You snuggled into the couch, sighing contentedly. Undyne was passed out on the floor, snoring. Everyone else was sleeping in their rooms. (Monster kid and Papyrus sleep in the same room)
You knew you'd have a nightmare. You weren't ready for that. But after awhile....
You drifted off.

You sat up slowly in the darkness, utterly wary. Someone was singing.
You stood as the darkness morphed into a beautiful forest, birds singing, flowers blooming,
and Toriel singing.
You gasped and went to wave, but blackness appeared behind her. She stopped singing and stood.
Her yellow-green dress swayed about her ankles, and she smiled.

"Sans. Your here again." She had her hands behind her.

Sans stepped out of the darkness, his deathly black cloak billowing. "Yeah, I am. I told you I'd be here." He smirked. His mouth moved when he spoke.

Tori blushed slightly. "I have something for you. Here." She held out a glittering, glass Lily. Sans' eye sockets widened.
"I made something that could not wilt. Something you could hold."

He cupped his hands beneath it, and it floated above his palms. He let out a breath. "Tori, it's...." He laughed breathlessly. "It's the second most beautiful thing I've ever seen."

She frowned, puzzled. "What is the first?"

He smiled up at her. "You."

She blushed. "Thank you Sans. Keep the lily as a gift. But promise, if someone needs it badly, give it to them. For it is a lily of pureness."

Sans stared at it in aw. "Of course, Tori. Your the only thing that can take my breath away, and once again you've successfully done just that. But I've gotta say," He started.

She slapped a hand over his mouth. "No." But she was smiling. She turned, her dress twisting around her, and seemed to drift away.
Sans moved to follow her, but you stopped him.

"Sans!" You hissed.

He froze, his hands still cupped carefully around the Flower. He slowly turned to you and frowned. "Frisk. You shouldn't be here. You shouldn't even be alive yet. How...?"

You put a finger to your lips, not wanting Tori to hear. "I'm not Frisk. Sans, what happened? Why do you look like this?"

He seemed to think for a minute before sighing. "You must be (Y/n), if I'm not mistaken. But... this isn't your timeline."

You walked towards him. "Sans, where am I?"

He moved to touch you, but snatched his hand back. "Don't touch me, kid. I am death."

You pulled back. "Sorry. But Sans-"

"(Y/n), don't speak. Here. Careful, don't touch me. Just cup your hands."

You did as he said. And he lowered the lily into your palm, your hand cupped around the bloom. "But I don't need-"

"Hush. You will, kid. Now get out of here. Wake up." He smiled, painfully. "And forget about this, because next time we meet, I won't remember you."

You nodded. "Alright. Thank you. Go find Tori. And please.... take good care of her. You never know when you'll lose her."

He nodded. "Go." He waved his hand in front of you, and everything blurred as you blacked out.