might find unique ways to either embrace or subvert those values. For example, if Lynn Sr tries to teach her about the importance of hard work, Luan could turn it into a comedy skit about different jobs that ends up inspiring the whole family to work together on a project.
One great Lincoln Loud x Lynn fanfiction could be about them teaming up for a sports competition. In this story, they might overcome their differences and work together to win, showing their bond in a new light.
One idea could be that the male reader is a new neighbor. Lynn at first challenges him to a sports competition because she's competitive. But as they spend more time together, they discover they have a shared love for a certain type of music and start bonding over that.
First, think about their personalities. Lincoln is the middle child and often has creative solutions, while Lynn is athletic. You can start with a simple situation like a family game day where their interactions lead to a new adventure.
Create conflict. For example, Lynn's busy sports schedule could clash with the time the male reader wants to spend with her. This adds drama and keeps the readers interested.
There were two novels with the male lead named Nangong Ying. They were "Torturing Love: Demon, Please Let Me Go" and "The Tang Dynasty of the Other World." I hope you like this fairy's recommendation. Muah ~😗