UNDERTALE: Sans x Frisk One-Shots!

Soulmates Stay Together. Always.

This chapter was suggested by Lover_Of_Fandoms13 . I know that this may not be what you meant, and trust me; I had a whole other idea for this chapter BUT I've been wanting to write this kind of chapter for AGES so *shrugs*.

There's a bit of a trigger warning here. (This gives away the chapter too easily.)

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No matter what happens. No matter what changes. No matter what the future holds.

Soulmates stay together. Always.

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"Sans? Are you alright?"

My head turned to the goat monster beside me, who seemed concerned and worried.

Absentmindedly, I shook my head and grinned like I always did. "I'm fine, Tori. Don't worry about me." I reassured her.

Toriel shrugged. "If you insist," She replied as she continued eating her food.

That feeling again...

I sighed. It's been happening all week. Every once in a while, I would feel something strange on my body. That strange feeling would change every time; the first few times were small sensations on my neck, right below my chin. Then it escalated to even stranger feelings on my wrists, sometimes they were jolts of pain that lasted for a single second. Each of those sensations would last for a moment, then it would disappear completely.

This time, though, it wasn't on my body; it was on my soul. It was as if my soul had stopped pulsing like it usually would for a second. And I was certain that it wasn't my magic acting strangely.

Meanwhile, the sound of the bathroom door opening and closing echoed down the hallway and into the dining room. After walking down the stairs, a young brunette came back to the table and sat down next to me. Everyone was too busy talking with each other to notice her, but I certainly did.

"Hey kiddo," I whispered, nudging her shoulder a little. She only smiled weakly in response and went back to eating her spaghetti. I frowned.

Speaking of strange, I was starting to suspect that something was up with the kid.

For instance, like now; a few minutes into dinnertime when all of her friends came over to eat with her, she excused herself and went straight to the bathroom upstairs. Sometimes, I wonder why Papyrus and I even bought a home with a bathroom here on the surface, but I guess Frisk would need it. She's been sleeping over more often ever since she confessed to me.

But the thing was, she had been going there a lot more often lately. And it wasn't just for a few minutes; it would be for hours. So as much as I wanted to trust her, this was really... off.

After dinner, everyone dispersed to different parts of the house. Toriel and Asgore were washing dishes in the kitchen, Undyne and Alphys were watching anime together on the television in the living room and Papyrus was packing away leftovers from dinner into the fridge. I took this opportunity to talk with Frisk, who was already making her way back to her room upstairs.

"Frisk, wait!" I called out to her, cueing her to stop walking and turn around to face me. "Yes, Sans?" She replied, her voice sounding weak and tired; definitely not like usual.

I caught up to her and slowly placed a hand on her shoulder, my eyes gazing at her face. Up till now, I had never seen Frisk's eyes before; she always kept them closed and as far as I was concerned, she had never opened her eyes in front of anyone.

"Are you okay?" I asked in concern, tilting my head a little. "You've been acting a little bit... strange, recently." A sudden thought came into my head and I started to worry. "You're not feeling sick, are you?"