Sure. There are quite a few. In these fanfictions, the interactions between Underfell Sans and Frisk can be really interesting. For example, they might start off as distrustful of each other since the Underfell world is more hostile. But as the story progresses, they learn to rely on one another. It could be that Frisk's kindness starts to break through Sans' tough exterior in this version of the story.
One popular theme is redemption. Underfell Sans is often portrayed as a more 'evil' or at least morally grey character compared to the regular Sans. So, stories might focus on his journey towards redemption with Frisk's help. Another theme is survival. Given the harsh nature of the Underfell world, they often have to fight for survival together.
One plot idea could be a redemption arc for Underfell Sans. Frisk could be the catalyst for his change, helping him to see a different way of living in the Underground. For example, Frisk might show him acts of kindness that he's not used to, and this could start to break down his tough exterior.
Sure. You can check out platforms like Archive of Our Own (AO3). Look for the 'underfell sans x frisk' tag and then filter out the works that are marked as inappropriate or lemon. There are often many well - written, family - friendly fanfics that explore their relationship in different ways, such as adventure - based stories where they team up to face challenges in the Underground.
Frisk would be a likely candidate. Since Frisk is the main character in Undertale and has a very adaptable personality. They could approach Underfell Sans with an open mind and try to understand him.
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.
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.
There's 'Sans - Bound'. This fanfiction focuses on the challenges they face when they are forced to work together. It's not just about their relationship but also about the world - building in the undertale and underfell universes. The descriptions of the settings are vivid and add to the overall charm of the story.
Another theme is friendship or partnership. They often come together to face challenges in the Underground. For example, in many fanfictions, they join forces to defeat a powerful monster or solve a mystery that threatens their world. This theme of unity despite their differences is really appealing.
Characterization is key. A good fanfic should accurately portray the personalities of both Underswap Sans and Underfell Sans. Their unique traits, like Underswap Sans' more positive and friendly nature compared to Underfell Sans' tougher exterior, should be well - presented.