Undyne narrowed her yellow eyes at Papyrus, her hair thrown up into a lazy ponytail behind her head. She didn't seem happy, and she wasn't.

After encountering that, Papyrus wasn't sure how to react. She had likely killed someone, if the blood was anything to go by. She had snuck out of his house in the middle of the night, used a scalpel to kill someone, then tried to sneak back in and hide the evidence.

He didn't know how to feel. It was a little girl, it was Sans' child, and she had done that. Was there a reason, was it just because? How would she even know how to do that, or how would she even be able to? Papyrus couldn't exactly report her to the police, and he didn't want to. Instead, he forced down his worries and offered to start up a bath for her to wash it off.

Washing the scalpel in the sink made him sick. Washing the blood soaked clothes was hard, especially when Toriel had awoke to find that.

And here they were, the next day. Papyrus couldn't hide this from Undyne, but maybe he should have tried. Undyne didn't go and report this to anyone, thankfully, but she had come over. Which Papyrus didn't want to happen.

They had all watched the news that morning. A woman, who lived down the street from Papyrus, had been murdered that night. The report detailed how her throat had been slit in her sleep before her stomach had been cut open, some of the organs removed and her liver having a bite out of it. Toriel and Papyrus had both looked at the girl when this report came on, and she hadn't looked back.

Did she... eat her organs?

Papyrus didn't want to think about it. He really didn't.

That was why Undyne was there. She had been the one sent to ask around the town for any sightings, which she had done earlier. The fish monster had asked everyone earlier, but she wouldn't be asking Papyrus. No, she was at his house for a different reason.

Everyone had already agreed with one another that this girl wouldn't be ratted out to anyone except for their circle. No other monsters or humans would know she existed until Papyrus knew the situation, and no one would talk about her being bloody, either.

"Why can't I at least see her?" Undyne asked.

"You might... you know, scare her!" Papyrus explained, "She's already scared enough as it is, and you look kind of... frightening. That's why I'm not bringing Asgore, either, because he might scare her, too."

"You know I'm not just spears and fighting, right?" Undyne asked, "Kids even like me, they say I look cool. I don't think I'll scare her. I don't want her to run as much as you do, but I should at least be allowed to help instead of you kicking me away."

Papyrus groaned. "I-I just... you know! I really want to do this right, I want to help her!"

"And you a-are!" Alphys said, "But y-you can't do this all y-yourself. Let us at l-least try to help!"

Papyrus glanced back to the direction of his living room. He just wanted to help the girl, to understand her. If he accidentally screwed this up, as he did before, he would have failed not just her, but Sans too. Papyrus didn't want to fail, not again. He wanted to help her, he really did, but he didn't know how. If she talked to him, maybe he could understand, but she wouldn't.

The only two reactions he had really managed to see from her was when he asked about Sans and from the news that morning. When watching it with her, the girl had first looked away when the bit about organs came on, but when there was a report of a dead body found covered in candy wrappers, she had looked back eagerly at the T.V and even started clapping.

"Fine," Papyrus sighed.

Allowing them to enter, Papyrus walked them to the living room, where Toriel had been talking to her about how she liked her hair. It was nice magical hair, only girl skeletons obtained the gene.

The girl immediately reacted when Undyne stepped into view.

Her eye sockets widened when she glanced at her, her body plopping from the couch onto the floor as she scurried out of her seat. Papyrus was afraid that Undyne had actually scared her, and was about to turn around to shoo her out, but was proven wrong when the girl instead walked towards Undyne.

Grabbing her hand, the small skeleton pulled at it a few times, looking up at Undyne with a pleading look.

"I don't... what?" Undyne asked.

The girl than shifted her pull as she pulled at Undyne's hand to the side, trying to lead her out of the room.

"Do you want me to follow you?" Undyne asked.

The skeleton nodded, pulling further on her hand. Undyne gave a look to Papyrus of confusion before she decided to follow, leaving the room and leaving them all in silence.

"I guess U-Undyne is good with kids," Alphys muttered.

~~~~~~

Undyne didn't expect this.

Standing in the small room down the hall, the child had turned towards the door to slide it closed behind them, making sure they hadn't been followed.

She recognized the black liquid from the girls eyes, she would remember that anywhere. It may have been so many years ago, when Undyne's house had been invaded by those CreepyPasta, but she would never forget it. That blue mask, with that leaking liquid. It was the same liquid as was leaking from the girls eye sockets.

This girl, she was the child of him, wasn't she? Undyne could still remember that day, clear as could be. How the man had carried Sans tenderly, had watched him being healed carefully. He loved him, it was obvious now. Sans and him had a child together.

Just then, the girl turned around to face Undyne, Undyne straightening. How come she had led Undyne out of the room? Was there a reason? Why Undyne of all people?

Undyne didn't know much about the girl, but no one did. They didn't know her name, and they could only guess as to why she came to Papyrus.

"I..." The girl started, her tone light and fragile.

She was talking? She hadn't talked for over a day and now she wanted to talk to Undyne?

"Um, well, hi," She squeaked out, "I uh, can actually talk to you. W-Well, I could talk to everyone, maybe, if I was comfortable with them. Uh, probably not. Well, um, kinda... yeah, I can't really talk to people."

"Wait, what do you mean?" Undyne asked.

The girl looked timidly up at her. "I uh, kinda forgot what is was called, but I can't talk to people. I mean, I did want to. Like, a lot. They all seem nice, but sometimes it just feels like I uh, can't really. Kinda yeah, I wanted to talk to Miss Toriel, but it just... doesn't happen. But I can talk to you, uh, a bit."

"How come you can talk to me if you can't talk to them?" Undyne asked.

"Um, well," The girl rocked back and forth on her toes and heels. "I dunno what it's called, um, something about mutism, it makes it hard to talk to people unless I feel comfortable with them. Or, um, if they, you know... kinda killed someone before."

Undyne blinked. Was she suggesting...?

"O-Oh, uh, so pretty much talking to normal people like, uh, them is hard for me. Usually I-I can if I feel like, comfortable with them, like some of my family. But Mr. Papyrus and Miss. Toriel I can't really like, talk to, sorta. And I can talk to you because, well, uh, you've... did- wait, done it before. Um, like, kill."

Silence filled the room. Undyne felt uneasy with the girl looking up at her, asking, "How could you tell?"

"I-I didn't mean to uh, like, offend, or something," The girl said, her face filling with worry. "I just, um, can tell? Sorry, uh, I'm not saying that's wrong or anything, that you've done that. I can't really talk to other people unless they've killed, so um... yeah."

Undyne wasn't exactly one who liked to talk about it much. It had been so long ago, in the days of the underground. It was how she lost her eye, she had been careless. Humans were stronger than she originally thought, and that lesson had taught Undyne why she couldn't rush into battle without being careful and without a reason. Sure, the fish monster tended to be loud sometimes, but losing her eye helped her realize where she went wrong before. And it taught her just how desperate someone could get when their and others lives were on the line.

"So you can just look and tell?" Undyne asked, "And that's why you couldn't talk to Toriel and Papyrus, because they haven't killed anyone before."

"Kinda, yeah," She said, rubbing her wrists. "It's uh, kind of a problem. They're both really nice, uh, the people out there, I mean, but I can't really talk to them. Um, yeah."

Undyne nodded. The girl looked a bit nervous, but she didn't seem as frightened as before. Not only that, but she was also talking to Undyne. And if she could tell that Undyne had killed someone before at first sight, then the kid probably wasn't lying. And Undyne couldn't really interrogate some kid, she hadn't done anything wrong.

"What's your name?" Undyne asked, crouching down to her level.

Her soul hurt from the memories of the battle. She didn't want to think about it, not now. The eye patch over her eye felt like dead weight.

"Addy," She said, "And you, Miss?"

"Call me Undyne," Undyne said, "And you're a skeleton, so that means you're Sans' kid, right? Papyrus told me."

Addy looked to the side. "Uh, yeah, he's my Daddy..."

"Why did you come here?" Undyne asked the girl, "You came for Papyrus, right? Did you know he was your Uncle?"

"A bit, yeah." Addy seemed more nervous, twirling a piece of her purple hair between her fingers. "Um, Daddy didn't like to talk about him much, though. Uh, I just came here because... I didn't have anywhere else to go."

"What do you mean?" Undyne asked, "What about your Dad, Sans?"

"U-Uh, he just... didn't come home one day," Addy explained, her voice trembling. "We waited and w-waited... and he just, um, wouldn't reply to anything we sent... then the bad people came and uh, um, I'm... a-alone."

Undyne narrowed her eyes as she tried to figure out what to say. So Sans just disappeared one day, then bad people came?

"Who are the bad people?" Undyne asked.

"I didn't, uh, see them," Addy mumbled, "I just heard noises and, I mean, it was scary... Dad, my uh, other Dad, gave me my scalpel and told me to run while he went back to go help... then he didn't come back, a-and..."

Then she burst out crying. Large tears rolled down her face as she hiccuped, burying her face into her hands. Her crying was loud, wails filling the room as Undyne froze, unsure of what to do. She wasn't good with comforting crying children, usually Toriel was. Undyne wasn't a kid person!

"Hey, hey, it's going to be alright," Undyne said quickly, resting a hand on the girls shoulder. "We're going to find your parents, don't worry."

"B-But everyone is gone, and I-I can't even talk to people!" Addy cried, "I just wanna see D-Dad again!"

"And you will, don't forget you have us here to help," Undyne said, "We're going to find your family, trust me. Can you tell me how long ago that was?"

Addy hiccuped. "Daddy went away t-two weeks ago, and the bad people attacked, um, a few days after."

Undyne stared at her with shock. This child had been on her own for over a week, with no one to turn to?

"Did you find anyone you know?" Undyne asked her.

"No, I saw Mr. Papyrus and I figured he was, uh, y-you know, my Uncle... and I followed him here..." She explained, "I know Daddy told me to s-stay away from him but... I was so scared, I-I just wanna see my Dads again... or anyone..."

"Don't worry, we'll figure something out," Undyne said, "We'll find your family and stop those bad people, okay?"

"P-Promise?" Addy asked, sniffing again.

Undyne nodded. "Promise."