Twist My Screws-Mettaton X OC (Lemon + Yandere)

Mettaton NEO vs. The Undying Hero

-Mettaton's POV-
Finally. I get to use my powerful NEO form. I held my blaster and aimed at Undyne. I fired. A pink and white beam shot out and aimed for Undyne. She summoned a blue spear the counteracted the blast. She summoned more spears my way. I dodged them all. I jumped up and activated my flyers. I flew in the air. I shot my beam at her multiple times. Frustration started to kick in. Undyne was smiling as she dodged them. She summoned spears behind me. I flew over them and around them. I shot a blast at her. It hit her arm. It was incinerated. A stump of blood, flesh, and a bone was there. Undyne growled in pain. She was still smiling though. That's what irritates me. She's supposed to be cowering in fear! I hissed, "Die already you tadpole!"
-Undyne's POV-
I'm filled with determination. I ran right to avoid one of his blasters. My right arm hurts badly, but I will not give up from this son of a bitch. I jumped and backflipped over a blast of pink and white. It burnt the end of my hair. I summoned spears and aimed for the air. He flew over me and shot his blaster again. I ducked to the side. It barely missed my shoulder. Mettaton growled with frustration. I grinned. He stopped for a second. He aimed his legs at me and they detached from his body. They aimed at me. I dodged the sharp edge of the boot. It faced towards me and shot for my stomach. Not this time! I summoned a spear and aimed for the middle of the boot. It split the boot right in half. I turned to find the other boot launching in my direction. I aimed a spear at it. I held it down with my spear. I aimed more spears on it. My spears went right through it, destroying it. I heard the click and ducked, missing another shot of pink and white light. I heard Mettaton hissing with irritation. I looked up, I saw him aiming his canon at me. Face danger head on... I ran at him. Spear in hand. Blood tripped from my stump. I jumped up and saw him face to face. His face psychotic and surprised. I grinned , "NYAAAGH!" Time seemed to stop. I heard the click. But it was too late. Before I knew it a gaping hole was in my chest. My spear was so close to his chest plate. I fell to the ground. I hit the ground with a dull thud. My spear evaporated into nothing. I tried to get up and I fell on my knees. I coughed up blood. I felt my eyes glaze over with death. My body started to melt. It dripped with the unstable determination Alphys injected into me all those years ago. My vision started to fade. I-I'm sorry Undyne... Alphy's sweet voice echoed in my head. Memories swam in my head. I grinned, "G-Good...bye...Al...phys..." I fell to the floor. My vision faded completely.
"Good bye..."