Sans was worried.

Papyrus was avoiding him, and Sans suspected he knew why. What he didn't understand was why his brother hadn't come after him yet. He was sure the moment that his brother discovered that he and Frisk were together, he would beat the living daylights out of him. Or at least yelled at him. But this… this was almost worse.

He hadn't said a word in almost a week. Sans knew the moment he had found out. He could see it in the way he looked at both him and Frisk. Like he wanted to rip both of them to shreds. Yet he held back. He hadn't touched either of them. In fact, most days he was nowhere to be found.

Everyone knew now. They had been quiet about their relationship do to fears Sans had about his brother and Frisk was understanding. But now everyone knew. Alphys and Undyne didn't care. Their business was their business in their minds. Toriel disapproved of him and made sure to remind Sans at every possible moment. Flowey seemed to have become even more protective of Frisk and refused to give them even a single moment alone. Asgore was supportive. He even encouraged them.

"You two being together shows that humans and monsters can live peacefully. It is my belief that you two can bring hope to all monsters."

Talk about pressure.

"Everything alright, Sans?"

Sans looked down at Frisk. She had her head rested against his shoulder. They were sitting on the couch watching some human movie that had fallen down. Frisk had been so excited when she found it, she had insisted they watch it right away. It was some movie about a human family that could use magic. Well, Frisk insisted it wasn't magic. It was funny though, Sans had to admit. Flowey was glaring at them from the far end of the of the couch.

"I'm fine, sweetheart," Sans said softly. In reality, he kept expecting Papyrus to walk through the door any second. In reality, he knew that Papyrus would probably be spending the night wherever it was he kept running off to recently, but it didn't keep him front eyeing the door warily.

Frisk looked like she was about to say something else, but stopped. Her eyes widened and she sat up straight. She stared into the distance with a look of confusion on her face.

"Frisk? What's wrong?" She didn't respond. "Sweetheart?"

"It's in the ruins," Flowey said softly. "Golly, I've never felt so much determination in one person before…"

"Flowey, what is going on?" Sans demanded.

"It's a human. A human has fallen."

Xxx

Sans ended up using one of his shortcuts into the Ruins. Sans felt a sickening sense of dread that only seemed to get worse as Frisk led them through the Ruins to the place where they had fallen. All the monsters there greeted her as they walked pass, then shrank away when they saw Sans.

Eventually, they reached the end of the Ruins where the golden flowers grew. The light from above shown down on the bed of flowers like a spotlight. It was beautiful. It was fitting that his angel had entered the Underground through such a place. Someone was there, on the flowers. They lay motionlessly on the flowers. Frisk ran forward, ignoring Sans' startled protest.

"You don't know this human!" Sans called as he followed after her. "They could be dangerous!"

Frisk didn't respond. She rolled the human onto their back. It was a young man, he realized, and seemed to be around Frisk's age. He was handsome too, Sans had to admit begrudgingly. He could almost pass as one of those bishounen in Alphys' anime she watched for 'research.' He had ruffled blonde hair, pale skin, and long eyelashes. God, even the guy's lips were perfect. He was no scrawny boy, either. He was slim, but Sans could easily see the wiry muscles where his clothes exposed them.

Sans, on the other hand, didn't even have lips.

God, were all the humans as beautiful as Frisk and this guy? He never had the chance to meet any of the other humans and now he wondered if they were as attractive as the two before him. Sans stood just outside the edge of the light, not daring to step in. He felt very much like he didn't belong anywhere near these two.

The fallen human growned. He blinked a couple of times and squinted against the light. He looked dazed as his eyes wondered before falling on Frisk.

"Well," he said with a shaky voice. "If you are here to guide me to afterlife, I ain't gonna complain."

Sans rolled his eyes and to his displeasure, Frisk giggled. She shook her head.

"Than you aren't an angel? That's hard to believe," he said jokingly. He sat up and began to look around. "Where am I? I was on the mountain and I fell…"

His eyes widened when he spotted Sans. Sans gave him the creepiest smile he could manage, and even allowed his eye to flare up. The young man jumped to feet. He swayed a little, no doubt from standing so quickly, and grabbed Frisk's wrist. He pulled her behind him. Sans couldn't help but chuckle.

"S-stay away, monster!"

Sans couldn't help but laugh out loud now. This idiot thought he could protect Frisk front him? Even if he wanted to hurt her- which he never had and would die before he ever would- he wouldn't stand a chance! Frisk tugged on the human's shirt, trying to draw his attention. When she tried to pull away, he just held onto her even tighter. Okay, enough was enough.

"I ain't gonna hurt either of ya' so if you wouldn't mind, I'd like you to unhand my girl," Sans said. His tone was light, but there was no mistaking the edge to his voice.

"Your what?"

"My girl. My girlfriend. My significant other. The one with whom I have a romantic relationship. Let her go. Please. She doesn't like being manhandled," Sans said. It was taking every ounce of his willpower not to teleport right behind him and beat him senseless, but Frisk wouldn't like that. Once again, however, he was reminded of how unworthy he was of her. The human looked every bit the hero, while Sans the villain. Here he was, calling her his, when he did not even deserve to breath the same air as her.

"I'm sure if she had a problem, she would say so herself. She doesn't need some freak speaking for her," the human said.

For the first time since the entire altercation started, Flowey spoke up, well, more like laughed up.

"Very funny, weed," Sans growled.

"Sure is, trashbag!" Flowey replied.

The human let out a very unmanly squeak and jumped back. Flowey had decided not to accompany the two of them to the Ruins. He wasn't so fond of Sans' shortcuts. Sans' wouldn't doubt that he had been there the whole time, just watching.

"Howdy, I'm Flowey. Flowey the Flower," he introduced himself.

"I- wha- you-"

"Now, if you wouldn't mind letting my friend go, what that smiley trashbag said about her not liking to be manhandled is true," he said.

"Your wha- oh."

He finally let go of Frisk. She gave him a grateful smile and rubbed her hand painfully.

"Sorry," he mumbled.

Frisk shook her head.

"This is Frisk. She doesn't talk, by the way," Flowey said. "And the creep hiding in the shadows is Sans, and yes he is her boyfriend, though I don't have the slightest clue what she sees in him."

The human looked over to the skeleton doubtfully.

"Anyways, Welcome to the Underground," Flowey said with a hint of sarcasm. "I hope you enjoy your miserable life down here, because you are never getting out."

"What? What do you mean, 'never getting out'?"

"There's a magical barrier that keeps everyone trapped down here," Flowey said. "There's no way out. Luckily for you, things have changed around here. It used to be a death sentence for a human to fall down here. Now, well, you'll still want to watch your back, but you might be able to survive so long as you play nice."

"That's not very comforting."

Sans didn't even notice Frisk had moved until she felt a hand squeeze his arm. He looked over to see her smile. He gave her a genuine smile back and squeezed her hand in return. He felt a pair of cold eyes on him and looked back to the flower bed. The human was staring at them. There was an icy look in his eyes that made him want to take Frisk and run. Before anyone else could notice, the look was gone and he was smiling apologetically.

"Ah, sorry about before. You startled me quite a bit, as I'm sure you can imagine," he said.

"Sure," Sans replied

"So what's your name, human?" Flowey asked.

"Calvin, but everyone usually just calls me Cal."