Author's Note: Thanks for all the reviews! I'm really glad everyone seems to be enjoying the story so far! This might be the last update for a few days but don't worry, that'll give me more time to plan more ;)

Chapter 4: Under the Impression

I slammed the door shut and felt my bare feet meet freshly fallen snow and ice with each step. I felt the contact chaff my soles but I didn't care. The wind was blowing stronger than I anticipated as I ran against it, struggling to see more than 10 feet in front of me.

"That was not Sans"

I covered my face with my arm's sleeve. As I did I could still breathe in Sans' scent.

"…or was it?"

My running slowed, my adrenaline easing back enough that I could feel how freezing the night truly was.

"What am I doing?"

I looked further out by the river. I could see a clearing up ahead, somehow it was avoiding the blizzard I was trapped in. I just had to make it there and I knew it would get better… Anywhere was better than being in that living room right now. I thought back to earlier before I fell asleep. I remembered how Sans mentioned what I saw that first night in the living room was probably just a dream… But what I just saw couldn't have been a dream. I was asleep though, before I was woken up by Sans…

"But what was Sans doing?"

My mind raced with the images I had of Sans. Smiling, happy, comedic Sans. But what I saw moment ago… Could that really be the same Sans I know? My chest tightened with fear as these new images of Sans' flaming blue eye took over my mind. It wasn't just his eye that burned, but what seemed to be his whole being.

I shook my head. I didn't want to believe that was Sans. For whatever reason that version of Sans just felt wrong. That rendering of Sans gave me a mix of emotions I didn't know where was coming from. Another voice murmured in my head "He's going to kill you."

I stumbled when I made it to the mouth of the cave that would lead to the Waterfalls. My pajama bottoms seemed to be soaked with ice, parts sticking to my freezing ankles as well. I got off the ground and tried to shake off the ice and other snow that was attached to my clothes and hair.

The Waterfalls were significantly warmer but the closer you got to the water's edge, cool pockets of air could be felt. The way the water reflected and refracted the glow of the crystals from above was beautiful. Blues, purples, pinks, and greens light up the walls and parts of the streams of water. I began to feel more relaxed. I couldn't help but look around and realize I was completely alone.

What if Sans followed me? Should I look for a hiding spot? Could I even return back to the house?

I felt a jolt of familiarity follow those thoughts. Just run, hide, that mountain looks like a good place to runaway…

I gripped my head. What was happening to me? Am I a coward? I feel like I'm just constantly running, rarely catching a moment to just breathe. I flee everywhere I go. I heard the voice again: "Be friends with people who can outrun you" followed by childish laughter.

"Who's there?!" I spun around, that voice seemed too clear, too loud to be in my head. Am I losing my mind?

My voice echoed, catching several echo flowers in the process. I stood still, eyeing my surrounding and hugging the jacket closer to my body. I've dealt with monsters like Papyrus and Undyne, I can handle anything out here. What if the real monsters only come out at night?

I froze once more, the soles of my feet dug into the dirt and rocks. I was followed after all. I could see a figure slowing down their pace.

"Sans…" I looked down at a few echo flowers which picked up my voice and carried his name over to where he stood.

Sans walked slowly over to me, a pained expression on his face. He ignored the snow sticking to his pant legs and shirt. His eyes never leaving my face, I felt myself taking a step back, I could see a dark blue light growing brighter with each step he took.

"frisk…" That was the first time he ever spoke my name.

I allowed him stand in front of me, I could see distress in his eyes. I could see now that I hurt him. Sans reached out to place his hand on my cheek, but I flinched away.

"What… what are you?" I looked away and sucked in my breath, I chewed nervously on my lip.

He didn't seem to know what to say. He cleared his throat before saying "i'm your pal sans, kiddo." He gave a weak smile.

I sighed through my nose. Of course he was. I knew that. But…

"What were you doing while I was asleep?" I gulped. Would it better if I didn't know?

He looked away, ashamed. "kid, do you ever have déjà vu moments? moments that felt like they've happened before?"

I looked carefully at him before I answered with a soft "No, I don't."

"well, i think i do sometimes. do you know what the kicker is though?" Sans rubbed his arms, my eyes falling his movements.

"What?"

Sans inhaled. "it's you kid. i don't get you."

My eyebrows furrowed. Me? "What's there to get?"

He chuckled lightly. I stepped closer, feeling braver now. When he reached out to grab my shoulder I allowed him this time.

"it's hard to explain because i don't completely understand it myself… i just know every time i see you i feel like i'm remembering something i'm not supposed to."

This puzzled me. "But what were you doing exactly?"

He blushed lightly and I saw the light from within his chest cavity brighten again. "i just was watching…"

"Watching me sleep?" I didn't know how I felt about him watching me sleep. "Okay… then what's with the blue flames?"

He laughed, "oh this?" and a second later his left eye glowed a brilliant shade of blue. I stumbled back. Was that really…?!

"You were watching me the first night too?" I yelped.

Sans looked away and kicked at the ground. "this is my magic frisk. doing this allows me to see better at night. i didn't mean to scare you buddy."

His words didn't set aside my anxieties much. I felt a little violated. I felt like the voice in my head was right… should I really be trusting him? He isn't giving me concrete answers, I feel like he's avoiding the truth. But maybe it's better that way…

"Were you going to hurt me?" I looked directly into his eyes. If he was lying, this was the only way I'd ever be able to tell.

Without warning, Sans pulled me closer to him by my shoulders. "kid, don't ever think that. i promise to protect you, and i hate making promises."

His eye flared up for a moment, but this time I wasn't scared. Instead I realized the same glow from his chest was actually radiating a small amount of heat. He loosened his grip and let me go.

"i don't want you thinking i'm some creep but… i don't want to lie either…"

"What do you mean?" I looked up into his eyes, his eyebrows drooped and his mouth frowned slightly.

"i was in your dream."

I swallowed. "How did you know?"

"heh, no kid, you don't get it. i was in your dream. that wasn't your dream sans, that was the real thing."

My eyes widened. That Sans who ate breakfast with me, was not just my imagination of Sans but truly Sans, sharing my dream with me.

"Why were you in my dreams to begin with? How long has this been going on?" I felt my breath hitch, words were becoming difficult to form in my throat.

"tonight was the first night… i had only a theory it was possible, i wasn't sure it would work until now." Sans look off at the waterfalls and echo flowers. I looked at how the reflection of colored lights bounced and danced on Sans' face and body. I reached out to hold his hand. I wanted to make sure this wasn't a dream right now.

He looked down and watched as I intertwined my fingers with his. I swallowed and asked: "What were you expecting to find?"

He idly rubbed his thumb over the back of my hand. "like i said, i'm not sure. i guess, i figured all this déjà vu might be a warning…"

"and you think I'm a sort of threat?" a voice whisper in my head, very very softly "maybe you should be…"

Sans smiled down at me. "no buddy. i don't think that, especially after being in your dream."

We both remained quiet for quite some time. The only sound being the waterfall rushing down and foaming behind us. I began leaning into Sans, fatigue setting in. His eyes widened as I wrapped my arms around his chest, I could feel the blue warm against my cheek and I squeezed a little harder.

"What do you think my dreams are about?" I asked, looking up and resting my chin on his sternum.

"i don't know kid, they're your dreams." Sans cautiously wrapped his arms around me in return.

I let out a yawn, "Yeah but all my dreams since I've arrived to the Underground seem to take place somewhere else. Somewhere in a big house with a big forest in the backyard."

He shrugged. "I didn't know you were in such a hurry to leaf."

I was too tired to laugh so I gave another squeeze and closed my eyes. I felt Sans give a slight shiver, causing me to look up again.

"Cold?" I asked, but Sans shook his head. I smiled and began taking off his jacket.

"i said you could use that pal, you've got to be cooler than me. well, only person cooler than me is Pap." he chuckled.

"I know you're cold though" I laughed. "C'mon Sans, please?"

He looked over at me, holding his jacket and beginning to shiver. I just now realized I had been stepping one foot back and fourth on top of the other foot, trying to warm them up.

"i have a better idea kiddo." Sans turned around "give me the jacket and hop on my back."

I felt a little skeptical but went along with his idea. After I wrapped my arms around his collar bones, with a big sweep he slid his arms into the jacket, allowing us both to be wrapped in its protective warmth.

"ready to go home?" he whispered. My yawn answered for me.

He chuckled as he walked back out into the snow. No longer a blizzard but gentle snowflakes fell and swirled around us. I smiled and nuzzled my face into his neck and shoulder. Before I knew it, I was asleep.

When I woke up the next morning, I saw Sans sleeping on the floor next me, his jacket acting as a blanket across my torso. After that night I felt like I was filled with more questions than answers, but for now, I wanted to enjoy this moment "before it could be taken away from me"

What?

Author's Note: Who could that be talking in Frisk's head? Might not be who you think it is... I'll try to add another chapter tomorrow but this weekend is looking crowed for me. So expect the next update to be Sunday night for sure. Thanks everyone!