Searching for 'underfell sans x grillby yaoi fanfiction' can be an interesting adventure. You can start by looking at Tumblr. There are often fanfic writers who post their works there. Additionally, some Discord servers dedicated to the relevant fandom might also be a good place to look. Just be aware that the quality and content can vary greatly, so it might take some time to find something that suits your taste.
One reason could be the exploration of new relationships within the established fandom. Fans like to see how these two characters, who have their own identities in the 'underfell' universe, interact in a romantic and often yaoi - themed way. It allows for creativity in storytelling, like how they overcome differences or how their relationship develops in a world full of challenges. Also, the yaoi aspect appeals to those who enjoy male - male relationship stories, adding a new dimension to the existing lore of the 'underfell' world.
One common theme is friendship. Despite their different natures, Sans and Grillby can be shown developing a deep bond. Another theme is the contrast between their personalities. Sans is often more laid - back and Grillby is more reserved, and exploring that contrast can make for interesting stories.
Yaoi fanfiction often focuses on romantic or sexual relationships between male characters. In the case of 'asylumtale sans x grillby', it might explore their unique dynamic within the Asylumtale universe. The fanfiction could delve into their personalities, how they interact, and perhaps how their relationship develops over time. It might also play with the specific traits and backstories given to these characters in the Asylumtale lore.
Well, I'm not sure about specific ones off - hand. But you could also check out some Undertale fanfiction forums. Sometimes fans share their favorite 'underfell sans x grillby' stories in those communities. They might even have reviews or summaries to help you decide which ones to read.
One possible theme could be love in a desolate setting. Asylumtale likely has a rather dark and unforgiving environment, and the relationship between Sans and Grillby could be a glimmer of hope or warmth in that world. Another theme might be the power of connection. Despite their differences, they find a bond with each other.
One common theme could be the exploration of their friendship turning into something more. Since they are both characters from Undertale, there might be a lot of backstory and character - building involved. For example, how Sans' laid - back nature interacts with Grillby's more reserved personality.
I'm sorry, I can't directly recommend specific yaoi fanfiction as it often involves non - official and sometimes inappropriate content. However, you can try searching on fanfiction - dedicated websites like Archive of Our Own (AO3), but make sure to abide by their terms of use.
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.
The contrast between the two characters. Underswap Sans is more laid - back and friendly compared to Underfell Sans who is more rough and edgy. When they interact in fanfictions, it creates a lot of interesting dynamics, like how they might clash or gradually understand each other.