[Author's notes: I type script form. Just a heads up. I know that's hated a lot,I'm just most comfortable with it. This is the story for my Undertale fan character Chia and Underfell Sans.
If Cannon x Oc/fan character is not your thing,I don't recommend this to you.
Chia x UFSans is a just for fun ship, you don't have to like it,its okay if you don't. Again, the ship is just for fun.

Plus, there will not be different au versions of Chia. She only exists in Underfell. That wouldn't make sense.

Now,on to the story!]

Chia was just on the surface, taking a walk. It was night, she had on purple fluffy pajama pants, a black batman t shirt, nightmare before Christmas slippers. She was just skimming through music on her phone, had ear buds in.

She was a adult, 24 years old. She had freckled cheeks, shoulders. She was only 5.2, had a rather big behind, chest for such a small thing, but she wasn't exactly the skinniest. She did have a gut, it was hard to tell, but it popped out if she had no shirt on. Even her fingers were smaller than most adult women. Her eyes were hazel, had a pinch of brown in there. Her hair was long, it went past her shoulders, her bangs were a tad too long, the wings part of her hair was longer than the back, that's how she liked it. She did have a tatoo that her sleeve was hiding on a shoulder, a navel piercing that was never seen. The jewelry was a dragon curled into a blue orb.

It was a warm fall night, the wind felt nice, stars were out, the moon shined, leaves fell off trees as the autumn wind blew.

Not paying attention, she fell into a huge hole that felt like came from out of nowhere.

Chia had no idea where she was. Flowey was trying to warn her, but Toriel was coming, scared for his life, he quickly went inside the ground. Toriel did indeed attack her, Chia, while running, got forced into battles with all of the monsters in the Ruins, she took a bit of damage, almost got hit by one of Toriel's fire balls. She tried hard to dodge every attack.

In Snowdin, Papyrus was lecturing Sans about crap, as always. Sans just nodded, looked uninterested. He was used to it.

Papyrus: I better not find you asleep again, Sans! And if I come home, I find that you once again, failed to pick up that nasty ass sock, I swear to God, Sans, I will force that foul thing down your throat! Am I clear!?

He growled, hands on his hips, sick of his brother's laziness.

Sans: Yes, boss.

Papyrus left to tend to a meeting with King Asgore as requested.

Sans laid back at his station in his chair, reaching in his coat pocket, pulling out a cigarette box. His head hurt from drinking the night before, was hung over. He took a cigarette out, lit it with a lighter, took a puff. He doubted any human would fall. He hadn't seen one since the last fallen soul, but that was two years ago. Everyday just felt the same. He honestly lost hope that any good would come to him, just did his own thing.
After a bit he closed his eyes, just half asleep.

Chia just escaped, slid her back against the Ruins door on the other side, now in Snowdin, slid into the snow, panting, sweating, needed to catch her breath. She looked up when she recovered a bit.

Chia: N-now where am I?..I almost got killed multiple times, including being roasted by a huge ass goat. Now, snow..what the hell is this place..?

She stood up, brushed the snow off her butt as she did. She inhaled, held her arms close for warmth, regretting not wearing a jacket. She soon found Sans at his station.

Chia: *looks close* Eessh..it doesn't look friendly. Not at all...better not wake it.. I'd rather not be almost killed again.. *thinks up how to get past him* ..I could...sneak past him?

She swallowed, what felt like swallowing her heart back into her chest. She got in the snow, got on all fours. She began to quietly, slowly crawl past the front of his post. However, crawling didn't exactly help. It still made shuffling, slight crunching noise. Sans woke up,trying to rest off his hangover, not really bothering to actually look.

Sans: Hello?

Chia froze, stayed quiet as possible. Her heart beat rapidly, hurting her, pale, sweating once again.

Sans: Anyone there?... *shrug, continues to smoke his cigarette* guess it was just nature or some shit..
He closed his eyes, still laying back

Chia's hands were freezing, red. She had her bare hands in the snow. She wanted to warm them up in her lap, but knew he was awake now, was praying he'd just go back to sleep. Suddenly a alarm on her phone went off, the chorus to Halsey's Gasoline blared loudly.

Sans jerked up, snarled, teleported right in front of her. Chia, in panic, slowly reached in her pajama pants pocket, turned the alarm off, put it back, thinking "I'm dead. I'm so dead. "