#GASTER | Explore Tumblr posts and blogs

gabriel-xander · 3 days ago

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Don't Forget

[Sans x Female!Reader]

36: Alright, Dude. What. The Flip.

♪────✿⁠(⁠✧◕⁠ᴗ⁠◕✧⁠)✿⁠────♪

When Gaster appeared in your dreams like this, he wasn’t exactly expecting a warm welcome or anything like that. Maybe a scream or a jump, something to spook you a lil’ as a little late-night trolling.

What Gaster wasn’t expecting was for you to immediately shout profanities at him.

He stands there awkwardly like the man-standing emoji.

🧍

All he can do is wait and twiddle his thumbs as you call him a beta bitch for the 17th time in 39 seconds. He almost wants to cry; why are you yelling at him? Is this really Sans’ type? Is this what the kids are into these days?

You stop pacing around in the endless void that is your subconsciousness. Putting your hands on your sassy hips, you look at him with an irritated and expectant look.

“Well?” You huff, “What the hell are you doing here?”

“…Are you done?” He asks.

You noticed that as he was talking, his hands (God, it’s so freaky. He does not have arms and his hands are not attached to his body. Seeing them with holes in the palms in person is a lot scarier than you thought it would be.) twitched upward, almost like he wanted to talk with them. You can somehow understand him now, but maybe he would feel better with some help?

Bringing your dominant hand up in a fist, you move it up and down in a nodding motion. “…Yes.”

“Thank you.”

He moves his left hand up to his mouth, palm facing his chin, then brings his hand outwards. The motion can be similar to blowing a kiss, but you know it’s sign for what he just said.

Looks like Gaster would much rather prefer speaking in Sign Language. That’s fine with you, you don’t mind having to do so for his comfort. It works out for you, too. Just because you can understand him now, that doesn’t get rid of this strange gibberish sound that seems to follow closely after his words.

Gaster continues to talk, and at the same time, he keeps using sign. “You should already know who I am.”

You snort, doing the same, “Yeah, that’s why I asked why are you here, not who you are.”

“…Oh.”

Nuh, God. This guy is so much like his son. A fucking dork.

Gaster is… not what you were expecting. His body is tall, probably over 7 feet tall. He’s almost lanky in stature, hunching over but you don’t think that’s of his own will. There are parts of him that are smokey and wispy, almost as if he’s incomplete (which you suppose he is…).

[ Despite being a tall bitch yourself, this guy still managed to be taller than you. / You’re considered to be average in height, so this man easily has height over you. / You’re already struggling in life being short, so imagine your horror when this monster is practically a fucking mountain compared to you. ]

His skull is not skeletal but the visual texture is similar to Sans’ and Papyrus’. Aka: bony as fuck. His right socket is normal and wide naturally, while his left eye is droopy in a forced-shut kind of way. The crack that starts on the tip of his head leading to his left socket is what forces it to be half-lidded.

His smile–his beautiful, baby boy smile–freaks you out the most.

He doesn’t have lips, no. But yet you can’t see the joints of his jaw the way you can with Sans and Papyrus. It’s almost like lips, but you know it’s not supposed to be.

Perks of being a monster, you suppose.

His drip is fucking immaculate though. A pearl-white turtle neck shirt that’s thick and hides his entire neck. Over that is a large black coat that closes low on his chest, dragging down to the floor hiding his legs and feet.

On top of all that, his voice is deep and silky. His tone is even and calming like he has it all figured out and everything will be okay.

Solid 8/10 in your opinion. You can see where Sans and Papyrus get their good looks from considering Gaster made them.

“Before we go any further,” Gaster clears his throat, “can you understand me just fine?”

“Oh, yeah,” You tilt your head, “How–How are you doing that?”

“I’ll answer your question another day when you are not about to shout profanities at me for the most minor of inconveniences.” He says with amusement.

…Okay, fine. You guess that’s fair considering what happened not even two minutes ago.

“Yes, I can understand you even though you’re speaking in Wing Dings. Using ASL is helping a lot, though.”

He chuckles at this, “How did you know to use sign language, if I may ask?”

You scrunch up your nose, “I remember the River Person mentioning a man who speaks in hands. Honestly, it was just a shot in the dark if sign language is what they meant.”

“Ah, I see. That’s right, isn’t it? You are aware this is a game,” Gaster smiles ominously. “That Undertale is a game.”

“…”

“Yeah, but…” You frown comically, “I’d rather not think too hard about it if that’s okay. Or what it means for me. Or what it means if it is a game, how I can possibly be here in the first place. Or what it means that this is all a game, how can I possibly be in different Au’s-”

“-Sorry, sorry. No need to spiral so casually. Let’s move on from that topic,” Gaster clears his throat again. You wonder if speaking might be too much for him. “That aside, how are you, [Y/n]? I know this must have been a long, tiring day for you.”

“Uh, yeahhh. I can’t lie, it’s been hella overwhelming.” You want to rub your cheek, but stop yourself since you are still signing as you speak, “I’m trying to push it down the best I can and not make a big deal out of it. I mean, I literally fucking jumped into an Au! How am I expected to just keep calm and act like this is nothing?!”

You continue your ranting, your hand movements getting messy as you begin to pace, “Oh, but I gotta keep my shit together whether I like it or not! One moment of complacency, and this Swap-Papyrus is gonna Divine Skeleton Death Blast us to next Friday! For some fucking reason, everyone’s got beef with poor baby Sans! I already gotta be this picture-perfect version of myself, that is sooo tiring, you know?!”

Gaster, that beta cuck, starts to laugh at you!

Another hand is summoned by him, identical to the other two he already had out. The hand is used to poorly cover his mouth to muffle his laughter. He’s not even trying, but you guess it’s just for show to appear polite.

Yeah, you’ll take it.

“It can be rather bothersome at first, yes. Though, you will soon get used to it, and possibly tired with it, too.”

You want to cross your arms. You already know that you cannot.

You even out your voice so you don't sound irritated, “It’s great to officially meet you, really. But I have to ask again, why are you here?”

Another hand appears; now a pair of hands are used to sign, and the other pair is used to straighten out his coat.

“Do you mean as of right now, or is the question deeper than that?”

“You know I mean more than just right now.”

The skeleton sighs, “I’ll be happy to explain it another time, but now is not it.” Before you can ask why, Gaster speaks again, “You will wake up from this extremely tired because of our conversation. Your body is asleep, but your mind is not. The longer you’re awake in this way, the less rest you’re actually getting.”

UGHHH! FINEEE!

“Okay, okay.” You sulk your shoulders dramatically. “I know how to be patient.”

“Do you really?”

“…”

Gaster chuckles, “My apologies.”

“…You’re not sorry.”

“I am not.”

Fucker.

“Okay, okay. Let’s focus,” You wave your hands then remember immediately you’re not supposed to do that. Damn, you need to get used to speaking ASL as you talk. “Is there a reason why you showed up now of all times? Please just tell me.”

“You’re quite straightforward. I like that.”

Slay.

“If it’s all the same to you,” Gaster begins to explain, “I’d rather not give you the answer right away. If I wanted this journey to be simple for you and Sans, then it would’ve been simple from the start.”

You deadpan.

“Don’t you youngsters enjoy adventure?” He asks genuinely.

You drawl out your words, “I meannn, I guuuess. But if the moral of the story really is “friendship was the answer all along…”

You trail off, and for good reason. Despite his simple face, Gaster looks rather sheepish and nervous.

“No…” You slowly shake your head, “Ain’t no fucking way…

“Do you remember how you told Sans earlier that you believe being honest with that version of Papyrus had worked out better for you?”

Bro.

“Dude, no way. So you’re saying we actually need to befriend these people?” You narrow your eyes, hand movements getting, admittedly, lazy, “I knew I was having a weird feeling about that the whole time! That was you, wasn’t it? That feeling was intentional.”

Gaster’s extra hands begin to rub each other out of nervousness. “I want Sans to make friends…”

…

Dude…

You’re so fucking done. This guy is a fucking dork-enormous.

You guess it’s cute that even in these circumstances, Gaster is like an anxious dad wanting to make sure his emo son isn’t emo for life. You’re guessing that it’s not actually necessary. Rather, Gaster will offer more help once you meet these “requirements”, similar to how he made the DJ work only until after you were honest with Sans.

Gaster continues when your defeated expression doesn’t change. “That is not all, of course. Please, allow me to explain some more to give you more background.”

You sigh and gesture for him to keep talking.

Clearing his throat, he asks, “How much… In regards to my past and how I became this way, how much do you know?”

“Ehhh…” You twist your face trying to think, “I know more than the average person, I think. You created the Core, and… the DT Extractor?”

The corner of his mouth twitches upwards, “Yes, that’s correct. Is there anything else you know?”

“You… “fell into your creation.” You put a hand to your chin, “According to Sans, you also created him and Papyrus. I know that you’re–were the Royal Scientist, too.”

“Yes, you are correct.” Gaster sighs heavily, body language and tone becoming exhausted, “When I created the Core, I made it with more than one purpose in mind. The first and main reason behind it being to provide magical electricity to the entire Underground.”

“It does more than that, of course. Because of the ozone being a byproduct of electrical power–Well, you’ve seen it before, right? That wolf who throws ice into the water–the ice reaches the Core to cool it off. Since the ice melts once it gets close to the Core, the ozone fuses with it and it becomes a source of ozonated water. This spreads throughout the Underground, infused with its natural magic. Because of that, it can clean clothes, sanitize food, and purify drinking water. Really, the Core is almost perfect.”

Gaster stops talking abruptly, looking at you with an almost embarrassed smile. You were patiently listening to him ramble on, nodding along with interest. He realizes that you probably barely understood anything he just said. (You didn’t understand shit, but it was endearing to listen to him regardless.)

“A-Anyway,” Gaster coughs weakly, “I thought at the time if I could extract raw power from the Core, perhaps with that power I can begin a new experiment that would allow me to research ways to naturally break the barrier without human souls.”

“I did not get very far, as you are aware of. I made a miscalculation and fell in. I could explain to you why it happened the way it did, but to be frank I am not patient enough to explain it in a way you’ll be able to easily understand. Just know that it resulted in my body being torn apart and destroyed on the spot. My soul was all that was left, yet that too was scattered across space and time.”

You don’t really know what to say to that. What can you possibly say? What words could you possibly give that would give any sort of comfort to someone as tragic as him?

“I…” You gnaw at your bottom lip, signing meekly, “I’m sorry that happened to you. It’s not my fault, I know I don’t need to apologize. But–you know what I mean.”

Fucking nailed that shit (you’re going to die of embarrassment).

Gaster smiles appreciatively and with amusement.

“For now,” He goes on to say, “all you need to know is that, yes, I waited for you to tell Sans about your knowledge of myself, and your knowledge of the Resets and Saves and whatnot. I waited only until then to turn on that machine myself. I believe you and Sans are calling it the DJ?”

You grin, “Great naming, right?”

“Indeed it is. Though if I may be honest, Sans is very much capable of doing all of this on his own. He doesn’t necessarily need your help in going to the different Alternative Universes and timelines.” Gaster shakes his head, “But I quite enjoy that you’ve made friends with him, and you’ve lifted his spirits a lot. I know Sans, and I know his way of thinking. If I made it so that you are “necessary” to be involved, Sans would believe it is intentional and allow it to happen.”

Ah, you think you get it now. Gaster used Sans’ belief that nothing (especially things involving Gaster) is a coincidence to make sure that Sans would keep you around for this adventure Gaster is putting you through. You think it’s really sweet, in a way. That even though you’re here to do something for the scientist, it’s ultimately for the betterment of his son as well.

…You wonder if you should mention to him that you’re… super friendly with Sans. Now probably isn’t the best time…

“You know, you weren’t far off the mark with that. Sans already thinks that you’re doing all this in this specific way on purpose,” You tell the monster, “It’s nice you’re looking out for him still.”

“And that is why I would ask you to keep this part a secret. If he knew that he doesn’t need to bring you along for future outings, I fear he would leave you behind.”

You nod, “I’m not a fan of lying, but… I guess I can make an exception for this. And… Yeah, okay. Despite all my bitching from earlier, I do like the adventure.”

Internally, Gaster is fucking stoked. So he was right! The youth does yearn for adventuring! That means he’s totally still hip with the kids!

“So, back on track!” Gaster claps his extra hands together, “I have been scattered across space and time, including the Alternative Universes and timelines. The original piece of me is still in our original universe, of course. But aside from that, the largest scattered piece of me is right here in… What did you call it before? Underswap?”

“Ahhh!” You nod eagerly in realization, “So that’s why you wanted us to come here first!”

“Yes, exactly!”

“And, that also means there are definitely other Au’s after this one that you want us to visit for the same reason! We’re finding these pieces of you and we’re putting you back together?”

Look at you, you smart fucking cookie!

“Right, again. What you did today, the way you will eventually find this piece of me, this is what you will need to do as well in the other Alternate Universes.”

Gaster uses one free hand to rub his chin in thought, the other hanging in the air, “Admittedly, the location of each piece will be different each time. Moreover, the effect of my fragments will have different effects as well. This one just so happened to cause a disturbance in the magic that affects the monster's emotional and cognitive health. Unfortunately, this is something I genuinely have no control over.”

You cross your arms and look down, “How do we even find your fragment? I mean, what does it even look like?”

“All of my fragments will look vaguely soul-like. I believe you will know what it is once you find it. As to where and how to find it exactly, not even I am 100% certain.” Gaster grins teasingly, “Well, no. That is a lie. But I’m confident you will be able to find it yourselves.”

You deadpan. Again.

This motherfucker.

Are you supposed to love or hate this guy? Or both?

“Now that you’re informed of all this, I will allow Sans’ device to work again. I believe that will also be what helps locate my fragment.”

“Wai-wai-wait. You made it stop working on purpose… just because you wanted to prolong our stay… just so you could talk to me tonight and tell me all of this? Just so I can make sure Sans makes friends before we finish the job?”

“Yes.”

…

DUDE.

You don’t even know what to say. What do you even say to that? How should you feel about this shit?

You groan and hide your face in your hands, “Why can’t bitches just tell me the answer? Why do people gotta make things harder and make us solve puzzles and shit?”

Gaster hides his mouth behind his hand, hunching his shoulders in a silent, mocking laugh.

Brother really said teehee.

Is this where Papyrus got his love for japes and puzzles and crap? Both he and Sans are rather cheeky, too. Motherfucker really is their dad.

You roll your eyes. You realized just now that you stopped using sign language a while ago. You feel guilty and hastily move your hands again before asking your next question.

“You know I have to tell Sans all of this–most of this when I wake up, right?” You frown, “I did promise him that I would whenever you are involved.”

“Yes, I know. I did this with that in mind, after all.” Gaster then smirks smugly. Somehow. “Tell Sans I said hello, yes? And congratulations on the relationship.”

“…”

“…Okay, I will.” You say casually, “Wait! Wh-What about the Swaps? I mean, if they know why we’re here and how we got here… Sans was saying how they might make him fix their machine, too.”

“I don’t think so,” He says quickly and confidently, “Once the Swap-Papyrus realizes exactly what is going on, I have a strong suspicion that he will most likely be eager to have you leave as soon as possible. In terms of the timeline, this is way before your swap version would “canonically” show up. During this time, if we were to mirror our Sans, this Swap-Papyrus will be too nihilistic and pessimistic to want anything to do with these things.”

Gawdamn, bro is roasting Sans and Swap-Papyrus in one go. This Sans slander must be stopped.

“Oh? So, there is time travel technically involved in all this?” You ask worriedly. “Is-Is that safe?”

“…”

“???”

“Ehh, you worry too much.”

You’re going to cry. This is karma for cussing him out, isn’t it?

“If I am being honest with you, it is not wise. But, it certainly won’t be harmful to you,” Gaster waves a dismissive hand, carrying the attitude of a confident scientist who isn’t aware his hubris will be the death of him. “Unless I suddenly and explicitly tell you otherwise, you shouldn’t worry.”

Wait a damn fucking minute!

“Don’t–Wait!” You frantically wave your hands, “Doesn’t this mean we might possibly visit an Au where I’m already there?!”

Gaster fucking giggles at you! He fucking giggles! What the fuck!!

“Until next time, [Y/n].”

Then there is nothing.

…

There is nothing until you wake up in total exhaustion.

You are immediately aware of what you were dreaming about, and remember the conversation you had with clear memory.

Sans is still sleeping on you comfortably, but you are now awake filled with annoyance.

A quiet “Motherfucker…” tumbles out of your sleepy lips.

Why is everyone in the skeleton family such a tease…

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