Grillby's:
"Here we are. Your one way ticket to he- I mean, Grillby's," Sans said, as he held the door open for Frisk to walk in.
Frisk froze when she saw former enemies sitting around a table as they gambled over dog treats, and a sleeping rabbit in one of the booths. Sans led Frisk ahead to the bar stools, as he assured that she'll be fine since the dog guards were too busy gambling to pick a fight again. They sat on the stools, as Sans laughed when Frisk removed a few tacs from her seat after being poked on her bum. Grillby walked over in his burgundy suit, and purple flames.
"What's good, Grillz? Two burgs for the stay," Sans said, as Grillby looked at him with a scowl.
"..." Sans and Grillby had an intense stare down, as Frisk and Flowey watched in puzzlement.
"… Fine ya freakin' gas lamp! I'll pay now!" Sans said, as he slammed down some gold coins as payment.
Grillby chuckled as he took the money and left to the backroom to get the food.
"-Sign- I thought I'd get out of this one because I have a guest, but noooo. He had to be stubborn!" Sans growled, and then he turned towards Frisk more calmly.
"Anyway, I got a question for ya kid," Sans said.
"Huh? What's up?" Frisk asked.
"Have you ever seen a talking flower?" Sans asked.
"Wha- hello! I'm right here," Flowey said.
"An echo flower, stupid," Sans clarified, annoyed with him.
"...oh," Flowey said, looking away from him.
"Uhh, I saw the one near your station, but the monster nearby kind of became possessive of it," Frisk said.
"Heh. Yeah, they're kind of crazy about that specific one. Here, let me explain it to ya, since you want to know..." Sans said, and started talking with Frisk about the echo flowers.
As they spoke, Curtain walked in and when she noticed them, she started sneaking over. Grillby came from the kitchen and set the plates of food before the two, as he returned to cleaning a glass cup and watching Curtain since she was slowly walking over.
"Finally, grubs here. Want some mustard on that kid?" Sans asked, taking a bottle of mustard that was near his food.
"Uhh, no thanks," Frisk said, as she picked up her burger and took a bite out of it.
"More for me then," Sans said, and he drank the whole mustard bottle.
"Ugh," Flowey whispered, as he slightly cringed from the mustard-drinking skeleton.
Frisk only raised an eyebrow, but she continued eating anyway, until two hands covered her eyes.
"Don't move, or its curtains to you and your burger, human," Curtain said, as Frisk dropped her burger on her plate in fright, and Sans was watching intently.
"U-Uh, um... wait, curtains... hey!" Frisk said in realization, and she pulled Curtain's hands away from her eyes to turn towards her.
"What it up, kiddo?" Curtain said with a fake sheepish grin, and Frisk smiled while shaking her head.
"You almost gave me a heart attack," Frisk said, as Curtain sat next to her, opposite side of Sans.
"You know I like messing with ya. But between you and me, I'm sure the monsters wouldn't mind for that to happen to you to be honest," Curtain said, whispering her last sentence as Frisk gulped, although Sans heard her and narrowed his eyes.
"Well you still don't need to scare her that much. She needs to be prepared if a real opponent tries to attack her," Flowey said, almost scolding Curtain.
"Wha- You don't think I can be a REAL opponent? You're insulting my intelligence, weed. Trust me, if I WAS, you both wouldn't have a head on your shoulders, capiche?" Curtain said, her claws dangerously close to Flowey's face, as his eyes widened in fright.
"Now now, Curtain. I'm sure Flowey didn't mean it like that. I bet you'd be the best," Frisk said, as she held Curtain's arm, and she lowered her hand.
"Best? What about my bro?" Sans asked.
"Oh, he's the greatest, no one can reach his level. But Curtain would be the best," Frisk clarified, and Sans smirked.
"Ha! That's right! Don't forget that, petals," Curtain said, as she flicked her fingers at his petals, as Flowey pulled his head back with a growl.
"Hey, watch it weed, or I'll get the petal-cide," Sans said, as Flowey stopped growling while Curtain and Frisk giggled.
They continued chatting for a while, when Frisk noticed that Curtain was eyeing her food a few times. She looked down and realized that she had a quarter of her burger left, while Sans' hadn't touched his, but it seemed like he wasn't planning on eating it though. As Curtain and Flowey were once again having a disagreement that wasn't necessarily big since they were being civil, Frisk nudged Sans as he looked at her. She asked,
"Are you going to eat your burger?"
"Nah, I'm good. The mustard hit the spot," Sans replied.
Frisk looked towards Curtain, and then back at Sans as he watched her. She shifted her eyes to the side and back, as Sans narrowed one eye at her. After two more eye shifts from Frisk, Sans finally picked up on what she was trying to say.
"Tsk. What? You want me to be nice? Why should I?" Sans asked her.
"Because she's hungry and I don't have much left. You did just say that you were good so why waste it?" Frisk replied.
Sans just looked away, as if ignoring her, and then Frisk narrowed eyes with a smirk and said, "And why waste the perfect opportunity for a date?"
Sans was surprised by her question as his eyes widened and he turned towards her, a few sweat drops on the sides of his forehead.
"Wha-What makes you think I want to date her, kiddo? What the hell?" Sans said, more sweat forming on his skull.
"I mustard seen your chemistry, Sans," Frisk said, with a wink.
Sans was actually caught off guard as he turned away from her and thought,
'Dam it! That was a good one!'.
Frisk turned towards Curtain and Flowey to see that they were talking about the Ruins at this point.
"Hey Curtain," Frisk whispered, and she turned towards her.
"What's up?" Curtain asked, and Frisk took her hand and placed something in it.
When Curtain looked at her hand, her eyes slightly widened to see five gold pieces, as Flowey was also surprised.
"I need your help to distract Sans while me and Flowey get into Waterfall. I don't know if he'll try to stop us or distract us like now, but just in case I'd like your help beforehand," Frisk whispered with a smile.
Curtain closed her palm with the gold, a smirk on her face, and said, "You're speaking my language, squirt. I gotcha."
Sans heard what sounded like scurrying, as he felt a chill up his spine when he heard a voice close to him say,
"Hello sweetheart~"
He turned to see Curtain sitting besides him with a playful smirk on her face, as Frisk stood on the other side with a little wave. Sans wanted to stares daggers at Frisk, but seeing Curtain's charming smile drew him towards her instead as he smirked at her and said,
"Well, what's this? Am I that irresistible babe?"
"Heehee, you got me," Curtain said almost sarcastically with a shrug.
"You know you're taking a risk by associating with me. I'm pretty dangerous, sweety. I wouldn't want anything to happen to that pretty face of yours," Sans said, as he stroked her cheek with his hand.
"Aww, you care. But I'm a big girl and can destroy anyone who gets in my way. You don't have to worry," Curtain said.
"Heh. I guess not," Sans said, as he looked towards his burger.
He slid the plate in front of her, as she stared at it for a moment and then looked at him.
"Ya can take it if you're hungry. I'm not," Sans said.
"Wait, really? You'd let me have it?" Curtain asked.
"Sure thing, sweety. I'll take it upon myself to pay for our date," Sans said, with a wink, and Curtain felt her cheeks heat up.
"You actually want to date me? How bold... reckless, but bold," Curtain said, a small smile on her face.
"Heh. I guess you've grown on me, babe. Do ya accept?" Sans asked.
"Hahaha! Of course I do, darling," Curtain said, and she started eating the burger.
As they talked, Frisk slowly and quietly picked up Flowey and exited the diner.
"You're sure you want to go?" Flowey asked.
"Yes, and don't worry Flowey, your friend Curtain will be fine," Frisk said with a smile, and Flowey scoffed.
After a while of talking, Sans decided to ask Curtain something.
"Hey babe, let me ask ya, are you aware of other worlds?" Sans asked.
"… as in, alternate ones?" Curtain asked to clarify.
"So you know, huh? Welp, that makes it easier not to explain it, but how do you know?" Sans asked.
"I met a me before. She was pretty dark, but she was cool," Curtain replied.
"Hm, a dark you… I've met a handful of me's, but some of them just like to bug me. Got the nickname Red to distinguish myself from them," Sans said.
"Ooh, interesting. I've met other me's too because they needed my help with something. I got the nickname Scarlet," Curtain said.
"Scarlet... I like it. Suits you," Red said.
"Thanks Red… Huh, your name matches you too," Scarlet said.
"... Wait... Where's the freaking kid?!" Red said, finally noticing that Frisk was gone.
"Heehee. She must have left when you were distracted, sweety. She might be in Waterfall by now," Scarlet said.
"Wh... you," Red said with narrowed eyes, and Scarlet showed him the money Frisk gave her.
"She paid in advance, but I actually wanted to spend time with you. It was pretty convenient that she wanted to leave us alone, darling," Scarlet said with a smirk.
Red chuckled and said, "You two are going to give me a skeleton of work, aren't you, sweetheart..."
Yes! Final chapter for Underfell. This one was fun to do. :)
Now I move on to Storyshift, then Inverted Fate, then Underswap... I'm pretty excited to work on these!
If you have any other AU's let me know! See you soon. :D