A Cold Blue Heart (Sans x Female Reader)

Everything is RUINed...

Your eyes snap open and are forced closed by a bright light shining in your eyes. Carefully, you pushed yourself up into a sitting position and looked around. Golden flowers.....that was the first thing you noticed and undertale is the first thing that you thought of as you looked around. Even if it was a dream you couldn't help but be happy.....it was a dream right..? Slowly and carefully you stood up and an idea popped into your head: 'wait Floweys never seen me.....that means I can mess with him!'. With that thought you walked to the room Flowey greets you in. You walked inside and sure enough, Flowey was there. The second he saw you he started his usual dialogue but you cut him off. "How about we cut the crap Flowey.....or should I say Asriel?" you say and try not to laugh at his completely shocked expression. But that doesn't last long before changing into a look of pure anger. "WhO aRe YoU?!" Flowey demanded as a smile spread across your face. "That's none of your business" you say and he growls angrily. The world grows dark and enters a battle, a (f/c) heart floats up in front of you and everything looks just like the game. "DIE!" Flowey exclaims and you pray Toriel would get there soon. Just as the 'Friendliness Pellets' where about to hit you Flowey was knocked away by a small flame. Toriel. She stood in front of you and introduced herself as usual and guided you through the next few rooms until you reached the dummy. Now it was time to make a choice, on one hand you did want to see something new, but on the other hand you didn't want to hurt them. 'Just kill them, it doesn't matter, it's only a dream' a small voice told you, the voice was unsettling, it scared you but....something made you want to listen. You walked up to the dummy and the world entered a battle. You glanced at the MERCY button and the voice immediately interrupted you. "What are you doing...? You want to see something new right?" the voice said, echoing in your head. You moved your hand over the FIGHT button and hesitated...was this really what you wanted? Reluctantly you pressed it and attacked:
*You won!
*You earned 0 exp and 0 gold!
The battle ended and Toriel looked shocked. "No, the dummies are not for fighting! Their for talking...we don't want to hurt anyone...do we?" Toriel asked worriedly. She left the room, 'what was that?! Why did I listen?!' you asked yourself and, unfortunately, the voice responded "because your just like me..." 'Who are you?!' you asked the voice in your head. The voice laughed "none of your business!" the voice said, repeating what you had said to Flowey when he asked you the exact same thing. You moved through the rest of the ruins easily because there was no constant battles with monsters.....because there were no monsters left to fight. Why did you listen? Who knows, every time you entered a battle your body seemed to move on its own. At first you struggled to regain control but the further into the ruins you went, the less you struggled and now every single monster in the ruins was dead....almost every monster. Now you stood in the room Toriel let you stay in, trying to figure out how to regain control in a fight. 'Hello?' you asked unsurely in your head. "What do you want?" The voice asked sounding annoyed. 'Why can't I control myself when I enter a battle?!" you asked, obviously desperate for answers. "Why are you upset? You were planning on this anyway so I just speeded things up." the voice said nonchalantly. 'Yeah I was but..I'm starting to think this isn't a dream...' you told the voice. "Aww so you finally realized, I was hoping to at least get you to kill mo- I mean Toriel first" the voice said sounding slightly disappointed. 'So this really isn't a dream..?' you asked but you weren't sure if you actually wanted an answer to that question. "Of course it's not, if it was you wouldn't be able to feel pain" the voice said as if it was the most obvious thing in the world. You shake your head "I don't want this anymore, I don't care if I don't get to see something new, I don't want to hurt them!" you said your voice rising slightly. The voice just laughed and suddenly all feeling in your body disappeared. You couldn't move..you couldn't speak.....all you could do was see. Your head was swimming with hundreds of different thoughts as panic took over. Suddenly your point of view shifted and you were standing in front of yourself, your body was right in front of you, looking at you with a creepy smile. That's when you realized what happened, you and the voice had switched places, whoever the voice was had taken your body over as their own. You yelled and screamed at them, demanding they give you back control but all they did was laugh.

"SiNcE wHeN wHeRe YoU tHe OnE iN cOnTrOl?!"