(The source comes from a tumblr user called subarkindeyo. They are AMAZING at drawing Sans x Frisk art, so you guys would want to check 'em out~!)

"Why?"

My left eye caught the sight of the same person emerging from the Ruins. The exact same figure wearing the same lavender dress with short bell sleeves stopping midway through her upper arm. The figure had snow white skin, freckles and chocolate-brown hair in a bob cut, her wavy locks stopping at her neck. My hands were stuffed into blue pockets, crunched up into small fists.

"I've killed you countless times... Over and over and over again..."

The figure sharply noticed my muttering and turned her head towards me.

"So why... "

Her eyelids slid opened revealing a pair of bright, shiny black eyes, sparkling with joy. Her face was spotted with a flush of red blush and a smile was encased on her lips.

"Why do you keep on..."

Her smile widened as she closed her eyes once more.

"Smiling for me-"

BA-BUMP!!

A small drop of sweat trickled down my skull like butter as a scarlet red blush spread all across my cheeks. A small gasp escaped my throat as unexpected tears welled up at my eye sockets.

I was struck with utter confusion. I don't understand... Why am I crying...? Instinctively, my right hand flew to my face, trying to wipe away my tears. But no matter how hard I tried, I couldn't stop crying. I just couldn't...

"Please..." I whimpered softly. "Stop..."

"Stop smiling for me...!!" Before I knew it, my red soul was peeking out of my jacket, giving off a fluorescence scarlet glow. My left fist pressed against my ribcage, where my soul was, a steady and fast heartbeat seeming to go on for hours.

"Why... " I muttered, my voice cracking in tears. "Why is my heart... beating so fast...?"

"Why is it pounding so hard in my chest!!"

"What is this..." The tears just continue pouring down my face.

"This... sensation...?"

Something was hammering in my hollow chest. The feeling was... almost undescribable; something like a punch but it was soft and delicate, not too hard to punch the life out of me.

I don't know if it's my soul or my non-existent heart, but right now, I don't care. All I know is that it was beating my chest so hard, that it became more and more painful and repetitive and predictable all at once, beat after beat. I couldn't care about anything else at that moment. Even if the other monsters saw me, I wouldn't have given a damn about it. All I was focused on was... my heartbeat...? Or whatever humans call that, anyway.

"It... It hurts... " I whimpered, my teeth clenching against each other. And it was true. Slowly, the fist on my chest uncurled and crept up by skull, stopping at my right eye. My left hand situated itself on my chest again, feeling the constant 'ba-bumps' that seem to fly by faster than I think. A red blush was spreading across my face, reddening into a deep scarlet. And the tears didn't stop, either.

I had lost my visuals on the human.

"Please..." I whispered softly, my feet shuffling backwards. "Please, I'm begging you..."

Before I know it, my hip collided with the counter of my infamous hot dog stand, sending a sharp grunt to my throat. Beads of sweat were trickling down my skull like butter. My breaths became shorter and shallower. My soul was radiating a constant crimson aura. The heartbeats were becoming more frequent. Stronger, faster, sharper, harder...

And my tears just don't stop. Why am I so sad about, anyway?

"Please... stop..." My cold, bony fingers began to press against the corners of my eye socket. Hard.

"Please..."

"Please..."

"Please..."

"Please..."

"Please...!"

Losing my sights on the human was the worst fatal mistake I have ever made.

All of the suddenly I feel a smooth, soft palm slither up my left cheek. I felt its fingers first, crawling up my cold yet warm cheekbone flustered in red. Then, its palm rests itself in the smack middle of my cheek, the fingers crawling up my temples. My head jerked upwards to see the owner of that hand.

The human.

My red eye instantly locked itself to her brown ones. Eyes that sparked care and concern and... worry? She's worried for me?

An abrupt heartbeat interrupted my thoughts, cueing me to cringe a little, slowly closing my eye sockets. The human girl noticed this and lightened her touch on my cheek, an understanding smile inscribed on her lips. My rib cage felt like it was going to burst apart and my teeth were going to crack due to my grinding.

Minutes turned into hours. I could hear a pin drop.

After all that, I couldn't take it anymore. I grabbed the axe that was lying against my hot dog stand and raised it high...

No... I can't... I can't kill her...

I... just... can't...

A red wisp of smoke surrounded my body as I teleported away. I didn't bother to see how the human react. I had to get her out of my mind.

My skull eventually rested against the sturdy trunk of a forest tree, the blush on my face slowly disappearing. My body collapsed to the snowy floor, my back against the tree trunk. My tears didn't stop; I still couldn't understand. Why was I crying? Why did I feel that way when I saw the human? Why couldn't I kill her?

... What was that feeling?

~~~~

"It means that you love her."

I scrunched up my face in amusement. "What?"

"Sans," she continued. "If you have these type of 'feelings' when you're close to her, then that means that you love her."

My mind processed this thought for a few seconds before I shrugged. "Y'know that I can't love anyone, Tori. I don't have a heart."

"Sans..." She said sternly. "Don't say that. You do have a heart. It's just not... physically there."

"You don't sound convinced." I teased.

"Are you?" She asked back.

"... ... ... Alright. I'll try. I'll try to understand." I gave in.

Behind the door to the Ruins, I could hear a small giggle.

~~~~

Was this what she meant? I thought to myself. Is this what she called... 'love'?

Though deep down, I knew that the relationship was forbidden. I couldn't love her, or anyone else. I would lose my true nature of a monster. The minute I fall in love, I would not be 'me' anymore. The 'me' that made head-dogs of humans for us to survive. Besides, how would she love me? After I killed her so many times?

"But I can't bear to lose my feelings for her..."

I silently muttered to myself as I cried to sleep.

I have to forget about her. I have to.

Even if it costs me my life. 

~~~~

A/N: I'M SORRY IF THIS ONE-SHOT SOUNDS REPETITIVE. I WAS REALLY FLOODED WITH THE FEELS WHILE I WAS WRITING THIS ONE SO THINGS MAY HAVE BEEN REPEATED.

I MEAN, LOOK AT IT!!! IT'S SO DAMN SAD, MAN!! IT'S SO SAD... :((((

I CAN'T TAKE IT!!! *huddles in the corner and cries* ;_;