Main house? This was a freaking mansion. It had 7 stories; 3 above ground, 4 under. You werent able to explore it though because Sans rushed you to Asgore's office. As you were dragged to the elevator, you passed many a monster. There didnt seem to be a single human until. . . 

"SAAAAAANNNNNSSSS!" Something made the skeleton topple over. "Ooof! Geez kid, tryin to get me killed?" The being that knocked him over was none other than Frisk. Their hat got moved out of place by the impact and were covering their eyes. "Sorry Sansy! Did you kill him?"

The skeleton moved their hat backed into place. Frisk's eyes gleaned with excitement. "What have I said kid?" Frisk looked down disappointed. "No killing per willing..."
They got off of sans and helped him up. "So what did papa have you do?" Sans smiled looking at Papyrus and you. "Had to save his jewel." Frisk looked over him and their jade eyes met your (e/c) ones. "(Y/N)!?!?"

You waved at your cousin. You were the next to be toppled. They bounced up and down on top of you. "OMG OMG OMG OMG OMG OMG!!! (Y/N) YOU'RE HERE! YOU'RE REALLY HERE!!!" You coughed every time they landed on your stomach. "Frisk-! Can't-! Breathe-!" They stopped heavy on you. After a coughing fit, you smiled at them.

"How have you been Frisk?" They smiled helping you up. "Its been nice! Although I solemnly go on mission, it's really fun here! I help the injured crew when they come back and give good promo to the news!"

"Sounds fun..." You said eyes wandering to Sans. "Makes me question why Uncle wanted me..." Sans chuckled. "Dont ask me. I just do my job."

"Well, good luck, (y/n)!" With that they skipped away. Your shook your head as the elevator took you down to the last floor. You looked at the corner of your eye to see Sans just staring at you. Did you have something on your face?

"I still don't understand why Boss wants you. What does he have to gain from a human girl?" You shrugged watching the numbers from each floor. A roboic voice greeted you three.

"Hello: Sans. Papyrus. And (y/ n). Asgore is in his office with: Alphys and Toriel. He is waiting for you."

The doors opened with a ping. They opened to a small hallway with a large door at the end. Tapestries hung on the wall. Embroidered on them was the history of monsters. Sans led the way stopping at the door.

"Hey Boss. We got your jewel." The doors automatically opened and you squeaked. Sans chuckled walking into the room. Papyrus gave you a small nudge and you inched after Sans. There sitting behind this huge desk, was Asgore. He seemed to be having a deep conversation with Alphys. Toriel was sitting on his desk legs crossed. 

"Well, Alphys, if you cant get the machine generator working how are we gonna combine the sou- OH GOOD YOURE BACK!" Asgore's voice boomed through the room. Sans bowed infront of his desk. "I hope there was no confrontation, Sans," Asgore said as he put his hands together. "With the Keg Team? Sir, there's always one." Asgore laughed as he sat back in his chair. "And my jewel wasn't compromised?"

"Uncle, Im right here. No need for code names," you said passing Sans who was still bowing. "Oh, my, (Y/n)! Look how much you've grown!" Toriel said getting off the table to hug you. "Hi, Toriel-!" You said in her death grip. "I see where Frisk gets the excitement from." Toriel giggled letting you go, her hands still on your shoulders. "My, my, my. You've grown into a very beautiful woman. Got a lover yet?" 

You scoffed. "Toriel! That is a question for private conversation." Toriel laughed. "Oh, I'm sorry dear. We'll talk about it later." She went back and laid her arms on Asgore's shoulders. "I'm sure your questioning why you're here."

"We are all sir," Sans said putting his hands into his pockets. Alphys started talking. "W-we've been n-needing a subject to be infused with all the old souls we have on h-hand. Monsters c-c-can't and we need Frisk to be the pure de-determination. "

Sans face showed a glimpse of anger. "So you want your 'jewel' to be this subject. Im sorry, Boss, but thats just plain wrong. She's your niece!"  Asgore gave a curt nod. "I know, but with it being with a portion of Frisk's soul, we needed someone who was related. Their parents died, and if i am aware the only family left to Frisk is (Y/n)." Sans was about to speak. "It would be best to hold your tongue till i finish Sans," Asgore said with a hidden warning in his eyes.  Sans gritted his teeth. 

"Good. Now, (Y/n), we wouldn't do this without your permission." Asgore sat there with a sad smile, anticipating your response. "What are the pros to this?" you asked Alphys. "W-well, it depends on t-t-the souls you choose a-and the type soul you have. Magic is the only requirement in picking. "

"And the cons?" Alphys stayed quite. "W-worst case scenario is complete memory loss."