(Heya heya heya! Back again, and this time I thought of using Sans' timeline abilities for some crossover fun, to connect to my other stories perhaps (maybe even ones I'm still writing). Unfortunately, I can't fit all my story categories into the 2-slot crossover :T But nonetheless! Forewarning, STY belongs to Djsmell, and these characters belong to Toby Fox and Scott Cawthon respectively.)

…..

Chapter 2, POV FP Sans.

Gee. The human sure didn't do too well in that fight. I heard the lady across the door say 'good luck', so that means she at least got away from the little monster (for clarification, Sans has never experienced the pacifist or neutral endings to meet Toriel. Not this one, at least.). It didn't get away from ME though, and I'm going to make sure it doesn't come back. So I wait. I'm gonna fall asleep at one point, but I need to stay awake….can't have a repeat of what usually happens...there'll be no control panel to save me now. But….nobody came. Huh. Guess it knew it was beat once I did this. Guess that means I can head home and hang out with Papyrus, Undyne, and Alphys. Well, I think so. I don't think I can do that with this big, scary thing blocking my path. Looks like a timeline portal, but it seems way brighter and more colorful. I don't want to explore that, not yet. I haven't gone to Grillby's all morning, and it's been a whole 3 hours since I last fell asleep. No way can I just go through, so I walk around it. I hear a weird noise right after that and spin around to something strange. It doesn't seem like a regular monster: it seems oddly metallic and small. Maybe it's a creation Alphys made. To spare myself the trouble of, y'know, walking backwards, I keep walking. Good thing for me, I suppose, that I like to look at the ground a lot, 'cause now I'm seeing a normal timeline portal.

I decide that Sans could maybe use some help. It's really none of my business...and I'll have to feel those feelings of regret, doubt, and unbearable grief all over again. Yet, that's the point. I'll give that Sans a load off. So, since I know what's coming, I drink some of the ketchup Papyrus gave me for Christmas, put it away, and jump on in.

…..

Yup, it's the hall alright. The light fills the room, with the same shadow patterns from the windows as always. And there are those feelings, arising from inside. Temporary feelings, without any purpose to stay within me except to remind me of what's happened and always will. However, the memories I have aren't there. Instead, I'm seeing something...else. My eye's flaring up, great, now I get to relive those memories.

…

Chapter 2.5, POV FP Papyrus.

My cape is flapping against the wind. It's frigid out here, of course, it's Snowdin. The raging blizzard is almost impossible to see through, but I can see them. It's those...creatures. Despite them murdering everyone, they're still cute. I...I still believe in them! No matter what, I KNOW things can change! They can't know what they're doing...they must be confused, afraid, and doing what they think would protect them. I'll show them things can change! I wonder if the purple one is related to Mary (the shopkeeper), maybe the pinkish one was doing those experiments with Alphys. No matter! Now they stand a mere few feet away from me, so here is my time to act and persuade them to be friends with everyone! I see the one with the cupcake is holding something up. Now there's…..a ton of other cupcakes! Wowie! This must be their way of being friends! I didn't even have to say anything! The brown one is also summoning an army of little brown things! They look just like the action figures I have, except cuter! I have to tell..hey! There he is right now!

"HEY SANS! I MADE FRIENDS WITH THE NEW MONSTERS!" I wonder if he heard me, he must have a hard time while running.

"Papyrus, GET AWAY FROM THEM!"

"Brother! That would not be very-"

99999999999999999999999999999999999999999.

Chapter 2.5, POV FP Sans.

Nonononononononno! Those...little shits just...killed him! They just killed Paps...by pretending to be friends with him and...assaulting him. I feel my eye burst into cyan flames, and I feel 10 other eyes look at me. Those cute smiles are nothing but facades! Not to mention that fox one may have 2 heads, but I'll give each the same amount of pain. They approach me, but they'll not get to me. I won't allow them, and show them that by picking up the pink one, using what Gaster taught me...use the particles….

"F-Freddy! What's he doing?!"

ZZKRT! SKCHLSCK!

Guess metal bends easy when slammed into the ground several times. Now that thing looks like one of those experiments that Alphys did with determination. The brown one shouts something, but I never hear it. I'm too busy tossing the pink one to the side, and repeating the process for the other three. Slowly. But no matter how much I want to smash them...it'll never bring Papyrus back. They all seem to be knocked out, or dead, either doesn't matter. I drop to my knees and crawl over to the pile of dust and Paps' battle armor. I pick up the cape he wore like a scarf.

"P-Papyrus...why...why couldn't you see the signs?"

….

Chapter 2.7, POV FP Sans.

Welp. Now I get the gist, and this sounds worse than ever. FOUR little creepy psychopaths? With innocent demeanours and seemingly innocent attempts at friendships...facades for murder. Lucky me, I see them coming now. They look torn, nightmarish, evil... gee, they didn't put their cuteness clothes on today, I suppose. Their looks don't appear hateful, evil, or blank like Chara or Frisk. They seem...entirely the opposite. Like they feel griefed too. But hell like I care. I remember a Sans had actually spared Chara. He didn't get out alive. These things are in MY realm now, and I teleport them to the battle box. But...it's not coming up. I'm sorry, what was that timeline? I can't? And they're in perfect little positions, in a row. I face them all, and look around for the battle box. I see a box looking up. It's a textbox, that says my name...among other things.

"Final Boss, Sans Gaster. Level ?. Attack 1. Defense 1. Dodge INFINITE. Can only deal one damage. Special ability: TIME DISTORTION."

What is this, an RPG? Well, doesn't matter. I'll have to improvise my speech. These kinda look young. Good enough.

"It's a beautiful day outside. Birds are singing, flowers are blooming. On days like this, kids like you...should be burning in hell."

I hear a different theme rather than mine. It'll work, I guess.

"Turn around kids, it'd be a crime,

if I had to go back on that promise that I made for you,

so don't step over that line,

or else friends you're gonna have a bad time."

They don't do anything at first, but then the yellow one throws what looks like a bomb inside of a cupcake at me. I catch it and throw it back, and I see a health bar. It goes down for a few moments until reaching zero, and the thing hits the floor, burnt. I close my eyes and shrug.

"But kids like you don't play by the rules,

and guys like me, it ain't easy to be played for fools,

so let's go, let the room get chiller…" I feel my eye die out, so I swipe my hand over my eye. It activates, no longer on fire, and allows me to see all that I need: the timeline reports.

"LET'S GO, DIRTY BROTHER KILLERS."

I needn't wait long before the brown one, probably infuriated by losing a member of the Quad Squad, sends out a ton of little demonic versions of itself. They never reach me directly, teleporting around things going in a straight line is easy to do.

"Go ahead and try to hit me if you're able," I throw a barrage of bones at them in confusing patterns. To my surprise, they all hit. And to bigger surprise, my Karmic Retribution sure seems to affect them. A lot more than against Chara. I wonder what else these things have done…?

"Guess you've figured out that mercy's off the table."

…..

Damn. These things can SAVE and seem to be as persistent as Chara. My old theme that had practically been stuck in place since the battle had really started suddenly disappeared. Guess it's my turn to monologue some more.

"I can tell you're getting really sick of trying," To which at that point, the brown one falls to a blast from Vulcan.

"...but I think you're just mad you keep DYING."

GAME OVER. Guess they'll come back now. And they do.

"You're not gonna win, we'll be here together,

Fighting in this judgement hall forever,

I know you just reset every time I beat ya,

but I'll always be right back here to meet ya.
I know you're made of-"

And the pink one attacks with some weird wind-up toy before I get to finish.

"Heh. Didja really think that would-"

I should've seen it coming by me repeating that line again. But I didn't expect it to leap over here and BITE ME. Right on the skull and into my right eye socket, too. Ouch.

The thing leaps back, as I get to a knee and hold my right hand over my socket as it 'bleeds'.

"..." I look to them, my appearance of obvious despair visible.

"Welp. You finally got me. Congrats, thought you'd never make it. Well, I guess I'll leave now. I'll get to see them again. Alphys…"

I get up.

"Undyne…"

I start walking away. They watch me, and I notice no satisfaction. Rather. shock. Or is it sadness? Hm. They keep surprising me.

"Mary, Snowdra, the little monster kid…"

I open the panel, as they approach me. Better hurry up, ya bag of lazy bones.

"...Papyrus…"

I open it and am about to press the button when one opens its mouth of sharp teeth. I slam it to the ground.
"You've already tortured me enough. Now, just one piece of advice…"

I press the MEGA button. This GB always resides in the control panel, and I only use it if there's more than one human. It's happened a few times. I feel my pupils disappear.

"RUN."

I press the Consciousness Reset button right as Mega appears, no doubt going to blow a hole in the wall getting rid of them.

…..

Chapter 2.9, POV FP Sans.

That certainly was something. Yet...what were they? I've never seen them before. Why were they here? Sure, we have bunnies and bears and chickens and all that….but why metal little cute ones? And only four of them? Eh, not my problem now. I notice that I seem to be up in the late night, and Sparky is next to me, whining. She never likes it when I lose, because obviously, I get hurt, and like a puppy, who wants their owner to get hurt? I rub between her ears, and that calms her. She licks me and sits on my lap, looking at me. She shows a number in her left eye. 13A7. That's the timeline I was in before that last one. So that's good, I get to see Papyrus' happy face on Christmas morning again. But one thing bothers me. If this is the timeline that I was in, that means that thing will pop out of the portal again. It looked a lot like those monsters from the adventure I just had. But the thing is, those things were clean before I smashed them, and even to some extent afterwards. My question is...\

...why was the thing that popped out so dirty and torn?

(More spoopy. No FNAF characters after this, just wanted to do an RPG character posse against Sans. Next time, we probably delve into one of the reasons I rated this M. Tata~)

"Vultis scire uti ferro? Tormenta sunt nimium faciles. Vos can non sapit omnia...parum affectus. In...videtis supremis, quae vere sint populi."