His holding room was cold.

The entire lab was always cold, he didn't like it. There were no decorations on the walls, no sense of home and comfort. This wasn't an environment intended to raise a child, it was intended to raise a weapon of war. Skeletons weren't affected by heat or chemicals, so his creator didn't see it as any problem to worry about. So it was always cold, no heating.

It was lonely, too. There was only one other person there, and it was his creator. W.D Gaster.

Sans hated him. He always was experimenting on him, hurting him through those experiments. He wanted Sans to become the most powerful monster, able to kill an army of humans. Gaster didn't like humans, he didn't intend for them to escape to the surface without a weapon ready. He didn't believe that peace was an option with humans, he planned on using Sans as a weapon to destroy them.

The experiments were awful. Painful, he had to be strapped down so he wouldn't wiggle out of the tubes and needles. But he never cried, he wasn't allowed to. It hurt so much, he absolutely hated it.

He wanted to see the outside of the lab so bad, so see what other monsters looked like, to talk to new people and learn about them. He knew there were more people, but he only ever saw the skeleton who claimed to be his Father.

It was one night, after the experiments, when he was working at his desk when Sans decided he had enough. The experiments were over with, he didn't want to do anymore. So, that night, he decided enough was enough.

And the silly scientist shouldn't have left his holding room key in an obvious place.

It was Sans' hate that fueled him towards the scientist, a summoned bone in hand, while he was distracted. It was his determination to see the outside that made him hold down the scientist that was trying to struggle and stab him over and over with the bone.

And it was his strength from the experiments that allowed for him to kill the man he despised underneath him.

So he stood up, covered in blood and dust, feeling the recent kill surge through his bones. There was no one else to stop him as he walked through the halls, intent on getting out.

However, there was a room that Gaster had never told Sans about.

And he was naturally curious.

It looked exactly like his holding room, but except for the small corner where a single pillow was for his head, there was his old baby carriage instead. And inside of that carriage was a small skeleton child, only around a months old.

"Typical of him," Sans tsked, summoning another bone, "Always not thinking I was enough. Of course he'd make another."

His plan was to kill the child, as it reminded him of Gaster. He lifted up his blood and dust covered arm, a plain look on his face as he readied himself to kill him.

It wasn't in his plan, however, for the child to open it's eye sockets and smile up at him.

And that's when he felt something he had never felt before.

He had learned later in life what it was called was love. At that very moment, he had learned what it felt like to feel love, not just the emptiness and anger that was bestowed upon him by the Royal Scientist. It felt so different he started shaking and crying on the spot, letting the bone drop next to his side as the child giggled up at him, waving his arms.

"I... I-I..." Sans stuttered, looking down at the child with true emotions flicking through his eye lights, "Hello, little guy."

Carefully, he picked up the child, the short skeleton giving him a little smile before he walked to the door to finally see what it was like outside of the lab. He thought since that day, that he'd take care of Papyrus forever, that he'd raise Papyrus into someone who knew just how much he loved him, and hopefully Papyrus would love him that much back.

Apparently, he was wrong.

《》《》《》

Just a little backstory for all of you. Oh, and someone found a song that fits this story, and I'm actually listening to it right now!

Big thankies for finding this! (Cursing and suggestive themes and stuff)

https://youtu.be/yK-0DS9HYmw