Black Butler Cheater!Sebastian x FemReader: Innocent girl you say?

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Sorry this is for girls, but you males can switch it around if you want to! Your imagination i wont stop you

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You were in the Phantomhive building. You were going out with your Demon, Sebastian, but something always concerned you. Whenever he was around you he never showed affection. He always smelled like some type of perfume whenever he went over to you. You didn't like it... not at all. You decided to go what was he doing once and for all.

It was night and you heard Sebastian was off in the night heading out to do his buisness. This was your chance. It felt so wrong but it felt like the right time to do this. You ran out of the mansion scurrying off. You ran around the town finally hearing the voice you been wanting to here. You look over to the corner running towards that direction, taking a turn finally seeing your nightmare.

The man of your life and your friend...your only friend, Cassie ,making out. You started tearing up holding your hands onto your face, falling on your knees. " Having fun Sebby?..." you whispered out , having both of them turn to your direction, looking down at you. " __-______!" Cassie yelled out in surprise. You still sat on your knees looking down at cement ground. 

There was a huge pause of silence, Cassie walks over to you kneeling down in front of you. " __________ look i never meant to do-..." but you reacted before she could finish her sentence. You stabbed your kitchen knife into her chest as her life started to become black, blood oozing out of her chest. You yanked it back out having a huge grin on your face. " _-______?" Sebastian was worried for you.

Your friend layed on the ground being the cold friend she was. You stood up , slightly looking over at him. " Whats the matter Sebby?... Scared?" You snickered picking the knife back up. " Or you just shocked on what i really am?" you stepped up closer to him every step you took. " My lady what do you think your doing?!" He yelled out worried. " Just shut up already... you my sir should be dead for what you caused!" you yelled out using your speed. 

You were to quick, Sebastian  couldnt see what was happening. You jumped around taking a few swings, as he blocked it. What he didnt know was that you were a demon as well. You grinned laughing evilly. " Goodbye Sebby..." before he could block the attack, it was over. The knife was in his chest as everything felt like it was going slow. The one you loved was out of your life now. You slowly took it out of him as he layed in the ground.

" I cant leave evidence here..." you said to yourself with a smirk. You picked him up walking over to a lake. You threw him in the lake as he sunk down. " Bye Sebby..." you said your last words running back to the Phantomhive.

~ The Future ~

" Where can he be?!" Ciel yelled out in anger. You stood in front of his desk, having a blank face expression. " My lord... I actually do know where he is and what happened.." you said. he looked up at you with a shock expression. " Well tell me than!" He ordered out. " Ah ah ah. I must get something in return though." You smirked. " FIne fine fine, just tell me." You take a small sigh explaining everything.

" You did what!?" he yelled out after you were done explaining. " Yes i did... but now i must get my thing in return now." You grinned walking up to him. " You know the secret so i must get rid of you now..." you laughed out loud. " say goodbye Ciel!!!" You screamed out laughing evilly. All was heard left was Ciel curtling scream of his death.

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