Yandere Sans x Reader

Chapter 2 Sans' Love

(This is where sans is. This is his thoughts. Got it?)
How do I feel this way?
Sans couldn't feel any feelings. He had been born that way. A freak. He had only one feeling. Worry. He had been worried nobody would accept him. So he learned from his younger brother. Sadness, happiness, and a whole lot more. But He didn't know how to show them, except happiness. So he just smiled all the time. Everyone excepted it. Nobody knew that he had no feelings... until now. He felt something, unexplainable. It scratched inside him. Could this be... love? The undying thirst to hold this girl in his arms, and kiss her? No. It couldn't be. He couldn't feel. But yet.... he did. It was love. His eye began to glow. It glowed purple. For love. If he loved something more than anything else, it would glow like that. And he didn't want this feeling to go away. He didn't want anyone to take her away from him. When He saw her flirting with Papyrus, He was experiencing something. Like another feeling. This desire to kill his own brother. Could it be hate? No, he could never hate his own brother. He hated the thought of her being with Papyrus. His eye started to glow red for anger. It seemed to burn a hole in him. A hole that could only be filled by killing Papyrus. He now knew what feelings were like. He only needed to feel pure happiness, not just plastering a smile on his face. He was ready to get her by any means possible.