Together in Insanity (Yandere!Sangwoo x Reader)

I have to know who he is or what he is. There's just something so familiar about him I can't stand it.

~*~

Y/n is a serial killer. She hides them behind a hidden door in her attic. Everything was fine in her not-so-perfect world until he showed up. Sangwoo Oh. Something about him made her want to learn more but her plans drastically change when they learn of each other's deepest secret and decide to kill together. What Y/n still doesn't know, is she is no longer free. She is his and he will never let her go.

(And yes, there is smut
-Dirty)