That's Sas's Theme Song; It's Called "Pain". Enjoy The Chapter! :3
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➰ Sas's P.O.V ➰

I walked along the forest floor. No one had gotten hurt today, as far as I knew. I was proud of myself; Some people get in danger on purpose just to get to see me. I was flattered, really.

      Wait, I saw Papyrus standing near a little girl. She had a bloody knife and Papyrus looked confident, yet angry with her.

      "I, THE GREAT PAPYRUS, STILL BELIEVE IN YOU!!!" Papyrus said. The girl just laughed and rushed at him.

      "NOO!!!" I screamed and ran in front of Papyrus, and whacked her in the head with my Magical Staff. Papyrus was like another brother to me; I couldn't just let him die.

      "Y-YOUR.... THE CLOAKED ONE!!" Papyrus exclaimed, backing up.

      "Get out of here." I said in my "voice". Papyrus immediately ran off.

      "Why protect them when their going to die anyways? Your pathetic, "Cloaked One."." The girl hissed.

      "At least I'm not a killer and heartless. Or a coward." I snapped.

She raced at me and swiped her knife, but I dodged and knocked her into a wall of a house with my staff. It blasted green beams out of it and knocked the girl around. I finally raised my hand, and her SOUL turned green, and I moved my hand and she moved with it. I smacked her against a wall, to the ground, tossed her into the air, then back again.

      "This will teach you not to mess with my family." I growled and slammed her into the ground, resulting in a huge hole. I disappeared before she could speak, or even get up.

      I followed Papyrus back to his brother. They were at Grillby's.

      "SANS! YOU WILL NOT BELIEVE WHAT I JUST WENT THROUGH!" Papyrus happily exclaimed. Sans smiled.

      "What's up bro?" He asked.

      "THE CLOAKED ONE CAME AND SAVED ME!!!" He said, excitedly.

"Woah, cool bro." Sans said, drinking his ketchup bottle. I always found that adorable.

      Later that day, I heard Sans whisper something to himself. I couldn't make out all the words, but he said something like; Kill her.... Last corridor.... Dunked on.... Regret....

      I followed Sans to the Last Corridor and found him battling the little girl. He kept killing her, but she would just appear again.

      "You can't kill me, silly skeleton." She giggled. I balled my fists. I watched from the shadows.

      "That's what you think." Sans snapped and summoned Gaster Blasters.

      A few minutes went by, and I saw the little girl run up to Sans when he wasn't paying attention, and stab him in the arm.

      Sans screamed in pain, and the girl stabbed him in his leg so he fell. 'No....' I thought. I reacted immediately and whacked the girl against the side wall with my staff. I walked to up her, but she attempted to stab me, but I dodged and grabbed her, and threw her at one of the long pillars.

      "Who... Who the hell are you...?" Sans asked me.

      "It's about time I reveal myself." I whispered. I ripped my cloak off and revealed myself in my sweatshirt, shorts and slippers. I heard Sans gasp.

      "Look what we have here? It's the pathetic skeleton who got her family killed!" The girl squealed. I twirled my staff and ran toward her. I stabbed it threw her head, splattering blood everywhere.

      "W-What?! WHAT'S HAPPENING?!" The girl screamed. I didn't know what she was talking about, but I then saw her legs disappear.

      "Magical staff." I responded.

      "NO!!! N-NOTHING CAN KILL ME!!! I'M CHARA!!! I'M A GOD!!!" Chara screamed. I laughed as she disappeared fully. That's when I turned back to Sans. He was standing, well leaning, against a pillar, looking at the ground.

      "So, you've been The Cloaked One the whole time..." Sans said.

      "Why?" He asked, and faced me.

      "I wanted to help people. That Sas you saw when I fought you; that wasn't me. It was Gaster." I croaked.

      "That name doesn't ring a bell, but I know what you mean." Sans said and walked over to me. We faced each other, his face inches away from mine.

      "I missed you. I missed you so much." Sans sighed. I smiled as tears welled in my eyes.

      "I promise I won't harm anyone ever again." I promised. We hugged each other, and headed to his house for a start-over.