Five Nights in Undertale AKA Sans and Frisk get a job

The new job

A few notes:
1: This takes place after a pacifist ending, but with my own little twist (because I can never follow the norm). The twist you will read about soon.
2: I know some characters may be OOC. I'm still new to Undertale.
3. I know this seems like a stupid and crazy idea, but those are my favorite kind.
4. Frisk, in this fic anyways, is a girl. And around 16. Chara doesn't identify as any gender.
Now, get to reading.

"SANS! GET OVER HERE!" Said skeleton sighed. It had been 11 years since the monsters had come from the surface. 11 years since Frisk had defeated Asgore, then Flowey, and then Asriel (which Sans did secretly remember, just never let on). All using the power of friendship and her DETERMINATION.
'11 years since the resets... and the genocides...' Sans, being one of few who could remember the past timelines, could still remember all the resets and different timelines it had took to get their happy ending. But now, the monsters were living peacefully alongside humans... mostly. And everyone had settled in. Mettaton had become an idol on the surface, Toriel had become a teacher, Undyne had become a fitness instructor (and a strict one, Sans noted), Alphys a scientist, Papyrus a chef, and Sans... Well... He hadn't really thought about what he would do. He mostly did odd jobs and lazed around the house.
"SANS!" Papyrus shouted again. Sans shrugged, and walked into the kitchen, where he saw a teenage Frisk talking to the last monster the gang had brought up: Flowey. Sans, even after 11 years, still hadn't completely trusted the flower. But at least he couldn't cause any trouble up here. The flower was currently sitting in a pot. Sans paid the flower little mind, and instead focused on Frisk. He felt proud having watched her grow up. Of course, she still had her blue pants and blue and purple striped shirt as her favorite attire. That hadn't changed. Sans smiled, and turned to address his brother.
"yo, pap, what's up?"
"YOU KNOW WHAT." Papyrus replied. "REMEMBER? FRISK APPLIED FOR A JOB. AND IT STARTS TONIGHT."
"riiiiight." Sans replied. He had, in actuality, completely forgotten about that.
"WELL, I THOUGHT IT OVER, AND CAME TO THE DECISION THAT YOU SHOULD JOIN HER. YOU KNOW, AND ACTUALLY BE USEFUL FOR ONCE INSTEAD OF LAZING AROUND MAKING PUNS." Sans looked at Frisk for backup, but the teen just shook her head. He then, quite surprisingly, looked to Flowey for help.
"Nope." The flower said in his two-pitched voice. "Not helping you out of this one." Sans sighed.
"fine. i'll take the stupid job."
"GREAT!" Papyrus smiled. "I WILL MAKE YOU SOME SPAGHETTI FOR WHEN YOU TWO RETURN TOMORROW." And with that, Frisk carried Flowey up to her room and Sans used a shortcut to get back to his lab Underground. He wrote some notes down, and short-cut back to Ebott city and wandered till sunset, when he walked home. Later that night, at 11:30 or so, the skeleton was following Frisk to her new job.
"so, kiddo, where exactly are ya workin'?" Sans asked in his usual nonchalant manner.
"First off," Frisk started, "I'm not a kid anymore. Second, it's at this pizzeria called Freddy Fazbear's. I'm working night shift." Another thing Sans noted about Frisk was that she was much more talkative. He smiled, grinning at how much Frisk had changed, yet stayed the same. The two eventually found the place they were looking for. They entered, and found their way to the night guard's office just as the clock struck midnight...