I figured you guys would want this soon soooo here you go. It's not done yet sorry.
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"Sans! Be careful! You don't want to fall into the boiling hot pickle juice!" Cucumber papyrus called out.

Cucumber sans only grinned at him lazily. "I'll be fine bro. No need to worry. See you after work." He tells him before going to his stand. How wrong he was...

Passing by some monsters, Sans arrived at his burger stand. He sat down and laid his head on the table, intent on a nap before selling hot dogs and hot cat.

Pickle dog runs by, covered in pickle juice like usual. People questioned how he managed to swim in that stuff but no one knew since the dog was allusive as always.

Sans' stool end up getting hit, knocking him back towards the lake of boiling hot vinegar, water, and salt.

Sans' eye sockets widen as he tried using his magic to get up. Only a sputter of magic happened and his soul drop, his magic had to act up now of all times. He continued to try to summon his magic, anything that could at help him some.

As he hits the liquid, a large blast of magic shoots out from him, able to be seen from all over the underground. Sans went under and everything went black.

•a few days later...•

"Sans wake up! Wake up Sans! Please wake up brother!" Papyrus called out to his brother. He had been out for a week after he magically floated out of the boiling liquid, somehow alive. He hadn't left his side since.

The secretary of the royal guard looked at his brother worriedly. Sans was everything to him. He had been there when their father wasn't. Watched as he joined the Royal guard, though not in the position he wanted, not that he was going to complain. Sans always rooted for him. Now here he was, likely about to die and Papyrus could do nothing about it but just sit here and hope that he survived.

Gaster watched his sons, a frown on his face. He didn't understand. Sans had little hp and problems with his magic, he should've died. He should be dust but he wasn't. Sans had also let out a large amount of magic, the strongest he had seen in a while. Had his son been hiding his magic from him? He didn't know.

Papyrus laid his head on his brother's chest. "Sans... please wake up..." he whispered, a tear falling down from his eye socket. 

Sans groaned a bit and covered his face. "Pap let me sleep..." He said before turning over. C.Papyrus smiled and, very out of character, tackled hugged him to the ground.

"SANS YOU ARE ALIVE BROTHER!" He yelled happily. Sans groaned a bit as he hit the ground.

"Yeah why wouldn't I be...? Why are we in pop's lab?" Sans asked, looking around before noticing something. His bones had a yellow tint to them. He blinked before remembering what happened.

"You fell into the pickling juice brother! The only reason we found you is because you let out so much magic! I was so worried brother you have been out for a week!" Papyrus told him quickly as Sans shook.

"Bro... I don't think I'm the same..." Sans told him weakly, looking at his now yellow-green stained bones. He felt stronger than before, though he didn't gain any LV and his hp didn't rise.

Papyrus frowned a bit. "Father has said that somehow with the magic outburst and the liquid changed you. You are no longer a normal monster Sans." He told him. Their father had been furious when he had found this out. Sans' magic had actually gotten stronger, making him now able to make gaster blasters possibly. Papyrus couldn't, his magic wasn't stable enough to do so.

Sans' eye sockets widen, the inside now tinted a dark green. "W-what? What do you mean bro?" He asked shakily.

Papyrus looked at him in the eye sockets.

"Sans. You've somehow survived but at a cost. You were pickled." Suddenly the world went black for Sans.

•a few hours later...•

Sans woke up to see his father, W.D Zucchini Gaster, strapping him to the bed. He frowned and struggled a bit, making his father notice him awake.

"Hello Sans. How do you feel?" He asked and Sans blinked.

"Fine... Say pops why am I strapped down?" Sans asked back and Gaster turned away to a table.

"I am going to be doing a few test on what the CH3COOH, H2O, and NaCl mixture did to your body and soul." Gaster simply stated.

For some reason, Sans didn't believe that was the actual reason. He trusted his father though, even if he was a bastard, especially when he didn't get what he wanted.

Gaster was beyond jealous of his eldest son. His magic levels were higher than even his own now! It didn't make sense! All the others who had fallen into the liquid had ended up dusting but of course his son had to somehow survive and become even more powerful than himself! This has never happened before! Though apparently it did have some side effects, including the now yellow tint to the short skeleton's bones.

Along with... something else.

Apparently Sans had gotten a multi-personality disorder when he fell into the liquid. Though it also showed. Once while he was sleeping he had seemed angry about something and his clothes suddenly turned a few darker shades and more rough, along with his teeth becoming slightly more jagged. However, once he calmed down he turned back to normal.

He really was interesting and Gaster was going to find out about these changes if it was the last thing he did.

_Timeskip_

"Sans?" Papyrus' voice called out and Sans looked towards him weakly. He was tired and in pain from their father's experiments.

"P-pap..?" He choked out and Papyrus instantly ran over and started to undo the bindings on him.

"Sans what happened?!" Papyrus frantically asked as he gently picked up his older brother, his usually calm face showing extreme worry.

"P-paps D-dad has g-gone mad... G-get me out of h-here... p-please..." Sans pleaded tiredly, his hp at .1 at this point. Papyrus' eyes widen before he started to gently feed him a spider biscuit. Sans' health slowly healed enough where Papyrus didnt have to worry, as much, before he carried him out.

Papyrus snuck through of the lab slowly, making his way to the outside and running through Hotland all the way to Snowden. Sans leaned against his chest the whole time. He was tired and weak, even if he had eaten and healed.

Papyrus gets into their house and goes to his room. It would be easier to hide Sans' in there and their father couldn't get info from him easily.

But would it be enough?
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That's it for now guys tell me if you want more!!! I've had this saved on my phone for such a ling time and still haven't finished XD oops. Anyways chow for now my lovely Pika Pals! Stay Shocking! Pika!