Work had been long. Seriously, it had. 5 exams to watch over, a staff meeting, assembly, 2 fights at lunch. Sans was more than happy to get home and lay his boney body down on the comfortable fortress of solitude that was the large king sized bed he shared with toriel. Sleep in turn took over his senses, and he was in bliss.

*CRASH*

Sans quickly sat up, his magic eye flaring. Toriel stayed where she was, obviously oblivious to the sound. Scanning the room, sans saw nothing in his room. His thoughts quickly lead to frisk. Fearing the worst, and sprang up, Careful not to wake toriel, and crept towards their bedroom door. Silently clicking the door open, sans quietly stepped into the dark hallway

"Ok, someone's broken into the house. I need to get to Frisk before I do anything, or they could be in danger, especially if the person who's broken in is armed." He thought, creeping down the silent hallway. The long hallway was pitch black, making hard to see, even with sans' magic eye. He passed by a few rooms, before reaching frisk's room, which was a white door with stickers all the front with 'Frisk' written on it. Gently, Sans opened the door and peeked in. What he didn't expect was Frisk's room to be trashed, with the window smashed and Frisk whimpering, on the verge of tears again in the corner, a large cut wound on their right shoulder. Sans stared mortified at the sight.

"Frisk, by asgore, are you alright?!" Sans whisper-yelled as he quickly crept over to the child, his eyes returning to normal. Upon seeing him, the young child slunk into the corner further, hiding their face from him. Sans looked at them, puzzled. He sat there for a second, staring at the child in bewilderment.

"hey, hey kiddo. Calm down, its just me. What happened? Why is there a cut on your shoulder?" Sans asked, manipulating gravity to turn the lights on. Frisk's clothes were tattered, so there was obvious signs of a struggle. The wound was bleeding heavily and Frisk's breathing was low. Sans struggled to hold back his anger

'Who DARED touch my child. I swear, they come back, and they will have a VERY BAD TIME' He cursed, holding the still sobbing child in his arms.

"Wow Sansy~, how rude is that? Ignoring your best friend when they come to visit you~" Came a sickly-sweet voice behind Sans. He slowly turned and froze at the sight before him. Standing behind was another child, the same age as Frisk. They wore the same leotard and flats frisk normally wore, apart from the green sweater with a single yellow band through the middle, and the same colour hair. They're eyes were beyond bloodshot, to the point where they looked as if the entire eye was just a blob of red. In their hand was a knife, with a blade already painted in blood.

"YOU…" Sans spat, his pupils disappearing from his eye sockets, and his magic beginning to form inside him.

"So nice to see you too, Sansy~" The child laughed. Sans stood up from where he was kneeling next to frisk. He ripped chara's soul out, hovering it in front of him, and turning it blue.

"I don't know who you are, but if you did this to Frisk, you better be reading for a VERY BAD TIME" He growled. Instead of cowering, or even looking remotely worried, they kept the same creepy smile plastered on their face. Sans throw a bone attack, which hit the soul head on. The child barely flinched, dropping their guard momentarily. As it hit however, Sans heard frisk groan in pain behind him. He turned and saw frisk's HP on 2.

"Oh, I should also mention. Me and frisk share a soul kinda. You hurt me, you hurt frisk. Do you really want to be the reason frisk dies right here, right now~?" Came a satanic giggle. Frisk looked up at sans, still teary-eyed. It took Sans a moment to realise what this demon was saying was completely true. If he tried to kill them, he'd kill frisk. He clapsed his hands into his pocket, and pulled out a monster candy, and put it in frisk's mouth. It was gone almost instantly, and sans saw frisk's HP rise to 12.

"Well, I may not be able to attack you now, but there is one last idea I have" He smirked, before clasping the soul before him in 2 different directions of gravity, tearing the soul at the seams. The child dropped the knife and fell to their knees. Sans heard frisk groaning behind him, but he didn't care.

'If I split the soul, it will give half to frisk, removing any risks of killing them by mistake' He thought. Increasing his magic, he saw the soul begin to split.

"What are you doing? You cant split a soul…" The child groaned in pain. Sans liked this look, a lot actually. Slowly increasing the magic, he looked back at frisk, who had thankfully passed out. The pain of their physical wounds and their soul basically being ripped in half must've been too much on the poor child.

"Really, cant I? Well, watch me" Sans groaned, the exertion of using so much magic apparent. With one final tug, the soul split. The child collapsed where they were were, and sans dropped to his knees, spent. What happened next was interesting…

The 2 soul fragments started vibrating intensely. Out of one, the other half was replaced with a black fragment, making a red and black soul. Out of the other, a white fragment appeared and connected to the other half, making 2 whole souls, the white returning to frisk and the black returning to the other child.

"What the hell? 2 full souls? They should've stayed as 2 fragments. Where did the other halves come from?" Sans thought aloud. His train of thought was interrupted by Frisk's door bursting open. Toriel emerged from the open doorway, a fireball primed in either hand. She did NOT look happy.

"What is going on here?!" She growled, before seeing Frisk unconscious in the corner. Toriel dismissed the fire and ran to Frisk, clutching the child in her arms. Frisk began to stir, then saw Toriel and shuffled deeper into toriel's arms.

"What happened here? Why is frisk BLEEDING?" Toriel asked anxiously. Sans was about to respond, when he heard Toriel gasp. She covered her mouth in shock. Sans was utterly confused as to why then saw where her gaze laid. She was looking directly at the other child.

"C-Chara? My child, is it really you?"

*A.N. AND DONE. I legit wrote this in class, when I was *kinda* supposed to be doing actual school work. So, I came up with the soul idea on the fly, by mistake to be honest. The soul frisk has now is a HOPE soul, as im dubbing it. Chara's now is a HATE soul, basically making them a Ying and Yang sort of deal? I don't know. I guess since they're half magic souls, Frisk and Chara can now perform magic? Once again, Don't know. That'll be figured out in a later chapter.

Have fun for now,

Exfinity~