Authors Note: All aboard the Undertale hype train! Yep, I played the game about a month ago and decided to write a little something for the fandom. My personal headcanon is that San's and Papyrus are Gasters sons, and since it's been virtually confirmed that San's used to work with him or was some kind of scientist, here we have former sciency Sans. Feel free to review or message me or whatever you like. Enjoy!

This is Wingdings

Chapter One: Memory of a Nightmare

"Son, please…everything will be fine... just please…. step back from the edge."

His father's plea fell on deaf ears. His body may have been standing over the edge of the Core, but his mind was a million miles away, somewhere the flowers bloomed and the birds sang. He mumbled to himself, smiling manically as he stared past his father, past the doorway, past the flames and hellish scape of the collapsing Core. "It's a beautiful day outside." He grinned wider, his eyes burning with blue fire magic, a stark contrast to the purple of his father.

"Flowers are blooming." He took a step back. "Birds are singing." The heat of the core was on his back but Sans felt nothing but warm sunshine on his face. "On days like these…"

"Sans NO!" Gaster ran forward desperately trying to grab him. But he was too late.

"…people like me… should be burning in hell."

"Ah!" Sans woke with a start, shaking and moaning as a throbbing headache begin to work its way through his skull. His vision was blurry and his room looked faded and warped. Blue droplets of what passed as his sweat dripped onto the bed sheets. "Nghhh! Ah…n-not again…not again, not…" He stifled a moan and gripped his head. "The same dream…always… the same one …ahh…." He leaned forward fully, bringing his head to his knees and breathing through his teeth, clenching them tightly to keep quiet. The last thing he wanted was Papyrus getting worked up; even in the haze of his mind he knew that. The pain subsided as the minutes ticked away, as it always eventually did. Sans sat up slowly. The room was normal. No warped images of faces past, no distant sounds of machinery bursting and cracking. "I'm safe." He whispered it softly. "I'm safe. I'm safe. I'm safe. I'm safe." He kept repeating it. He always did after a nightmare, it reminded him of where he actually was. If he said the mantra enough he would begin to believe it. 100 "I'm safe's" later and he leaned back in bed, looking up at the ceiling. Breathing deeply, he reached under his pillow and pulled out a small picture. It was an old photograph, but the shape of four figures could still clearly be made out. Sans gently pressed his fingers to one of the tallest. "…I miss you, Dad."

The pain subsided as the minutes ticked away, as it always eventually did. Sans sat up slowly. The room was normal. No warped images of faces past, no distant sounds of machinery bursting and cracking. "I'm safe." He whispered it softly. "I'm safe. I'm safe. I'm safe. I'm safe." He kept repeating it. He always did after a nightmare, it reminded him of where he actually was. If he said the mantra enough he would begin to believe it. 100 "I'm safe's" later and he leaned back in bed, looking up at the ceiling. Breathing deeply, he reached under his pillow and pulled out a small picture. It was an old photograph, but the shape of four figures could still clearly be made out. Sans gently pressed his fingers to one of the tallest. "…I miss you, Dad."