When Sans came to his senses, he was lying on a bed, still tied up.

Pupils flickering and darted around in his sockets, he wiggled his toes to come to realisation – he was in his Gaster Blaster form. What had happened? Why was he tied up? Where was Papyrus and Frisk? Were they okay? Had he hurt anybody? The beast wriggled around in his capture with a few disgruntled snorts. If he had muscles they would all be aching, even then he still had an extremely uncomfortable feeling all over his body.

"Ah, brother!"

He turned his head to see the owner of the voice, letting out a sigh of relief as he realised his brother was at least alright. Sans shook his head a few times to clear his thoughts, he was more experienced with being a blaster than Papyrus and knew very well trying to speak wouldn't work. At least it wouldn't be something easily understood. Something told him he had a lot of explaining to do when his transformation ended…

"Sans…?" Papyrus cautiously reached out a hand, not sure if he was still the savage blaster and not his brother. Lucky the makeshift rope was still tied around his mouth, otherwise he might have to go searching for his arm.

Staring at the gloved hand in front of him, Sans couldn't help but wonder if his brother had transformed as well. It had only ever happened once, because it was the only time Papyrus had actually caught him as a blaster – the rest of the times he tried to keep to himself as best he could, which had worked up until now. He made a lazy attempt for the gesture by bumping his brothers' hand with his snout, then laying his head back down onto the bed.

Papyrus turned his head to address someone who must be behind them. "Alphys! He's being friendly, do you think he is still feral?" There was the sound of claws shuffling against the ground then a yellow figure popped up beside his brother, someone Sans couldn't quite put his tongue on who…

"Don't be so sure, Papyrus… He c-could be putting on a, um, act." She stared into the eyes of the Gaster Blaster, a bead of sweat forming on her forehead. Alphys was no doubt intimidated by him, although he wasn't colossal he was still an extremely tough predator and no doubt designed to do some serious damage to victims.

It didn't help he had the instincts of a wild animal, either.

If only they would last longer…

Sans snorted, it was typical of the lizard to think of these things. She did have reasons to be cautious, especially after the true lab drama but he was still annoyed. On that thought, where was he? Did Alphys have a new lab? He only now lifted up his head to look around – it was almost an exact replica of her old lab.. The one that didn't contain amalgamates.

"He nudged my hand without biting me, and didn't growl this time – we might be getting somewhere. I told you Sans was strong enough to come back to reality!" Papyrus proudly announce, pleased that he was closer to becoming right.

"Hmm… I r-ran a few tests on him earlier… You both, uh, share the same, um, type of magic?" Alphys wasn't sure how to describe it, and caught the confused look Sans gave her. That savage look in his eyes was gone, but she still didn't want to get her hopes up until he had transformed back into a humanoid skeleton… If he ever would.

"I want to try something," Papyrus focused his eyes on the orange ropes wrapped around Sans' muzzle, a flicker of orange in his eye as they slowly loosened and faded off – Alphys looked panicked but didn't know what to do, she didn't have the courage to actually act on the situation. What was he doing? Sans would kill them if he was free!

As soon as the ropes were removed from his muzzle, Sans snapped it open and closed a few times before feeling the ropes untie from his front and back paws. He slowly wiggled each claw and popped a few of his bones back into proper place, before looking over at his brother with a toothy grin. He knew Papyrus would know when it was safe, he could always rely on his brother despite his apparent naivety in some situations.

"Ahhhh!" Alphys squeaked as the blaster carefully got off the bed and started to head towards her, a glimmer of annoyance flashing in it's pupils. She backed up carefully only to catch the optimistic smile Papyrus was giving both of them – was he crazy? The lizard always had been confused by his happiness. Sans got closer and closer until his muzzle was directly in front of her face, she was too afraid to actually move. Alphys had a bit of trust placed in Pap, but she still didn't underestimate Sans.

GRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAH!

The roar made her fall backwards onto the floor, as Sans lifted his head back and made what sounded like a… Laugh? It was a series of short growls like coughs, but happy-sounding – as happy as a blaster could be anyway. Alphys looked towards Papyrus who looked shaken by the roar but still as happy as ever.

Okay, so maybe for once he was right.

"S-Sans! You scared me..." Alphys cleared her throat nervously, still unsure if it was actually the hoodie-wearing skeleton or just the beast being a bit of an asshole. "Can you, uhh, transform back…?" Papyrus was able to after having a whine about his missing boots, which quickly got replaced by a spare, since "a royal guard must always be prepared!"

Sans grinned at his brother then at the scientist, he didn't know where this sudden happiness came from but it felt good to be back. His smile soon faded as she asked the question, could he really? It took a lot of willpower for him to be able to change back fully, and if he managed it he would need clothes. Chirping at Papyrus, he gestured a clawed paw to the battle body then to himself.

"Oh, right! Alphys," The tall skeleton stood up, a little dramatically, "Our transformations aren't completely magical. Our clothes get ripped off… I was able to fix mine with magic and help from Toriel, but we didn't collect Sans clothes. So we're going to need to get some if he wants to change back!"

"A-and how do you suggest we do that? I have no sp-pare clothes..."

"WOWIE, THIS IS REALLY FUN!"

After a bit of an argument and screaming, Papyrus and Undyne were sat on top of Gaster Blaster Sans, as they galloped out of the lab and towards the brothers' house. Alphys hadn't agreed to come along in case he became out of control again, and instead sent Undyne in her place to help out if anything went wrong.

It turned out to be a lot more fun than expected.

Sans was surprisingly smooth with his running style, and with the spikes along his back keeping a good grip on him was easy. Despite not being a giant blaster like Papyrus, he had a strong back and posture and was able to carry both his brother and the fish monster on his back without dropping dead from exhaustion. The only complication was jumping, as you never know if a loose bone or spike would hit one of his friends in the face.

Alphys' lab was hidden behind a casual looking house, that was in a small town that barely anyone really lived in. It was easy to sneak past humans, and if they asked they could make up and excuse he was some sort of horse with paint… Humans seemed to believe anything unless they were Frisk.

It was a bit of a hike to get to their home, but conveniently everyone shared a home close-by all the others to avoid any deaths or disasters happening – everyone would be there to help out if needed. Frisk tended to live with Toriel, but would occasionally stay with Papyrus and Sans for the weekend if they were allowed to. It was a good life, but Sans already felt guilty for letting his problems get in the way.

If he was just able to endure the suffering for a little longer instead of transforming he might have been able to avoid this whole situation. Who knows who and what he had hurt when he was feral? Sans still had to check on Frisk to make sure they were alright. That he hadn't hurt them – or anyone close to them. Unlike in the Underground, time couldn't be reset on the surface. One little mistake and it would all be gone.

Everything would.

Sans gulped the guilt down his non-existent throat, they were getting closer to the house now. Papyrus even loudly pointed out he could see it in the distance, which while made the blaster cringe, managed to distract him from his thoughts and keep him on path and focused. His brothers' loud voice was handier than he gave him credit for!

Claws digging into the ground, he brought the "Sans Train" to a stop in front of their house, waiting for the two to get off his back before heading towards the door. He was about to open the door with his surprisingly vertile fingers, but noticed the hesitant look his brother was giving him.

"Hmm, how do I say this?" Papyrus squinted for a moment before continuing. "You are very… Spiky. I think it is best if you stay outside while we search for clothes, otherwise I will have a lot of mess to clean up once this is over." He snorted, knowing Sans wouldn't help clean up if his life depended on it.

The blaster was perfectly content with doing nothing, especially after that run. He nodded his head and padded a distance away, falling onto his stomach and immediately started to emit soft snores. Undyne gave a critical look at Sans, shaking her head before the two remaining monsters headed inside.

"Are you sure his room is open? You complain a lot about it being locked," the fish monster asked as she looked around. It was an exact replica of their old house, with an improved kitchen and a slightly cleaner layout. Despite all the mess left on the floor.

If Papyrus had a tongue, he probably would've clicked it in disgust. "This place is disgusting, I fail to see why Sans refuses to clean it." Looking up towards the door of his brothers' room, he placed a hand on his chest. "If it is locked, I am sure I can come to my senses and pick the lock, dire situations is where my greatness really shines though! Nyeh heh heh!"

Undyne raised an eyebrow at this, but didn't say anything further. They both headed up to the door, fully prepared for someone to grab her spear and tear it down, only for it to be left open. That was unlike Sans, they weren't even there last night!

Papyrus dismissed this though, focusing on the task at hand as he walked inside and headed straight for the dresser, opening up the draw and searching inside. It amazed him how many hoodies and shorts of the same type were in there, did his brother even believe in variety? Grumbling something to himself, he picked out the cleanest pair and handed them to Undyne.

"We better go check if he is still there."

Undyne snorted, "I doubt he would've woken up by now. I'm surprised he didn't use his shortcuts when he was running." She had been told the answer – if he used his magic he may become feral again, or at least increase that chance.

They were both shocked and confused to find the blaster was completely gone. There were burn marks in the ground where he had obviously been blasting. It looked like he had almost been fighting, but there was no trace of another being there. Instead, there was now claw marks where he had been running.

Both Undyne and Papyrus looked at eachother and shared the same word.

"Oops."

"W-WHAT?! Y-you just left him… Alone?"

They had to agree, it was a stupid idea – Undyne was crouched at the first set of claw marks, a phone in one hand and the other placed on the tracks.

"You need to a-after him!"

"How? We would never be able to catch up to him in time, or know where he went." Undyne sighed, "He's surprisingly fast as a Gaster Blaster and if he's gone feral he would probably be using some of his..."

"Shortcuts," Papyrus finished.

"Ummm, okay, l-let me think…. Wh-what if Papyrus turns back into a…. Blaster? Gaster? Dragon? Wha-whatever they are… You can track him… Easier?"

"I don't want to get my battle body ripped in two again!" The tall skeleton whined, stomping a red boot on the ground.

"Then take them off!" Undyne rolled her eyes, before adding - "In the house. Not out in the open."

"Undyne's r-right…"

Papyrus grumbled something inaudible before storming back into the house, slamming the door as he undressed. There was an orange flash behind the door followed by misty magic, then some horrible cracking sounds and a loud roar. Then the whole front of the house split open as the newly transformed skeleton jumped out, skidding across the ground.

"Why did you have a go at Sans about ruining the house when you just destroyed it?" Undyne growled. "This is you're fault, Papyrus."

The skeleton looked sheepish and lowered his head slightly.

Before Alphys could say anything, the fish monster had rushed out some goodbyes and hung up the phone. "Alright, how is this going to work?" She then noticed that Papyrus had his red cape hanging in between his jaws, as he crouched down like a playful puppy.

"You've got to be kidding me."

Moments later, Undyne was sat on the cape now tied around his bony neck as her two hands gripped on the two horns protruding from his head. Papyrus had taken a long sniff of the tracks like a wolf, then was speeding after the apparent direction of his brother. He had much longer strides but bumpy running, which was why Undyne had to grip onto his horns to make sure she didn't fall off.

It took a while before she realised where they were heading – and her stomach dropped.

Toriels' house.

There was some part of the real Sans in the back of his mind – but the rest was completely feral. It was horrific. He was watching himself through his own eyes, but something else was controlling him. He was speeding towards Toriels' house at an impressive speed, and Sans was genuinely scared.

Not for himself, but for Frisk and Toriel.

The beast felt strength gathering in his back legs as he prepared to jump, leaping into the air once he had gotten close enough and just landing on the roof. Claws scratched at the tiles and ripped them off, as Sans crawled around to look for a weak spot to smash through.

Frisk happened to be the one to hear this – he was directly above their room, and they knew this wasn't just a mouse inside the ceiling. Looking up, they squinted their eyes and cleared their throat, preparing to call Toriel to check it out – but were cut off.

Three-way parted jaws smashed through the top of their ceiling, and landed just beside them. Spikes cut through their already injured arm and Frisk let out a cry, jumping back as the predator heavily landed on their bed, the legs snapping and making the whole structure fall to the ground.

"Frisk?!"

No, Toriel couldn't come in here! Quickly shuffling away from the hissing creature, they quickly flicked the lock on the door while it composed itself. They knew their mother would get in eventually, but until then they needed to hold off the beast – they thought Sans was back at the lab? Why was he here? Why was he still attacking them?

Before they could come up with a suitable plan, Sans was now stood up on all fours, blue light gathering in his mouth and ready to shoot at any moment.

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