The House of Undertale AUs

Chapter 26

Y/N's POV (a day before the x-ray incident and after they came home from Outertale):

I was so tired that day. Reapertale Chara was getting on my nerves. Seriously, another bad guy—or girl—already? At least Ink is getting Geno a good ending so he's out of the game.

"Hi Y/N," UF Frisk greeted me. I narrowed my eyes. Something from her voice seemed off.

"Frisk," I said carefully. "Are you... sick?"

Frisk immediately flinched back, like she was trying to avoid the word. "No! No, I'm not—" she cut off as a small coughing fit came over her. "—not sick."

I rolled my eyes. "Right. Get to bed and I'll get some non-tasting medicine, okay?" Frisk nodded, knowing that she was defeated and headed off to Underfell room.

I quickly grabbed some medication from my lab and ran to Frisk's room.

Frisk, thankfully, was in bed like I told her. She smiled as I entered. I felt her forehead tenderly with the back of a hand.

"Gosh, Frisk. You're burning up," I almost exclaimed. She breathed a small sigh.

Then, the door opened. "Heya, kiddo," a laughing voice said. I turned around to see UF Sans. His expression went from humorous to worried when he saw my glare. "What's wrong?"

"Frisk is sick," I simply replied. I spooned a large portion of the medicine and tried to give it to Frisk. She moved her head every time I showed it to her, obviously avoiding the medicine.

"Frisk, eat the medicine," I said, frustrated. "It'll heal you, Frisk, if you just eat it!"

"Here, let me try," UF Sans suggested. It was the last thing I wanted to do, but it was the only thing I got left.

"Fine."

I walked to the far wall of Frisk's bed while UF Sans walked to Frisk. "Hey there, sweetheart," he immediately said. I flinched. How dare he called my sister 'sweetheart'?

"If I kiss you..." he continued. "Would you eat the medicine? For me?" Frisk blushed deep red, whether from her sickness or from UF Sans, I wasn't sure.

And then I realized that UF Sans was leaning in super close to Frisk. I almost screeched out loud, "NOOOOOOOOO!!!!" when Frisk suddenly fainted.

I tried to control my composure. "Great," I said with a small scowl. "Now we need the stronger stuff." I started to pack the medicine away.

"Ok..." UF Sans said, almost as if he really sad about missing the chance to kiss Frisk. I scowled mentally in my mind.

"Y/N?" Gaster asked. He had gone silent sometimes to try and calm the powers down so it won't control my madness and at least let me rest. "Maybe you should leave?"

I took his hint. "No."

"Y/N, let fate take its course," Gaster sighed. "You know you can't stop that, no matter what."

I sighed. "Sans," I said loudly, not looking away from what I was doing. "I'm going to get more medicine. Can you watch over Frisk for a while?"

UF Sans looked like an eager puppy that was treated with a bone. "Sure, no problem."

I glared at him. "You better make sure Frisk stays in bed. And no shortcuts to anywhere. I know your secrets. I have my eyes on you two." I angrily walked out, not wanting to see what happens later.

UF Sans' POV:

As soon as Y/N closed the door, I opened immediately snapped my head towards Frisk. "Hey, kiddo. You really didn't faint, did ya?"