Author's Note: Huzzah! Look at me! I'm back at it again with the sequel! Like, whhhaaaaaaaat?

I know, I'm being a weirdo. Oh well.

Chara: Have you noticed you're an idiot?

Have you noticed you killed everyone in the Underground?

Chara: *shrugs* It was fun.

=_= Fine, I'll just not deal with you *throws Chara into Horrortale*

So, guys, I'm going to explain some things in the footnote so hang in tight! Footnote? Is that what it's called? I dunno, whateves.

Also, sidenote, if you guys have NOT read Undercross: Strung Up about It then what the seagull are you doing here? Go read that before this! Well, you might not get the references but you'll probably still understand what happens in this story even without reading the last one BUT STILL! READ IT NOW MINION!

Disclaimer: Undertale was created by Toby Fox and any other AU that appears belongs to their respectful owners. I only own the concept of Undercross (UC) and the plot, along with OCs (Original Characters).


Chapter 1: Never Trust a Human

All was going well in the Underground. Frisk was on the verge of completing yet another Pacifist Route. For all she knew, she would be able to decide what happens after saving Asriel without corrupting the Classic!Universe. It was relaxing and yet strangely nerve-racking. Of course Frisk knew what happened the last time she chose to stay with Toriel and even that went haywire.

It took less than a day for Frisk to complete her run but it always felt so much longer. She knew she saw something back in the Ruins but wasn't bothered to check it out. It took two Resets to clean out the universe's code and files but that didn't mean that all the lines of code that was previously deleted was recovered. It was like a teacup: you break it, you put it together, but if you put it together, it'll never be the same as it once was.

Throughout that entire day Frisk was in the Underground she always felt something following her. Watching her. She had an idea of who it could be but even they don't stalk Frisk like that. In fact, Chara's presence was always calming. It meant Frisk had a guide, even if she knows what would happen like the back of her hand.

The run was finally over. Frisk could finally do something new. Something that didn't involve the same thing as always. The last run was proof of that.

"Frisk…" started Toriel. Little Frisk looked up at their unofficial mother with hopeful eyes. She knew the dialogue that was to be said but she was eager to start something new. To try to stay again.

"You came from this world, right…? So you must have a place to return to, do you not? What will you do now?" Toriel asked. Frisk didn't need to think it over; the child knew what she wanted to do. She wanted to stay and try to redo her life in the previous run. She was older in the previous run, about 11, but now she was ten again. How she desired to stay in the Underground with Toriel and have Sans come on Mondays again. For the barrier to be broken, yes, but to stay in Mt. Ebott… Frisk loved it down there.

Frisk opened her mouth to speak, the two options for an answer hovering in front of her, but was cut short. Everyone was supposed to be gone, setting off to explore the Surface, so then why was Sans still staring at Frisk….?

The bag of bones was behind Toriel, distanced of course, but his sockets were blacked-out and Frisk knew what that meant. Was Sans expecting Frisk to say something else?

Yes, he was. Frisk knew it. Frisk knew that Sans didn't want the timeline to get messed up again, like the previous run, so she knew that he wanted her to choose a different option and not stay. It was simple math.

Toriel said nothing of this. The mother didn't know Sans was still there. Frisk fixed her gaze away from Sans and had full attention on Toriel now.

"I want to stay. I want to stay with you. Here. In Mt. Ebott," stated Frisk determinedly. She knew this would anger Sans, or at least disappoint him, but she didn't care. Who was he to control her? Actually, he does have a reason to and Frisk knew it all too well.

Toriel looked a little shocked but Frisk managed to still find relief in the Monster's dark red eyes. The mother smiled, a warm smile, and ruffled Frisk's brown hair softly. The child let out a giggle but her eyes landed on where Sans was supposed to be, only… he wasn't…


Sans groaned as he hung up on the phone. Less than a week after Frisk completed her run and Sans was already assigned babysitter duties on Mondays. Again…

He loved Toriel, that was a fact. He would gladly do any favor for her, as any friend would, but there were times where he felt like Frisk controlled her too much. Honestly, what was the kid thinking? Mondays were the worst days of the week for Sans and Frisk knew it. They both knew that "last" Monday was a Gaster Blaster disaster and definitely made Sans, and the other versions of himself that he met, Gaster Blasters disaster casters.

Now, it was Monday again and guess what? Toriel called at the last minute ask him if he could take care of Frisk on Monday mornings. As lovable as the kid was, Sans was usually fed up with her.

It'll only be quick. Just the morning. Past the Ruins door. Look at you! Exploring the ONE part of the Underground that you don't know.

Sans grabbed his hoodie from the couch and started off on his journey from his house in Snowdin to the Ruins. It usually takes a good 30 minutes to an hour at most to get to the Ruins from Snowdin Town but Sans didn't complain. He would usually teleport to the Door.

In fact, he did teleport to the Door, just to save time and be lazy. Papyrus would complain; he never liked that Sans can teleport. Sans chuckled softly as he imagined his younger brother's reaction.

"YOU'RE SUCH A LAZYBONES!" Papyrus would yell. It never bothered Sans, it amused him. Even with so many Resets, Papyrus would always be his sunshine.

Snowdin Forest seemed colder than it usually felt. Not that Sans can actually feel the cold but something about the day seemed off. It could be one of the many missing pieces of code that Frisk couldn't restore or maybe, just maybe…. No. Sans pushed away the thought. He didn't want to deal with those other versions of himself again. Fell was a pain, Ink was a nuisance, Blue was fine, but Geno… Well, Geno was the only one Sans actually liked.


Sans knocked on the door, "Knock, knock."

"Who's there?" answered a soft but fierce voice from behind the door. It was like a mother, soft but fierce.

"Orange."

"Orange who?"

"Orange you glad I'm not late?" Sans didn't laugh this time. He used the same pun before, in the other timeline. It wasn't amusing anymore, to Sans at least. To Toriel… Well, it took her a moment to respond.

It was strange. Toriel never responded late to a pun, or any joke in general. Sans had a bad feeling about it but then again, Sans always had bad feelings about everything.

After a long moment of awkward silence, Toriel finally responded, "O-Oh, yes! Hahahahahahahaha…" It wasn't a cheerful laugh. Not good.

"Tori… you alright?" asked Sans. It took him a lot of courage to ask her that. He knew the obvious answer but he also knew the reason why.

"Hm? Oh yes, Sans. Sorry, I did not mean to worry you. Heh, heh, silly me, lost in my own thoughts. Oh! Here, let me open the door for you. It certainly is warmer in the Ruins than in Snowdin," said Toriel. The gigantic, purple Ruins Door slid open, creaking as much as stone could possibly creak.

Toriel smiled kindly, "I did not mean to call you on short notice, Sans. I, myself, had only just discovered this."

Sans nodded silently and walked in. He didn't know what Toriel was talking about but he knew it should be surprise. Whether a good surprise or a bad one was for him to see.

The first room in the Ruins was dark, with only one patch of green grass in the middle. Of course Sans knew who it was for, and God, how much he hated that flower. Even if he is Asriel, Sans still hated that flower.

The long hallway and staircase to the main room of Home was a long walk with Toriel. It was mostly silence with the occasional disturbance: "Oh, I should tell you that Frisk is doing fine. You haven't visited in a while, Sans," this and Sans that. Frankly, Sans loved the goat-mother but he was not in the mood of talking, even small talk. After the last Reset, he was more cautious and suspicious than ever before, that with keeping an eye out for that second anomaly Geno warned him about.

"Sans, we need to talk," stated Geno in a low voice, almost a whisper. He grabbed Sans' arm before the skeleton could leave. Geno didn't look very happy.

"Shoot," responded Sans in the same low volume.

"Chara… Keep an eye socket on that kid, Frisk I mean. I've dealt with the megalomaniac before, don't get attached to Frisk this run," warned Geno. His only usable eye was his magic eye but it didn't black out like Sans' would when he was this serious. It glowed a faint red and blue, not that bright, not the powerful…

"Frisk ain't Chara, bud. I'll tell you when I don't keep an eye socket out for them," said Sans. He answered in the same threatening tone as Geno had spoken, even if more threatening. Sans almost growled.

Geno hesitated but then nodded, "Only warning ya, pal."

Home looked the same as ever, not that Sans had ever seen in person but New Home was supposedly designed to mimic that of the house in the Ruins. Sans only knew that Toriel had called about a human. Who the human was had only one possible answer: Frisk. Other than that, he didn't know why Frisk hadn't already run up to him and hugged him when he entered the main room. No kid in sight, only Sans and Toriel in the living room now.

"Sup, Tori," greeted Sans over the phone.

"Oh, Sans! Hello," answered Toriel, "Sans, I need to ask you of a favor. Do you have time today?"

"Yeah, Tori. What is it?"

"I need you to take care of a human for me today-"

Sans nearly dropped the phone. Of course Frisk wanted to try this kind of lifestyle again from the last timeline. Of course; that's just how the kid is. Sans didn't expect the Monday babysits so soon though. It had only been a couple of weeks.

"Sans? Sans, hello, are you there?"

Sans blinked back into reality, "Huh? Oh, yeah, I'm here, Tor."

"Oh well, I believe it is only going to be for today. I have to buy groceries in Snowdin so it might only take little but I still want someone to watch over them."

"Yeah, yeah, sure, Tori," agreed Sans.

"Sans, could you be a dear and check the kitchen quickly? I'll check the rooms. The human does not seem to be here already," requested Toriel. She looked a little worried, probably concern for Frisk, so Sans nodded in agreement.

As promised, the skeleton moved to the kitchen. The area was tiny, only room for a handful of people, but in one glance you could see if someone was in there or not. There was no one in there. No human, only the plain kitchen.

Finding no one in the kitchen, Sans poked his head out from the doorway to see if Toriel was still busy. No in sight outside of the kitchen either.

Welp, might as well help myself, thought Sans. He popped back into the small kitchen and opened up the fridge. There they were: the row of approximately ten bottles of ketchup Toriel always saves for Sans. The skeleton took a bottle of the red condiment and started gulping it down, all while making one last check to make sure Tori didn't catch him.

Already having drunk two bottles of ketchup, Sans decided to stick around the living room while waiting for Toriel. There weren't that many rooms in Home so he didn't know why it was taking Toriel long. Frisk could be trying to play hide and seek again though. That was a possibility.

The living room was homely. The warm fire was still going in the fireplace, making Home feel cozily warm, the perfect temperature for a nap. The large chair for Toriel seemed fluffy, and the dining table was large. It was exactly like New Home but that wasn't what made Sans somewhat uneasy. No, it was what happened last timeline that did. The blue strings… The knives… The disappearances… Having to hang out with Fell… Yeah, the last one was probably the worst yet.

For some reason, there was a large window over the dining table. It had a small still under it with a flower pot on it. Inside the pot, a yellow flower had its back to Sans.

As Sans fixed his eyes on the flower, deciding whether it was just a normal buttercup, the world went dark and black. Everything dematerialized around Sans. The skeleton wasn't surprised. It was just another Reset, which meant that he had to live through yet another run. Resetting this early was unusual for Frisk. The kid often Reset after a good amount of months after the Pacifist Route was completed.

But yet, Sans was surprised. He was surprised because he didn't wake up back in Snowdin. No, the world materialized again and he was in the same spot he was in Home. This confused him.

Why would a Reset glitch like this?


A/N: So, I know that most of your guys are probably going like: "But, Soph, wait! How could you possibly make ANOTHER Undercross story? Didn't everything get closed up in the last chapter of UC?"

Answer: No, not everything was filled. I left some mysteries in there along with some, uh, hints? Probably hints. Most likely hints. But yeah, hints! Basically, this second story has a new story-line with, of course, new characters and returning ones. Like, I dunno, SANS? Uh, maybe GENO? He "appeared" in a flashback so I guess, yeah, him too. And, uh, some surprises that might have not come as a surprise.

See ya guys in the next chapter then!

DON'T FORGET TO REVIEW GUYS, I LOVE IT WHEN I KNOW PEOPLE ACTUALLY LIKE THIS (OR DISLIKE THIS).