The female chuckled.

"Well, working of course! At first, I thought I was a goner, when I fell down here. I mean, my camping equipment even didn't fall down here with me. Plus it didn't look like there were any wildlife or edible plants, so can you imagine how I must have looked like, when I discovered that there was a city down here?" The female rambled in a fast pace. Gaster could do nothing more than just stand there in confusion.

"Oh, how rude of me! I should introduce myself. I'm Kateryn! But everybody calls me Kate! Can I come in?" She asked and pointed at the room behind him. Finally stopping rambling for a second. Gaster was still confused, but stepped aside for the human to enter his lab and home.
She quickly grabbed her stuff and stepped inside as if she owned the place. Upon further inspection, the human also had a guitar strapped to her back. She quickly began talking again.

"And where do you go, when you discover a city, that not only is far underground, but also is inhabited by strange creatures, who calls themselves 'monsters'?" She said as she placed her stuff on the ground and turned around to face him for an answer. He didn't get time to answer of course, before she answered for him.

"The library of course! Even though it was spelled wrong, it was pretty cool!" As she took a moment to breathe, Gaster decided it was time for him to speak up. Or else he may never get the chance again.

"What are you doing here, human?" He butted in.

The human was quiet for a moment. Just starring at him, which made him slightly uncomfortable. Suddenly, the human pulled out a bunch of papers from one of the bags and offered them to him.

"My recommendations." She explained dryly at his confused face.

"Recommendations? For what?" He asked as he took the papers and skimmed the text. He made out a few quotes. 'Always brightens up the place', 'extremely useful and clever girl', 'obedient who takes her work to the next level'.

"I'm applying as your assistant, of course!" The wide smile reappeared on her face as she put her hands behind her back and proudly puffed up her chest.

Gasters jaw dropped.

"Assistant? But I don't need an assis.." He began protesting as she cut him off.

"Oh. Neither did any of the other doctor or professors I've worked with in the past. But none of them regretted it, when they gave in and they found out how useful I was! And.. not to brag but, I'm a genius. Science is my passion! When I read about your research in the library I thought 'if this is what he released to the public, who can wonder what kind of research he is currently working on, right now?'. So of course I knew that YOU had to be my next boss!" She claimed and folded her hands while looking admirable at him.

This made a little more sense, of all the things the woman had said, in what short time they had talked. Gaster thought about what possibilities he had and what kind of use the human could be. His first thought was of course to just kill her and steal her soul for research. Yet.. she was looking at him with such innocence. Surely, he could take advantage of that. Maybe he didn't have to kill her this instant. He just had to play along for a few minutes, until he could lock her up and then he would have a living human for testing. It was quite humorous actually. A human just willingly walked into his lab and practically begged for him, to capture and use her. He looked down at the papers again and acted as if he actually considered her request.

"Oh! And of course, discretion is my guarantee. Nothing you say or do will ever leave this place. Besides helping in the lab, I can also cook, clean and do most chores. All I ask is to be included in your work, roof over my head and meals of course. And the most important.." She paused, which made the doctor look up from the papers.

"To keep me hidden from the king and the rest of the monsters. I'm no idiot. I've both heard and read about the monsters history and how they are hunting for human souls. I know that you could just capture me right now and deliver me to the king. But my chances out there is just as good as they are here. I can be quite useful to your work, if you would let me. Again, it can just be a blind shot. So I'm making a deal with you right now. Cards on the table. If you keep me hidden I promise to make it worth your trouble."

The female had suddenly gotten serious. The sudden change in atmosphere was sending him chills down his spine. She knew. As she had told him, she wasn't stupid. But still, she put her trust in him. Mostly because there wasn't really other places where she could stay hidden. She didn't even hide that she knew what really was going on.

She literally put her life in his hands.

He pondered for a moment. He had already decided that she wasn't going anywhere. But whatever he was going to contact the king or if he was going to use her for some testing first. Anyway. He had to conceal her. If she found out about his true intentions, she would most likely run or fight back. If he just played along, she would just walk right into his trap like an obedient puppy.

"Alright.. You can stay. For now. BUT. If I find out that you're no use to me, I will hand you over to the king." He said and became a little surprised at the hopeful smile and sparkling eyes that met him.

"T..Thank you! You don't know how much this means! I promise, you will not regret this!" She beamed and picked up her stuff.

"So.. where am I gonna sleep?"

Sans and Papyrus was talking about a new game they had invented, when they heard steps down the hall. Nothing unusual. Except that, there were more than one set of footsteps. Longing for any kind of amusement, they had their eyes fixed on the two figures, making their way down the hallway.
They had never seen anyone else besides each other and the doctor. So they were quite confused, when a creature that wasn't a skeleton, strolled into the cell with the doctor at its side. Unsure about what to do, they waited.
The doctor put down the barrier and the creature walked in confidently. It shortly looked around and then approached them.

"Hi! I'm Kate! Nice to meet you." It said and extended her hand.

Confused about the strange gesture they simply just starred at the hand. Did it want something? An idea popped up in Sans' mind and he quickly gave the creature the only thing he had. He's rubiks cube!

Both the doctor and the creature lifted their eyebrows, but the creature quickly became interested in the small toy and inspected all of its sides while smiling. Suddenly, without warning it began turning the small toy with high speed. In a matter of seconds, all of the little cubes were arranged in the correct places and the creature gave it back with a smile.

"Oh! That brings memories of my childhood!" It said and turned its attention back to the doctor.

"You're gonna stay here for the time being. I don't really have space any other place." The doctor explained to Kate.

"That's okay! I don't really need much space anyway!" She answered and waved him off.

"I'll go grab a bed then." And with that, the doctor left.

*Perfect. She walked right into the trap. Did she seriously think that I'm gonna let her work here? Hmm.. I wonder what kind of experiment I should use her for first.*