The Day after Marie met a turtle with a blue mask TMNT x Sonic Fanfiction

The Mutation of Karai and Leo

Karai's POV

I wake up. I remember the night Leo confessed to me. He also asked me to be his girlfriend. I told him yes. We became a couple. I live with the turtles. I'm happy being together with Leo. In a few weeks, we will meet some of Charles and Marie's teachers. They have become close friends with them. Marie told me that her English teacher, Mr. Shadow has been training Charles and herself. They have been learning how to use Chaos Powers and their individual Element Powers. I put on my breastplate armor. I also put on my arm and leg armor. I put on my makeup. I walked towards the kitchen to see Leo on the bar so eating bacon and eggs. I come up behind him. I cover his eyes. I say. "Guess who." He replies. "Karai." I answer. "Correct." I sit beside him and say grace. I eat my food We spar together in the dojo. Afterward, I decide to talk to my father about my mother. I tell Leo what I'm going to do. He warns me that I won't like the information about what happened to my mother.

Leo's POV

 After she goes to talk to Splinter, I play some video games with my brothers. I see her storm out of the dojo. She leaves the lair. I say. "I'm going to follow her. Tell Master Splinter to come after us with you guys in the Shellraiser." I follow her to Shredder's Lair. I watch as she fights Shredder with all of the skills she has learned as a kunoichi. I realize Shredder knows all of her surprises because he taught her all she knows. This isn't going to end well. I'm about to jump down to her and help her fight him when he knocks her out. I have to wait for the right moment or I'll be captured as well. Shredder tells Tiger Claw they are going to take her to Baxter Stockman's Lab. I follow them to his lab. Shredder puts her in a metal cage and places her hands in the metal cuffs. He closes the cage and pulls her up above the mutagen tank. I look on in shock. He wouldn't mutate Karai, right? He does consider her as his own daughter. Shredder tells Tiger Claw that she is only bait for the turtles. He wants to use us against him because we will be mutated into snakes.

 I hear Master Splinter and my brothers arrive in the lab. Tiger Claw smells Splinter. We try to rescue Karai, but my brothers fall into metal cages. My katana gets in the way on the cage closing. I open it back up and run over to the chain. I slice it and it brings me up to Karai. I take the duct tape off her mouth. She smiles and tells me thank you. I smile back at her. I have to figure out how to release her. I hear Splinter scream. "Leonardo! Look Out!!!" I look behind me to see the Shredder about to decapitate me. I move my head to the side, but not in time. I feel his  arm blade slice a large gash into my face. I scream. Karai looks on in horror. 

He accidentally slices the chain holding the metal cage Karai is in. We both fall in. We both scream. I feel the mutagen surging through my veins. Karai and I bang on the glass. We both scream in agony from the mutation. We climb out. Karai falls first only to have Splinter catch her. I fall next and I land on my serpent tail next to them. I vaguely remember Splinter is my father and sensei. I realize I'm a snake. I look similar to Karai, but I have my shell where her armor is. I know that I won't be able to control my snake instincts from hurting my father. I have to get away from him for his own safety. Karai squeezes sensei, but he tells her that he is her father. She realizes who he is and releases him. She starts slithering away. I follow her. She is my girlfriend after all. She spits venom in Raph's eyes. I hold in my laughter. He kinda deserved that not gonna lie. We slither across a few buildings. We both slowly turn into our original selves, but we have snake eyes and snake teeth with a forked tongue. We both make snake sounds. We slither off into the night. 

Donnie's POV

Two weeks later, I have completed making two mutant serums to Leo and Karai come back to their original selves. They won't act on snake instinct anymore. We find them sleeping in each others arms on a rooftop. Mikey says. "They look so cute together." Raph says. "Mikey focus. We can't wake them up or we won't be able to help them." I go up to Leo and inject the mutant serum into his arm. He squirms in his sleep. I move on to Karai. I inject the mutant serum into her arm. Leo transforms back to his turtle form with snake eyes and snake teeth with a forked tongue. Karai transforms back to her human self with her snake eyes and snake teeth with a forked tongue. They wake up. Karai backs away from me. Leo comforts her. They realize that they are back to their original selves. They say in snakelike voices. "How are we back to our original selves when we didn't do it ourselves?" I say. "I can answer that question. I injected mutant serum in you two to bring you back to your senses. Your snake instincts won't overcome your original senses." Leo says in his regular voice. "Of course Donnie would be able to figure out a way to bring us back. Wait a second. My voice is back to normal. Yes! I didn't like the snake voice." Karai smiles. She says. "Thank you Donnie for bringing us back." I answer. "It's no problem, Karai." We take them back to the lair. Master is happy to see them. He hugs them both tightly. He silently cries. We take Karai to her bedroom. Karai asks if Leo can stay with her. Leo blushes and tells her yes. We bring a cot for him to sleep in. He lays down on the cot. Master Splinter bless them with Holy Water. They both fall asleep soon after. We go to bed and fall asleep dreaming about our girlfriends.