Sans decided to visit Frisk's grave today. He brought a couple buttercups with him to lay on her tombstone. He didn't expect to see a little girl there. She looked about five years old, had brown hair and seemed to be crying. Sans slowly approached the girl and placed a hand on her shoulder. She flinched at the sudden contact and turned around to face him. Her eyes were red and puffy, her face still warm and wet. She wiped her tears and tried her best to talk to Sans without her voice cracking. "H-hey mister. Don't m-mind me. I'm just watching after this lonely person's ghost." He sat down next to the girl, wiping his eyes for any forming tears. "You knew my sweetheart?" The girl takes a moment to figure out who he was talking about before nodding. "Yeah. She was my big sis."
Sans' eye sockets widen. Frisk never told him she had a sister. The girl lets out a small, half-hearted laugh. "I guess I'm the big sister now." Sans was now even more depressed than before. "Where are your parents, kid?" He asks, trying to hold in his tears. "Mommy and Daddy? I don't have one. Me and big sis stay at an orphanage." Sans looks away. This kid's life is going down the drain. First, her parents abandon her and now, her sister's dead. After choking down a sob and letting a few tears run, he turns back to the girl, only to find her gone. "Kid? Where'd you go?" He stands up from where he's sitting and looks around the cemetery for her.
After a while, Sans finds her standing on a dead patch of grass in an abandoned corner of the cemetery. Upon closer inspection, she was wearing the same jacket he buried Frisk in. "How'd you get that?!" He asks, scared, angry and confused at the same time. The girl turns around to face him, tears streaming down her face. "She said thank you." His eye sockets start to well up with tears. The kid was talking about her sister. His sweetheart. Frisk. He falls to his knees and cries into his hands. The girl walks up to him, patting him on the shoulder and hugging him in an attempt to comfort him.
She starts to whisper into his "ear". "She asked you to keep me safe. She also taught me a small song." The girl knew Sans didn't want to hear the song right now, so she planned on singing it to him later. They both walked back to Sans' house after sharing a big hug, complete with tears.
"So, what's that song you told me about?" The girl perks up. "Oh yeah! The song!" She pulls Sans to the couch. She then positions herself in front of Sans as if getting ready for a performance.
Every night, I dream you're still here
The ghost by my side, so perfectly clear
When I awake, you'll disappear
Back to the shadows with all I hold dear
With all I hold dear
I dream you're still here
Sans applauds politely, wiping a few tears away. The girl curtsied. "Where'd your big sis learn that?" The small child taps her chin in thought. "She said it was from someone named Toriel." Toriel sang her to sleep? That's unusual. Sans cracks a small smile. "I guess you're gonna hafta sing me to sleep every night." The girl giggles and playfully slaps Sans' arm. "Silly goose! I can't do that all the time!" Sans chuckles at the new nickname. "Oh well then. I guess it's only fair to sing you to sleep all the time, too". The child throws her hands into the air shouting out "YAY!" Sans smiles. He may have lost somebody, but he found someone else worth taking care of. He could get used to his new little sister.
A/N: The song used in this short story is Still Here by Digital Daggers.