It was obvious Gaster was up to something science related.

Jandle had known Gaster since she was born, and he was always the one who would go all out when working hard or when he was excited. It's what she loved him for. He would stay late in work, work hard on notes at home, kiss her goodnight three times because he couldn't remember if he already did or didn't already. He even fell asleep on his notes a few times, so she would help drag him to bed. It was obviously a side experiment, since he didn't mention what it actually was.

But boy was she surprised when she discovered what the experiment was.

It didn't come from Gaster. Oh no, he never mentioned what exactly it was until she stumbled across it, or him, one morning. She was tired from the night before, working extra late with one new trainee who was so nervous that it took an extra hour to help him, since he kept getting distracted from another trainee. So they had to stay late, which meant she went to bed later.

Waking up at a crisp 5 o'clock, due to the same trainee asking to come in early the next morning for extra training, she walked downstairs into the kitchen. She made herself a cup of coffee, before passing by a child on her way to the living room, a skeletal child of which she assumed was Papyrus.

"Hi sweetie," She said sleepily.

"Hi Doctor Mom."

Wait, Papyrus shouldn't be awake. It was Saturday. He didn't have school.

"Wait, what?"

She turned to find a skeleton child, which wasn't hers, staring back up her, as if it was completely normal. He didn't even look like a normal skeleton, his head was round, and he actually had pupils, his bones being more frail and thin too. He was wearing one of Gasters t-shirts she thought he had thrown away or last at the lab, nothing else on since it went to his knees from his short stature. He looked like Papyrus' age, but it was hard to tell from his height.

"... Is this a nightmare?" Jandle wheezed, leaning against the wall for support and she wobbled in her stance. "Was this coffee drugged?"

"What is coffee? And drugged? And nightmare?" The skeleton asked, "Are you okay? Do you need to rest?"

"Oh my," Jandle said, "He's talking. This is real. Did I get pregnant and give birth all in one night?"

"May I ask what that all means," The boy asked.

"No, you may not!" Jandle said quickly, running a hand over her face. "Uh, where did you come from?"

"Outside. Doctor Gaster drove me here for 'Phase 1', which I don't know what that means."

Gaster drove him...

"GASTER GET YOUR BUTT DOWN HERE RIGHT NOW!" She had never been so confused and lost as she was right then.

"Coming, coming!" Gaster groaned, his voice distant.

As soon as he reached the bottom of the stairs, he paused when he saw the situation, Jandle furiously pointing at the new child.

"Explain!" Jandle said.

"Oh, uh, right." Gaster said casually, as if this was normal. "I created a brother for Papyrus."

"You... did what?" Jandle huffed out.

"He created me!" The skeleton said, pointing at himself. "As a brother! To help this new family of mine named Papyrus!"

Now, Jandle usually wasn't one to flip her crap. She's dealt with Gaster her entire life, she thought that she had known him, but this...

Oh...

"You literally created life in a lab!" Jandle asked very, very loudly.

"But Papyrus has a brother now! And he has my DNA, so we can continue the family name!" Gaster said, "I thought you'd be happy!"

"I-happy?-ugh."

The poor child looked confused, so she wasn't really mad at him, it wasn't his fault. She was confused herself. Life? How did Gaster create a child in a lab? Was that what he's been doing for the past months while she scoured for excuses on why Fishy hadn't come back from his trip to see his Uncle? Why did Gaster think it was a good idea to create a child in a lab?

"We can't just... make life in a lab... wasn't this illegal, didn't Asgore make it illegal for you to create a new life form in a lab?"

"Well, he did." Gaster picked up the child. "Do you want me to get rid of him? He has low HP."

"What, no!" Jandle said, standing up and grabbing his half of his body, "Don't just kill a child! He's still living!"

"No, I didn't mean, kill, I just meant keep him in the lab, he can just be an assistant or something!"

While the two argued, the child ended up flipped upside down, Gaster holding onto his right leg and holding him up with ease due to his small weight. Their arguing had long woken up their own son, Papyrus, and caused him to come down the stairs to find them with the fourth skeleton. He squealed into his hands at seeing another child, a skeleton on top of it, before eagerly waving to him. This caught the experiments attention, and he copied what Papyrus did, but at a faster pace, frantically throwing his arm around and causing the shirt to fall down and cover his face.

"Papyrus!" Jandle said, "Why are you up so early?"

"Did you guys get me a brother?" Papyrus asked, practically bouncing in his spot.

Jandle was about to answer no, but Papyrus was practically glowing from the idea. He looked so happy, so excited to have a sibling, causing her to look at Gaster, him shooting her a supporting look before motioning back to Papyrus.

Yes, she was mad at him, but he was still her husband. She loved him on every level, she knew she could always trust him, even if he was a bit... insane at times. Now this was definitely going too far, she could say, but she had no other choice but to nod.

"Um..." Jandle said, turning to Gaster, "Can you at least put him down?"

Gaster flipped the creation to his right side up and set him down, him straightening out Gasters shirt.

"I don't know if we can make this work," Jandle said to Gaster, "We'll have to forge documents, and how can we explain suddenly having another child?"

"So he is my brother?" Papyrus squealed.

"Hello!" Sans said, waving to Papyrus, "I'm your brother!"

Papyrus screamed.

There was actually a scream from pure joy, Papyrus tackling his new brother onto the ground and hugging him. The other just took the tackle and awkwardly tried to recreate the hug, unaware of common social interactions.

"Papyrus, go show him your room, he'll be staying with you," Gaster said, "Your Mother and I have to talk about some stuff."

Papyrus ran off with Sans eagerly, Gaster going to his work bag at the table and pulling out a large pile of slightly wrinkled papers.

"What are those?" His wife questioned, approaching him tiredly.

"I already worked on it, while I was waiting for his body to create," Gaster said, showing her the papers, "That we had a first born child before Papyrus, the story is that his body was so weak after birth he had to stay in the hospital until now. We never mentioned him because we didn't want people to worry. And we didn't enroll him into school this year since he's still weak so he can't be around other kids that could hurt him."

"You... thought of everything," Jandle said, "So, we're really doing this? What's his name?"

"Well, his font, as skeletal tradition stats," Gaster said, "Sans. Comic Sans."

~~~~~~

"What's your name, brother?" Papyrus asked.

"No idea!" Sans said, "Mr. Doctor Dad might make me one. He made me."

"Wowie!" Papyrus said, "Maybe I can create you a name? How about the destroyer of worlds?"

"Would that make sense?" Sans asked, "I've never destroyed any worlds. You're Papyrus, and your name relates to your font. Maybe my name should be experiment?"

"Or your font too! It's a family thing!" Papyrus said, "Oh boy, this is so exciting!"

"I know, I'm very excited!" Sans said, "It's so great to finally meet you! The moment I started understanding things Dr. Dad had told me all about you."

"Dad told you about me?" Papyrus asked.

"Yes he did, I was so excited to meet my new family brother that I was jumping the whole way here," Sans said, "Dr. Dad told me I had to buckle in. Cars are so interesting."

"I have toy cars! Do you want to see them?"

"What's a toy?"

Papyrus gasped loudly, his eye sockets widening as he pointed at his new brother in surprise.

"You don't know what a toy is?"

"Nope."

"Well, dear new brother, you have a lot to learn." Papyrus pulled out a large box from under his bed. "Toys are what you use when adults don't want you to bother them! They're distractions!"

"Oh, I love distractions." Sans crouched down next to the box. "I think that's what Dr. Dad does with those papers."

"Those are adult distractions," Papyrus said, "We aren't old enough for them."

"So people just distract themselves until death?"

"Indeed!"

"That's interesting."