Well I’m definitely going to go with enemies to lovers for him and Swapfell Sans. Because of their positions in their respective universes, they would probably both want to be in control/in charge of the situation. And thus, their rivalry was born. Eventually though, they’ll realize they have a lot more in common than they’d anticipated. It gets lonely at the top, and they’ve both made some bad decisions in the past that they still regret. After an emotional confrontation, they finally realize that they can open up to each other.
I also feel like it would definitely be a slow burn for him and swapfell Papyrus. Slim is damaged, and Papyrus sees so much of his brother in him that it hurts. Papyrus wants to take care of him… Even if he doesn’t know how to make things better with his brother, he can at least help Slim. As they spend more time together, he realizes that Slim is very easy to talk to, and he isn’t half bad looking either…
That leaves fake dating for him and swap Papyrus. This would probably start with Stretch teasing him. Eventually, things get heated and Papyrus makes a bet: if Stretch were dating him, he would fall in love with him in three months. Now, too proud to back down, he has a date with him on Friday night.
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