"Come on, come on, come on, let's go to the Waterfall!"

"Alright, alright, we're coming." It was a moment before Sans and Papyrus were exiting their house, Papyrus carrying a small backpack of 'supplies' and Sans wearing a new jacket that was in shades of blue and grey - mostly because Frisk was still wearing his usual one. Frisk was giggling and bouncing at Toriel's side, looking delighted before she gave a pause.

"...Can I bring a friend?" Sans paused, slowly narrowing his eyes as he stared at her for a moment.

"...Who's the friend."

"Yo." Sans was suddenly jumping from the word, glancing back to see the town monster kid beaming. "Frisk said we were going to find Undyne!"

"...Acceptable- ...Why do I not know your name..."

"It's M.K."

"...Ya know what. We're rolling with it. We've gotten this far on ridiculousness. We can probably get a bit father."

"Wow, Sans. Something on your mind?" Sans' reaction was to lift Frisk with his magic, and harmlessly drop her onto a snow pile. A pause and he was doing the same to M.K., who giggled in delight.

"Go eat a snowball, tiny child." Sans paused at feeling Papyrus tug on the jacket, the monster tilting his head at him, Papyrus just tugging a bit more and looking to be concentrating.

Frisk was only sticking her tongue out at Sans as she brushed herself off. "I would, but you never sold me one!" A snort of laughter, Sans brushing Papyrus off.

"First of all, I was going to, but then I figured it was too much effort. Second of all, how do you even /remember/ that. It was literally 80 years ago. Third of all. Pap. Why. Why, bro, why."

"I have not seen you wear this jacket since you were a teen, Sans." Papyrus was tugging again, looking to be concentrating. "You never took it off, and then you stopped wearing it the same day that..."

"That I quit working with Alphys? Yeah. New start, and all that."

"I...suppose that's a way of putting it lightly." Sans narrowed his eyes at that, and...huh. There- It was possible.

"And what's the way of putting it darkly?" They were already walking along the path to Waterfall, Sans still staring at Papyrus because could he be remembering Gaster? It was possible...

"I am...not entirely sure, but... Certainly not quitting." Probable. It was probable for right now, the remembering theory.

"Well, you wouldn't be wrong. Also, you're about to be tackled by a child and have a snowball shoved in your face."

"Get dunked on!"

"Told ya she was my child."

"Ugh. This is worse than when you came home blabbing about how you met a girl who loved your jokes." At that, Toriel was blushing brightly and avoiding looking at them. Sans was only taking Frisk from his brother gently and then throwing him in the river.

"You are no longer my brother." Nodding, he cuddled Frisk and started walking again.

::

"So, you see that, right?"

"Yeah, yeah, I- That wasn't here, before."

"Neither have I, and I've been here a lot more times... Alright, this might be serious, so we have to approach it with the most upmost caution." A moment of silence between them, Sans giving Frisk a shit-eating grin. "Dare you to ding dong ditch it." Frisk ran up to it and knocked on the door, surprised when it opened immediately.

"He did it." Sans stuck his tongue out at the girl, looking as childish as she was.

"Nuh uh. How could I do it when I'm all the way back here."

"Cause you're you."

"You two truly are children." At the voice, the both of them froze and slowly looked in the door.

"...You go in." Frisk probably wasn't expecting Sans to full out tackle Gaster further into the room and to the ground.

Gaster only gave a sigh, looking extremely tired, but also a bit fond. "Honestly." Sans was only quite happy to keep clinging and nuzzling against Gaster, Frisk following them in and hesitating in shutting the door because...it probably wouldn't trap them in forever. Probably. "I'm assuming you found your way alright, then."

"Y- Yeah- Grandpa?" Gaster only gave the girl a smile, easily righting himself and adjusting so Sans was curled in his arms, the gesture automatic and familiar.

"Hello, Granddaughter. I must admit, I didn't quite expect you two to find this door. It doesn't appear very often."

"Yeah, we really didn't expect that- Why are you so..." She gave a vague gesture to all of him, along with a shrug.

"Visible? It's in part to the room, I believe. It's similar to a pocket dimension tethered to the timeline and world you're currently going through. Think of it like a bubble resting against another. Connected, but easily popped. It doesn't form too often, and when it does, I am stuck inside for the short time it is here." A pause, and an amused look. "Also, why are you wearing his coat?"

"One, slow down I haven't had a hundred or hundreds or however many years to learn all that. Two, cause I can." Gaster only rolled his eyes, lightly tugging on Sans' own jacket, which he hadn't seen him wear in a very long time.

"No. I am not releasing you. I am clinging to you for as long as we are in this room." To spite him, Sans clung even tighter, looking very stubborn.

"You know, that explains a lot." Frisk walked over to Gaster, looking him up and down before finally giving a nod and holding her arms out to him. "I demand hugs."

"Remind me again how you two aren't blood related," Gaster snorted, obliging anyways and easily picking Frisk up as well, looking far too used to holding two needy children at the same time. "Honestly."

Frisk only gave a tiny gasp, looking to be in awe. "That's where you got your amazing hugs." She only snuggled closer, happily humming and grinning widely. Sans was much the same, if not a bit more quiet and subdued, Gaster snorting as he settled down against the wall to get more comfortable. He had a feeling these two wouldn't be leaving for a while.

"Huh, never seen this..." Gaster sighed, sounding worn already. Honestly how did these kids get into so much mischief.

"Hello, Asriel." Flowey was then popping up next to Frisk and maybe wrapping a vine around her ankle protectively. "Oh, please, it was only once and I warned you ahead of time what would have happened if you had continued on that path." Frisk had looked startled at the vine around her ankle before she was patting Flowey's head gently, happy to see him.

"You killed me eighty four times!" Gaster only gave a nonchalant shrug, scratching at the top of Sans' head.

"You killed my sons."

"Eighty four!"

"I warned you not to touch them. You were the one who chose not to heed my advice."

Frisk cleared her throat, doing her best Toriel imitation. "Children." It must have been good since Sans had automatically flinched and buried closer to Gaster, Flowey only sinking down a bit and ducking his head. Frisk giggled, looking amused. "I'm the besteriest."

"You're not wrong," Gaster chuckled, ruffling Frisk's hair. "I have a feeling you three are going to be staying here a while, then. Time doesn't really pass outside the door, so you have no need to worry about others searching for you."

"Oh, good. Because you're not escaping. For fornever."

"I figured as much."

It was a good hour or so of conversation, teasing, and catching up on things Gaster might have missed - such as Papyrus joining the journey this time around - before he was tilting his head and glancing at the room. "Hm. Seems the room will be disappearing soon."

"How do you know?"

"Yeah, how do you know?"

"Because."

Frisk looked up at him innocently. "Cause why?" There was a sudden groan between both Sans and Flowey.

"Because."

"Cause why?"

"Because."

"Cause why?"

Ten minutes and Sans was covering both of their mouths, sighing in exhaustion. "How about we call it tie and say you're both stubborn as hell." Flowey had only been banging his head against the floor, trying to lose consciousness.

"He started it." Gaster only rolled his eyes and nudged them all towards the door, sighing at Sans. Who was still attached to his coat. And not letting go.

"Sans. Your wife is waiting on you."

"She is not my wife!" ...Dammit. Sans was sulking fiercely as he was pried loose and set down, and, ugh. Ugh. "You're evil and I should burn this jacket just to spite you."

"But you won't." Gaster smiled as the two headed towards the door, Flowey disappearing back into the ground. "Bye, now." Sans only rolled his eyes and let himself be nudged out the room, hood over his head and /ugh/ he hated the 'byes'. They sounded so...cheery. ...Maybe he shouldn't have worn this jacket. Not considering Gaster had been the one to give it to him and he had last worn it on.../that/ day...

Frisk's hand on the door, she blinked at Gaster for a moment as she started to close it. "Cause why?" With that, she was closing it with a firm snap. A flash and the door was gone, Sans looking to Frisk, the two staring silently for a minute.

"...My child." And, yes. Hug the tiny daughter.

"I won."

::

At hearing a familiar rustle of grass - M.K. having run ahead - Frisk narrowed her eyes before Papyrus was waving and speaking very loudly. "Ah! Undyne! Come meet my human niece!"

"Human?!" Narrowing her eyes at the exclamation, Frisk reached her hand out carefully and ruffled the leaves in front of her. There was suddenly a spear right where the ruffle had been, and, yup. That was Undyne. And Frisk may have given a tiny squeak. Blue stop signs.

"Whoop, there it iiss," Sans muttered under his breath, looking amused. He then glanced to Frisk, grinning wider. "Blue stop signs?"

"Blue what?" He would not win. Sans only snickered under his breath, shifting in front of Frisk as Undyne jumped down, eyes slightly widening at seeing Toriel.

"Your Majesty!" At once, the Captain of the Royal Guard was kneeling. "I see you've captured a human. Do you need an escort to King Asgore?"

"Is this the part where I run," Frisk whispered to Sans.

"Nah, too time consuming," Sans waved off. "Hey, Undyne, this tiny human is my daughter, and Tori's, and we're getting her home, kay?"

"...Wha... Huh?"

"Don't worry about it. But we wouldn't turn down that escort, of course." Since Sans was in the front of the group, no one saw his left eye turn a blazing blue, three large beastly skulls flicking into existence behind the group, pure energy rolling off them. "You're gonna help us, right?"

"Uh, r-right, uh..." She looked over to Papyrus helplessly because what the fuck. Sans should not have that power. And the Queen- His daughter- What was going on?!

"Don't worry, Undyne! You will adjust quickly to the tiny human, she is quite delightful!" All traces of Sans' magic had vanished in a flash, the skeleton looking perfectly relaxed and at ease, tugging the two kids along - Frisk because startlement and M.K. because hero worship.

Frisk easily slipped out of his hold, falling into step alongside Undyne and smiling up at her brightly. "Howdy, Undyne!"

"Hi, ah...human..." Undyne was nudged along by Papyrus, the Royal Guard Captain looking so very confused and lost and...what. The. Fuck. First Toriel returned, then Sans had a daughter?! The human she could handle, Toriel she could deal with, Sans having as much magic as a boss monster she could...start to get a grip with. But him having a daughter?! There was a small nudge at her side, and Frisk was holding out a popsicle to her. She looked completely innocent, only tilting her head to the side, a bit. "...Tha...nk...you...I think?"

Undyne ever so cautiously accepted the treat, glancing to Sans to get a bright smile with blue eyes, and yup. This was suddenly a very delicious treat. At her side, Frisk may have made a small growl and sudden movement, causing her to jump and skitter behind Papyrus. "...I am starting to see how this child is yours, Sans." Frisk only giggled, hopping over to walk beside Sans before attempting to climb him, pulling on his jacket.

Sans looked far too used to the action, letting her get settled on his shoulders before a flick of magic was pulling the hood over her eyes. "Welp, to Alphys we go, then."

"Wow, you really pulled the wool over my eyes!"

"I guess you could say I cottoned on to what you were planning."

"Uuuggghhh."

And the thought of the future and her home once again being so close...it filled Frisk with DETERMINATION.