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

They say i'm crazy

-Mettaton's POV-
I got tissues and wiped off the extra cum off her. Wait... her friends and family... I showed a crooked grin to Alexis, "I'll be back darling, I have some work to do!~" I heard her whimper in response. I giggled. Haha...so pitiful. I went to the door. I pressed the button to go up to the surface.
-Alexis's POV-
I watched him leave. I cried out for him to stop. Even though it came more like a beg. I heard him giggle. He closed the door. I tried to struggle out, even with the pain from...that. I couldn't move the chains. I sighed heavily.
-Mettaton's POV-
I saw Muffet's restaurant up ahead. I snickered, trying to contain my insanity. I walked in and looked around. The color theme was black and purple. Webs hung from the ceiling and walls. Spiders crawled around, taking orders, and telling Muffet. She was in the back, currently making 4 spider donuts. She saw me and waved, "Hello dearie! Would you like some pastries?" I shook my head, "No thank you darling." Only two people were currently here, they both looked like they were about to leave. I headed towards Muffet. Muffet instantly backs up. I came closer and she backed into the kitchen room. I gazed around, seeing knifes and rollers everywhere. Perfect.
"What are doing?" Muffet's voice sounded small and innocent. I put a hand to my mouth and chuckled darkly. Muffet's five eyes were locked on me, fear edged their features. I grabbed a rag from the counter. It ties it around her mouth, her fangs sticking out ever-so-slightly. I made a tight knot. I snatched a knife from a wall. Muffet stared at me like I'm a psychopath. A twisted smile crawled in my face. I sliced her arms. She screamed. I put the knife on her joint where her elbow's connected. I pushed down. It wasn't breaking. I shoved it down. I heard a loud crack. Muffet shrieked. "Darling, it's your lucky day!"
I put the knife down. I grabbed her and lifted her up. She clawed at me. It took no effect on me. I grabbed her right, top arm. I twisted it the wrong way, then ripped it off. Muffet screeches. I repeated the action to all her arms. Soon the floor was covered in spider blood and her limbs. Muffet was crying the whole time. She probably doesn't even know what she did wrong. I grabbed her head and I harshly whispered in her ear, "Stay away from my senpai..." I twisted it around until it popped right off. The bones cracking was like music to my ears. I dropped her head and body. The kitchen was filled with blood. I looked around and found the oven. I put the limbs, body, and head in it. I turned the heat to the max. Luckily Alphys built me fire proof. I went out the back door. Soon enough the building lit up on fire. I watched it burn like a fireplace. I looked down at myself. I needed to get this blood off me. Alphys also made me waterproof. I jumped in the lake, which was right next to her burnt down shop. The water was inked with blood. I got out and grabbed a flaming washcloth and wiped myself dry. 1 down, 10 to go.