Frisk knew something was off when she had walked into the empty house.

Sans was nowhere to be found.

Something was wrong.

She checked everywhere when she had got no response from Sans. She checked the kitchen, where no food was being made, she checked his room, where he wasn't sleeping inside of. She then noticed the slight footsteps leading to the ruin doors.

And when she checked them, they were unlocked, and there was a pile of mostly melted snow near the bottom.

He had went out a while ago, and hadn't come back.

So, Frisk waited until it was late at night for his return realizing that he probably wasn't going to return. Maybe he would return inside of the morning.

But, on her way back to her new Home, she overheard some conversations.

"Ribit, Ribit! (Did you hear? The Prince has been returned home, I guess he won't be coming back here.)" Froggit said to a spider nearby.

"Yes, I heard he was knocked out screaming. The King will probably have to keep him inside of the castle by force!" A spider said softly back.

"Ribbit! Ribbit! (Poor Prince Sans, he just wanted to care about humans, and now he's a prisoner in his old house!)" The Froggit said.

"What?" Frisk whispered, staring at the two monsters.

"I guess we won't have any caretaker of the ruins anymore," The spider said, walking towards the spider web before waving goodbye, ending the conversation there.

"But big bro..." Frisk said.

However, she was filled with determination to retrieve her first ever friend in the underground.

And the young human child left the ruins.

~~~~~~

Toriel walked through the snow in a hurry, her head down in shame as tears cascaded down her fur.

She betrayed him.

She felt like the a scum of the earth.

Well, of the underground, but still.

That look on his face had sent waves or regret flooding over her soul. And she didn't blame him, after all she just basically threw him under the bus forever. Even if he did escape, where would he go? There wasn't many hiding options left in the underground, all of the Monsters had heard the news and learned what he had looked like, and she knew where his previous hiding spot was. He was practically trapped at that point, and if the King had found the human, they'd leave the underground, too.

She didn't think this all the way through.

She just made his world crash around him.

Everything he had built was being torn down by the person he had entrusted with his identity. She threw him back into his past that he wasn't ready to face yet with no escape.

Oh god, what has she done?

Suddenly, more footsteps dragged her out of her inner hatred discussion, looking up.

A human was leaving the ruins.

It was a young girl, with a striped shirt and shorts. She was glancing around, slowly closing the door behind her.

This was Frisk, the final human.

"Sans?" She called out, looking around, "Sans, are you-"

They both froze as they made eye contact.

It was an unusual sight for both of them. It was unusual for Toriel, seeing a human looking at her with it's eyes closed. And it was unusual for Frisk, looking at a crying goat female that was the same height as her.

"Excuse me," Frisk asked, "Can you help me find the castle, where Sans is?"

Toriel stared at the child for a bit before coming to a decision, nodding firmly to both herself and the small human child.

She would keep this promise, she would protect Frisk.