There might be a fan fiction that delves into their past. Maybe a story about how they grew up together, showing Papyrus' attempts to get Sans to be more active in things like training while Sans just wants to take it easy. This could explore their brotherly bond in more depth.
One interesting Sans Papyrus fan fiction could be about their daily adventures in the Underground. For example, a story where they encounter a strange new monster and have to use their combined wits to deal with it. Sans' laid - back attitude and Papyrus' enthusiasm make for an entertaining dynamic.
Another type of Sans Papyrus fan fiction could be a humorous one. Picture a story where Papyrus tries to cook his famous 'spaghetti' and Sans has to find a way to save the day when things go horribly wrong, like the kitchen getting flooded with over - boiled pasta water.
A great Underswap Sans x Papyrus fanfiction might be the one that delves into their backstory. It could explore how their relationship developed from when they were younger. Maybe there was a time when they had a big fight but then learned to understand each other better. This kind of story can be really heartwarming as it shows their growth and the strength of their brotherly love.
Another place to check is FanFiction.net. There are many Undertale fan fictions there, including ones focused on Sans and Papyrus. Just be aware that the quality can vary, so you might need to read a few summaries before diving into a story.
One interesting plot could be their initial confusion when they meet. Sans is used to his own world's Papyrus, and suddenly meeting Underswap Papyrus would be quite a shock. They might have a comical exchange trying to figure out who the other is.
A great idea could be a story about their daily adventures in the Underground. For example, they could be on a quest to find a rare ingredient for a new recipe Papyrus wants to try. This would focus on their brotherly bond and Papyrus's enthusiasm for cooking, while Sans tags along with his laid - back attitude.
The clash of personalities. Underswap Papyrus is usually quite positive and energetic, while Underfell Sans has a more edgy and guarded nature. This contrast can lead to really engaging interactions in the fanfictions.
One characteristic is the strong focus on their brotherly relationship. Fanfics often show how Sans and Papyrus rely on each other, like in how Sans might be the more laid - back one while Papyrus is full of energy and enthusiasm, and they balance each other out. Another is the use of the unique Underground setting. It provides a backdrop for their adventures and interactions. For example, they might be dealing with other monsters while also strengthening their own bond.
One popular sans fan fiction might be 'Underfell Sans' stories, where Sans has a more menacing and darker personality compared to the original. It adds an interesting twist to his character.
A popular sans x papyrus fanfic is 'Shared Skies'. It has a really interesting plot where they face a new threat together in the Underground and their bond grows stronger as a result. 'Soulful Bonds' is also a good read. It dives deep into their emotional connection and how their personalities complement each other. 'Brotherly Love' is a simple yet effective fanfic that just showcases the pure love and care they have for one another.
A plotline could be that they discover a hidden part of the Underground. This new area could have different rules and strange creatures. They have to adapt quickly to survive and also figure out how this new place relates to the rest of the Underground.
Another plot twist could be that Papyrus realizes the fight is all an illusion. In the fanfiction, he might see through some sort of magic or mind - control that was making Sans fight. So, he then has to figure out how to break the illusion and save Sans from this false battle.