Frisk knew that women on Toriel's side often got pregnant when they were teenagers. Toriel herself had gotten pregnant with Asriel at 160- two years before she became a young adult.

"Promise me, my child, that you will not continue this trend."

Now, she was staring at the human pregnancy test. The two little lines mocked her, as well as the little heart on the monster test.

Frisk and Sans were usually so careful when it came to sex. He held his magic back, which prevented him from impregnating her.

But, five weeks ago, both drunk on happiness at Undyne and Alphys' wedding, they had sex. Did he forget to hold back his magic?

Frisk was seventeen, three months from her eighteenth birthday. They had been planning to announce their relationship after her graduation.

She bit her lip and picked up the phone.

Sans needed to hear about this.

-_-

"D- Do you want to keep it?"

Sans and Frisk sat on her bed. The skeleton was staring at Frisk's soul. A little splotch of purple had appeared- the formation of their child's soul.

Frisk nodded quietly. Sans let out a breath. "Okay. We can't tell anyone about this."

"Yeah."

Her parents would kill Sans, or at least make Frisk get an abortion. Neither of them wanted that- it was amazing, that they had created this tiny life, together.

"We can go to Mt. Ebott." She suggested. While most monsters had left the Underground, one fourth of monsters still lived underground. "Its only a bus ride away."

"Good idea. I'll come pick you up tonight." Sans said. He quickly kissed Frisk. "I love you two so much." He whispered, before disappearing.

You two.

He had been talking to her and the baby. Frisk tried hard not to cry at that.

She quickly scrambled off her bed, grabbing her backpack. Frisk needed to start packing.

-_-

"Do you know of any reasons of why your daughter would run away?" The officer asked.

Toriel shook her head no. Overcome by tears, she sobbed into a handkerchief. Asgore sighed. "Frisk is a good girl. She helped monsterkind in many ways, and was planning to study archeology in college. She had no bad grades or any trouble at school. For her and Sans to just disappear-"

"Sans?"

"Sans Snowdin." Toriel cleared. "He's a friend of the family, and very close to Frisk." Her gaze was haunted by the pregnancy tests they had found in the trash.

They were positive.

"Does Frisk have a boyfriend or anything like that?"

"No." Asgore said. "She wasn't very close to her schoolmates."

The police officer sighed. "Is it possible that Sans could be the baby's father?"

The two monsters froze. Finally, Toriel shattered the silence. "Yes." She whispered.

The police left with a list of places the couple could be.

Mt. Ebott was the last place.