AU: UnderSwap
Timeline: Neutral
Prologue
Frisk fell down into the Underground and was found by Monster Kid and Frisk was adopted by the Dreemurs like in most Undertale AUs. Like in the Original universe, Frisk and Monster Kid made a plan to free all monsters, but unfortunately it meant that Frisk had to die. So she (canon Underswap Frisk's gender is up to the players for they are a girl or a boy)decided to eat buttercups to kill herself by poisoning. MK (Monster Kid) absorbed Frisk's soul to cross the barrier and collect 6 more human souls..they failed and returned to the Underground and MK turned to dust and the remains of Frisk's soul went to her dead body.
Frisk's body was put in a stone coffin in the basement of the castle. King Asgore took the body when he left for the Ruins and gave Frisk a proper burial.
Now onto the story,
Chara, one day was eating a walking taco, tripped on a root near a very deep hole and fell in, and was saved being killed on impact with the stone ground by a bed of buttercups. Chara landed on Frisk's grave, but Chara didn't know that until this cat-dog thing which introduced themselves as Temmie (Temmieare grammatically challenge, but not this one.This Temmie is evil). After Chara's fight with Asgore (she accidentally killed/dusted him), Frisk showed up and introduced herself as the First Fallen and Chara panicked thinking that this ghost girl will try to take her soul like Temmie tried to.
After Chara calmed down, she asked if Frisk could lead her to the barrier.
"Uh, sure I can lead you to the barrier, but there's one problem." said the ghost girl, "If you don't kill any monsters, how will you get their soul? You need a human AND a monster soul to pass through the barrier."
"We're connected, kind of, can't I use your soul?" Chara tried to explain her logic to Frisk, "You're not a human anymore, right? You're a ghost so your soul be considered a monster soul."
"Why did I have to get stuck with this moron?" said Frisk, face palming. Then starts to explain how souls work, she does a little bit better of a job than Temmie did. "Im a ghost, but I'm still human SO my soul is still human. See?" She somehow pulls out a faint glowing red heart, "This is my soul. Yours looks the same as mine, but glows a bit brighter because you're not dead. Monster souls looks like completely white upside down hearts, they will shatter instantly after death, humans' don't."
While Frisk was explaining how the soul work and calling Chara a moron in the process multiple times, neither of them noticed the two shadowy figures following them. Until the shadows make their presence known by the shorter of the two yelled, "Human! I will capture you, then bring you the capital and finally become part of the become a Royal Guard!"
"Um, bro? There isn't A human." said the taller one, making the shorter of the two sad. Seeing this, he said quickly, "There are TWO humans." Immediately, the short shadow was happy and excited, "Before I capture you, we should introduce ourselves. I'm the Magnificent Sans and this is my lazybones brother, Papyrus. Who are you?"
Frisk was shaking her head like 'no, don't tell them.', but as usual Chara didn't listen to her ghost 'friend' and introduced herself and Frisk, "I'm Chara and this is my new ghost friend Frisk." For some unknown reason to Chara, and apparently Sans (aka Blue or Blueberry) Papyrus (aka Carrot or Swap) and Frisk were glaring at eachother. Apparently either Sans completely forgot all about capturing the two humans or this is the way he considers 'capturing': taking them to the skeleton brothers' house to make tacos for them (don't bother questioning Blue's logic or reasons about doing anything he does. It will probably not help clear things up).
When they get to the house in Snowdin, the 4 walk into the house and Sans runs to the kitchen, yelling something about tacos, for some odd reason. After a minute, Chara decides to follow him to see if he needs any help. Papyrus on the other hand, just flops onto the couch, turns on the TV, pulls out a bottle of honey, and starts drinking it (you think THAT'S weird? Undertale Sans drinks ketchup and Storyshift Chara drinks chocolate syrup), while Frisk grumbles and complains like has stick up her ass.
After about 2 or 2 and a half hours, Blue and Chara come out of the kitchen with half a dozen tacos.
"Seriously? It took you two THAT long to make 6 tacos?" Frisk said, surprised and a bit annoyed.
"Well, it have taken enough half as long to make a dozen if SOMEONE wasn't eating them almost as quickly as I was making them." said Blue almost as annoyed as Frisk, " I'm talking about YOU Chara." Sans pointed her in the belly, which was sticking out from underneath her green with 2 pink stripes on it. Chara was already kind of fat before Frisk and Chara met. Chara's shirt just barely covered her belly, her pants were the same shade of green as shirt were pretty tight already (the button was barely able to stay buttoned, almost like if you poked it just lightly it would shoot off in some random direction) because of her fairly large ass. She had almost no breasts to speak of (though Frisk didn't have much room to talk herself), Chara also had 2 large rosy cheeks on a chubby face.
"Don't do that!" Chara gifgled, apparently she was very ticklish.. that might be some, but Frisk couldn't think of how.
After dinner, Chara decided to help with the dishes as a apology for earlier, and Frisk and Papyrus were on the opposite sides of the couch watching the only show that was on ever in the Underground: anything and everything about Napstaton.Both of them had thing in common, they found Napstaton EXTREMELY annoying. Sans told the humans that they had to sleep in the 'human capture zone', Papyrus said aka the garage. It was next to the tunnel to get to the other side of Snowdin.
That night, Frisk woke up after having a nightmare then noticed that Chara wasn't sleeping next to her she anymore. A few minutes later, she noticed that the door to the garage was open just a crack, so unable to keep her curiosity under control Frisk went off to find, in her opinion, her moronic 'friend'. And she found Chara stuffing her now very fat face with anything that was in the skeleton brothers' fridge. Frisk sighed and grabbed Chara's short, brown hair and pulled the now very fat girl with her back to the 'human capture zone'.
"Come along, Fatty." Frisk said in a quiet hiss, "do you want Sans to get angry at your twice in one day?"
"But I'm hungry." whined Chara, "and that hurts." Frisk thought about pulling harder, but decided against it, "That's a good to not fight against me."
When the two girls were back where were supposed to be, Frisk let go of Chara's hair, Frisk turned around closed and locked the door and then sat up against it. Then she looked up at the very fat girl that was massaging her head with tears running down her fat face. Frisk noticed that the other girl now had 3 or 4 chins, breasts that were about the size of footballs (American footballs, not soccer balls), a ass maybe the size of the other kind footballs (soccer balls), a pumpkin-sized belly. Because of her ass, her pants button must have shot off a while ago, also her shirt had rode up because of the size her breasts and belly to reveal almost everything that was underneath it. Chara took of her pants that really have any purpose now, currently she only had on very tight panties, her shirt that barely covered her breasts, white socks and brown shoes. 5 uncomfortable hours later, Blue and Carrot teleported into their garage to their surprise a fully dressed Frisk and a obese half naked Chara.
"Well, now we know where at least three quarters of our food went." said Carrot, trying to find a up side to this situation, but failing.
After Blue's shock wore off, Blue didn't sound angry or even the bit annoyed, "You like my cooking so much, you made yourself eat enough to gain that much weight?"
"You're not mad?" said Papyrus and Frisk at the same time, then they looked at each other and went back to their usual attitudes toward one another: some emotion close to hatred, for no apparent reason.
"What's wrong with you two? Can't you get along?" said the half naked Chara, Sans just put his bony hands on Chara's fat shoulders from behind, making her yelp in surprise because she's never felt anything like bone on any of her besides her hand eating chicken drumsticks and lsteered her toward the house to find some clothes that could at least cover somewhat of Chara's jiggly, fat, pale body.
"I've been asking myself that same question for years." said Blue to Chara, "I never can get an straight answer from Papy about what's wrong. Most likely I never will..."
"Don't give up, I bet he jus...." Frisk couldn't hear rest of Sans and Chara's conversation because of the skelebros' house was too far away to hear what they were saying from their garage.
After 30 minutes, after Papyrus and Frisk finish their 70 something shouting match, they walk into the house and see a even fatter Chara with almost nothing on, her shirt did not cover ANYTHING, especially not her gigantic belly which was so large and fat it was pushing the table away from her and also her massive breasts couldn't be contained in any bra you could buy from a store. Her colossal ass was no longer contained within her panties which were in a pile on the floor next to the stool that every so often made a creaking sound because of the weight it had to hold up. The only clothes Chara still had on were her socks, she didn't have her shoes on, her feet must have grown too fat for them. Just one minute after Papyrus and Frisk came into the house, all of the sudden the wooden stool that held up the immense weight of Chara, couldn't anymore. It broke into splinters, the huge girl fell less than a foot and then...
What happened?
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