A/N: Yeah, I'm Undertale Trash... So, anyway, I ended up making an AU. As far as I can tell, no-one has done this. (Probably because this is a bad idea...) but this is the second AU I have made (Not gonna make a fic for my First Undertale AU because it is a bit of a silly idea. Firefly and Undertale? Yep. Not the greatest combination. I mean, I can see Sans being Mal but it is hard to draw other character Parallels. But thanks to my ships, this would mean Toriel is... Inara... Yep. Reasons for this AU not getting a fic should be obvious now.) Anyway, this actually started off as a piece from a RolePlay with a friend that I ended up deciding to turn into an AU. I hope you like it! Also, fans waiting for an update on Sharpness or Sif's Quest to come out, I'm sorry. Sharpness has been delayed due to Minecraft Updates, and Sif's Quest is waiting on other issues... And that one collab... Uh... That's just hard. I'm struggling to get a good start on my part. Okay, I've rambled ENOUGH. Let's just get on with it.

'so, al, what exactly is this experiment?' Sans asked as he stepped into the lab.

'I told you what it was a few minutes ago, Sans!' Alphys replied, frustrated. She'd told the lazy skeleton about the experiment over a thousand times. If she didn't know any better, she'd say he was doing it just to rile her-wait... She glared at him.

'that expression... that's the expression of someone who worked out that i'm trying to piss them off.'

'Yes, and you're d-doing a bloody good job at it!' Sans smirked at her. It was fun to rile up the dinosaur. 'Why do you like annoying me, Sans?!'

'you're cute when you're angry.' Alphys blushed at the compliment, if it could be called that when it came from someone like him.

'Th-thank you, Sans... anyway, just get in the machine and we'll start the experiment!'

The skeleton nodded and complied.

'okay... w-wait a minute... that light shouldn't b-be flashing...'

'i'm sure it's nothing, al. let's just get this over with.'

'Okay, Sans... I-I know you want to get back to Papyrus, but for your s-safety...'

'al, nothing will go wrong, okay? i trust that this machine isn't gonna hurt me, and the sooner this is over, the sooner i can get back to pap... you know he gets grumpy without his bedtime story.'

'Okay, Sans... f-fine...you're right... l-let's just get the experiment done, r-right?'

'right.'

The dinosaur gulped. 'O-okay... here goes nothing!' She hit the button to begin the experiment. 'Please work please work p-please... please let the machine work and not explode!'

Things seemed to be running as they should. Maybe her worries had been for nothing?

The sound of steam escaping rapidly, of crunching and crushing caught her off guard.

'al! you were right! HELP!'

Alphys tried to power off the machine. 'I-It's not responding! Oh g-god...' Her friend could be being crushed to death or something worse, and it was all her fault for giving in! Sans' screams echoed through the lab.

As suddenly as the machine had begun to collapse, it stopped. Alphys looked about. The wires looked like they'd been chewed through. She looked into the corner. Lemonbread stared back.

'YoU oW3 m3...' Lemonbread's voice was echoing and haunting... still as terrifying as the first time Alphys had heard it.

'Th-thank you...' Al whispered. Lemonbread faded away.

The machine opened. Sans fell out onto the hard floor.

'S-Sans! Are you okay?!'

'fine...' Sans whispered. He sounded dazed. Alphys held out a claw to help him up. He took it and let her pull him up. As soon as Al saw his face, she knew something was up. What was with that unsettling red glow?..

'How do you feel?'

Sans hesitated before he answered. 'hungry.'

'Oh w-well... I-I'll get you something to eat. Y-you should probably stay here for a bit...'

'alphys, i'm fine... pap needs me to read to him... he'll be worried...'

'I'll go ch-check on him for you, tell him what happened and r-read to him for you... okay?'

'okay...' It was clear he disagreed. But he wasn't in the mood for arguing. The two went back up to the main lab, also known as Alphys' house. She made her bed fold out, and laid Sans down on it.

'I'll be b-back in about half an hour, okay?.. Don't move.'

'okay...'

She set out for Snowdin Town. When she returned, exactly half an hour later, Sans was gone.