So, I wanted to know a little about how you see soulmates? I honestly want to see your take when it deals with HMF Sans in particular while it deals with a particular Soulmates AU. Usually, whenever I write Soulmates AU... to add DRAMA to the setting, I'd like to the soulmates the ability to feel the other's pain.

I want to know how'd HMF would think during the incident that caused his head to cave in while dealing with a universe akin to how I would write a soulmates AU. Would that change anything about what happens?

This is a very good question!

I like to write Soulmates as a resonation between Souls. It may be two Souls who are extremely similar to one another, so similar they hum the same tune. It may be two Souls that are different in the perfect way, singing like a harmony. In physical terms it's a mutual feeling of comfort and ease that you just can't explain. It can be platonic or romantic; Soulmates may be couples, but they may also be best friends.

Monsters place a lot of cultural importance on Soulmates, because their Soul constitutes so much of their being. Monster Soulmates feel the attraction a lot stronger than humans do. For Monsters it's super obvious, and for humans, it's a gut feeling.

Though definitely a good start to a relationship, being Soulmates doesn't guarantee a perfect happy ending! Relationships are still relationships, that require work and love and patience. Soulmates are still individual people. They can fall out with one another, if either party won't put in the leg work.

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A personal note on this; I know some people make Soulmates a super big deal in their writing, the mega crux of relationships, if you're Soulmates you're guaranteed to be in love forever. And that's totally fine! I just don't really gel with that idea. Like... what about the rest of me? What about my personality, my hobbies interests, my wants? I'm more than an arbitrary magical link with someone. When I read 'we're Soulmates therefore I love you' I start to think stuff like "Would this person not love me otherwise? Would they even LIKE me if we didn't have this magical link? Do they actually care about me, or do they just start caring because they think they need to?" I feel that I wouldn't want to be with someone who only suddenly starts liking me because magic told them to.

In most of my stories, I don't make Soulmates a big thing. In a lot of them my characters aren't even Soulmates at all. It's why I like @recklesslycaffeinated's spin (in Six Ex-cell-ent skeletons) so much; the skeletons are her Soulmates but they love her for reasons outside of the Soul stuff. Sans even makes it clear to the Mc in the sequel that being Soulmates doesn't guarantee a relationship at all, it just guarantees some kind of connection, and being Soulmates with her is just a bonus that makes him feel comfortable. I love that take.