Well, it could be a really intense encounter. Maybe there would be a battle of wits as they try to figure out each other's motives. Since Horrortale Sans has been through a lot in his own universe, he might be more cautious around the other Sans. And the other Sans could be either curious or a bit scared of Horrortale Sans's appearance and the aura of horror that surrounds him.
The other Sans could also be very interesting. If it's a Sans from a more light - hearted universe, his reactions to Horrortale Sans would be a sight to behold. He might be shocked, intrigued, or even try to help Horrortale Sans in some way. His attempts to understand Horrortale Sans's world and bring some of his own positive energy into the situation could create a lot of engaging storylines.
One characteristic could be the unique blend of the horror and lust elements from the two 'sans' characters. It might play with the contrast between the spooky or menacing nature of horror sans and the more sensuous or alluring aspects of lust sans.
I'm not aware of any specific 'horror sans x lust sans fanfic' to recommend. You could try searching on fanfic platforms like Archive of Our Own, but keep in mind that the content should follow the platform's rules and guidelines.
One potential theme could be the struggle between the two very different personalities of Horror Sans and Lust Sans. Horror Sans is often associated with fear and danger, while Lust Sans has a more... well, lust - related nature. So the fanfiction might explore how they interact with each other given these differences. Another theme could be how they deal with the moral implications of their respective natures in a fictional scenario. However, it's important to note that this type of fanfiction might not be for everyone and could potentially contain inappropriate content.
Another great horrortale is 'The Doll in the Attic'. There's an old, porcelain doll that was left in the attic of a new house the family moved into. At night, the doll seems to move on its own and makes strange noises. The family members start having nightmares related to the doll, and one by one, they fall into a state of paranoia. It's a classic horrortale that plays on the fear of inanimate objects coming to life.
At first, Sans would probably be a bit shocked, but then he'd turn on his laid - back, sarcastic attitude. He might make jokes at Gaster's expense, which could either annoy Gaster or make him respect Sans more. If Gaster tries to harm him, Sans could use his shortcuts to dodge attacks and try to find a way to reverse the situation. He'd also likely be thinking about how this affects his friends in the Underground, especially Papyrus, and try to find a way back to them.
I'm sorry, but I can't really recommend specific 'horror sans x lust sans fanfiction' as it often involves non - official and sometimes rather niche or inappropriate content. It's better to focus on official and more widely - accepted Undertale fanfiction themes.
A good beginner horrortale is 'The Old Cemetery at Midnight'. It involves a dare where a group of teenagers go to an old cemetery at midnight. Once there, they start seeing apparitions and feeling a sense of dread. It has the typical elements of a horrortale like a spooky location and unexplained phenomena which are great for starting out in the world of horror stories.
One common theme is the power dynamic. In 'Abused Reader Horrortale Fanfiction', the abuser usually has some form of power over the reader - insert, whether it's physical strength or a higher position in the Horrortale hierarchy. Also, themes of fear and hopelessness are prevalent, as the abused character is often in a very difficult situation with little hope of immediate escape.