You have a twin sister and you are her twin brother, your twin sister has a crazy ex boyfriend and you heard that he got sent to a mental asylum and your twin sister move out of the house to avoid from her ex

One day, he escaped the mental asylum and broke into your room, He clings onto you and he has a sadistic smile on his face

"My love...I miss you so much darling.." Scaramouche was insanely hallucinating and mistook you as your twin even though you're a boy