A Fold in Space » A UnderLust-UnderFell Crossover «

Part 1 of 17: The Outsider

Warnings: explicit sexual scenes, crass language, mental instability, physical abuse, gore, degrading treatment, psychological torture, yandere behaviour

This book is dedicated to Mercy_Run's "Karmic Retribution" on AO3. It's an amazing story! Be sure to give it a read!

This is not a continuation from "Twisted Love". In this timeline, Lust hasn't had the chance to meet the human yet. Instead, he is accidentally folded into a fluctuation in time and transported to a different AU.

Lust - UnderLust Sans
Papyrus - UnderFell Papyrus
Fell - UnderFell Sans

Hey guys, I kind of decided to rewrite this book, because someone told me I was rushing the story plot too much. So yeah, there's another book, which is a rewrite of this one, and it's called "Red's Diary". It's practically the same story (not really), but better. So read that first before you read this book!

(UnderFell)

UF Sans and Papyrus walked together around Snowdin town, patrolling their daily route. Just as they neared the edge of the woods near the ruins, the pair saw a peculiar figure in strange clothes standing with their back to them.

UF Papyrus stared at the figure's purple vest and black pants fitted into blue boots. No one in the entirety of UnderFell dressed like that. This was obviously an outsider.

"Sans."

UF Sans looked up. "Yes boss?"

"I want you to incapacitate that person." He pointed to the distant figure.

"Right away boss." UF Sans moved forward, his eye flaring crimson as he sent sharp bones to fly towards the distant figure.

Lust Sans, sensing something behind him, dodged the missile at the last moment. The bone missed him by a hair, cutting through part of his vest.

Lust narrowed his eye-sockets, raising his hand in return to send lilac bones in a sinusoidal fashion towards his attacker. The enemy responded with brutal quickness, dodging swiftly and sending his own bone wave towards the purple magic-wielding monster.

Lust's eyes widened in surprise at the familiar attack pattern. He weaved through the wave, but with much difficulty. He wasn't used to being on this side of the attack.

Fell Sans attacked viciously, not letting Lust rest for a minute. It was obvious who was the stronger. Perspiration beaded on Lust's forehead as he dodged all of Fell's missiles, but his movements were becoming more and more sluggish as the fight progressed.

Finally, a Gaster Blaster sent Lust reeling into a bone field, tripping him. He fell down. Before he could get back up, Fell sent bones shooting up from the ground through Lust's legs and arms, trapping him. Lust screamed in agony as blood began to flow from his wounds.

Papyrus and Fell approached Lust, who was fighting to stay conscious from the pain. Sweat trickled down his forehead as he breathed heavily.

Papyrus looked down at Lust. Now that he was closer, he could see that this monster really was different from any monster he had ever seen. The skeleton before him looked very similar to his brother, but there were noticeable differences in their features.

The strange skeleton was much more slimmer and smaller than his brother, and his bones were smooth and shiny. He had no scars whatsoever on his body, which was a rarity in UnderFell.

Instead of the ruby magic that most monsters here wielded, the skeleton's magic was a deep purple, standing out widely from the black and red colours that consisted of most of this universe.

"Should I kill him?" Fell asked with a indifferent expression, staring down at Lust. Papyrus snapped out of his pondering, focusing back on their victim with a contemplative look.

"Like hell you will." Lust spat, glaring at Fell and Papyrus. Turning, he spit the blood that was already trickling from his mouth at their feet.

"Hmm." Papyrus mused, looking down at Lust. This one was feistier than he looked, he considered appreciatively. "On second thought, no. Don't kill him. He may prove useful to me."

Lust turned to Papyrus, giving him a piercing glare. "I'm not gonna help you in any way whatsoever."

Papyrus just smiled back at him. "Take him with us." Papyrus ordered, turning and walking away.

Lust cried out as Fell retracted the bones from his limbs. The last thing he saw as he finally passed out from the pain was Fell reaching down to pick him up.