Well, a popular plotline is the exploration of their different powers. Frisk has their unique abilities and Betty has hers. In some fanfictions, they end up teaching each other about their powers. Also, there could be a plot where Frisk and Betty are from different timelines that somehow merge. This creates a lot of tension and also opportunities for their relationship to grow as they navigate this new, chaotic situation.
Writers often start with conflict. Since Betty is usually seen as a bit of a bad girl in Glitchtale, there's an initial tension with Frisk. They might make Frisk be the one to break through Betty's tough exterior. For example, Frisk could save Betty's life in a dangerous situation, which makes Betty start to question her views on Frisk.
A frisk novel could refer to a type of novel that has a lot of brisk or lively elements in it, perhaps in terms of the plot which moves quickly, the characters who are energetic, or the writing style that is dynamic and engaging.
Their relationship can develop through shared responsibilities. As they prepare for the baby, they'll have to rely on each other more. Sans might take on more tasks to ease Frisk's burden, and this can strengthen their bond.
I don't know for sure, but she is probably the main character in the 'betty knox ghost story'. Since it's named after her, she must be the one who has some kind of experience with the ghost.
Their relationship would become more mature. They would have to rely on each other more. Instead of just being friends or lovers, they are now co - parents. They would have to communicate better to take care of the baby's needs.
It often starts with curiosity. They meet in the Underground and are intrigued by each other. As they spend more time together, they start to trust one another. For example, Frisk might show Chara the power of kindness, and Chara might show Frisk some of the secrets of the Underground.
Betty Broderick was a woman who was deeply wronged in her marriage. She felt scorned when her husband had an affair and left her for another woman. Her story is one of a woman pushed to the edge by the actions and neglect of her partner.
There's this fanfiction called 'Sans and Frisk: Bonds Beyond the Barrier'. It's a long - form story that not only showcases their relationship but also how they impact the entire Underground world. It has detailed character development for both Sans and Frisk and is really engaging.