Imposter..?

N: hey Y/N you ok? Y/NS sister: yeah…just thought about how nice it would be to kill someone’s right now! N: what…*backs out of the room and hides in a different room. Suddenly he gets a call from Y/N and he answers it.* Y/N: hey N! need anything while i’m at the store? N: Y/N? i thought you were here. so if that’s not you then…omg….Y/N: is it my sister? N: yeah i think….Y/N: N…i need you to listen to me very closely…if she calls your name don’t answer her. she’s trying to lure you.