This is what I would like to call the Genocide ending. You will find out why.
Edit: Okay. Its not that much different from Pacifist. Big whoop de do. Sorry.. Honestly I think this is one of my lesser works. I do apologize. I have gotten better at writing so.. Yeah.

Frisk hugged me back, her fingernails digging into my back.
"I missed you so much...." I said nearly crying into her shoulder.
I heard a quiet laugh from her. For a second I was confused, but then I heard the terrifying words.
"I'll see you in hell sister."
Before I could try to push her away, she did for me and grabbed my arm so I couldn't get away. She dug her knife into my stomach all the way to the hilt.
"NO!!" I could hear Sans yell in terror.
I fell onto my back, having trouble breathing as blood poured out of me.
My eyes looked over to my sister who was laughing, "I told you. Frisk is never coming back."
Sans teleported himself in front of Chara and grabbed her collar and throwing her onto her back. Then he summoned a bone that pierced through her. I couldn't respond to it. My eyes were beginning to close and I was losing consciousness quickly. Sans turned to me, his eyes full of worry and terror.
He knelt down and carefully pulled the knife from my stomach. He heald his hand over my wound, and his mouth began to move, but I couldn't here him.
The last thing I could see was the tears on his face before everything went black.

Sans P.O.V.
Luckily, I found someone Chara didn't kill that could help (Y/n). Sadly, by the time I had.. she had lost so much blood.
I slept next to her.. well kinda.. I slept in the couch that was very close to being next to her.
She didn't wake up for awhile. She slept through the rest of the day, into the night and then into the evening.
The lady walked in and looked at me with a saddened face, "Sans.. I am really sorry to break this to ya, but you know she might not wake up.."
I held back from crying as I looked up at her nodding, "I know.. I know.."
She sighed and left the room shutting the door behind her. I stood up and walked over next to (Y/n). She was slowly becoming paler by the hour.
I began to let tears fall as I began to speak to her.
"I.... I know you may not be able to hear me, but... Please.. don't leave me. I don't have anyone else. You are the only one I have left, please don't leave me!" My voice was growing louder the more I spoke, "I won't be able to live without you here! My brother is gone. My friends are gone. All I have left is you. If I lose you... I won't be able to live with the fact that I let your sister kill you.."
She was still asleep. She was still breathing. The only thing keeping me sane was the fact that she was still breathing.
"(Y/n)... I love you.. don't leave me.. I'm begging you."
I knelt down onto my knees and I took her hand. I held it close to me.
I let my tears fall, as I held her hand to my chest. That's when I felt her hand move.
It moved up to my face and stroked my cheek bone. I couldn't help, but smile in pure joy, my eyes closing.
She was okay..
"Sans. . . ."
My eyes shot open as I looked over to her, her eyes fluttering slowly open.
I shot up onto my feet, "(Y/n)?"
She looked to me, a smile appearing on her face.
"Sans.."
I laughed slightly, tears of joy running down my face.
"You're okay..... you're okay..."
I leaned down and kissed her, pushing her head into the soft pillow.
I break away but only a small bit, "I love you."
"I love you too.."

End of the Genocide Ending