I saw on tumblr a post that said "enemies with benefits who kill everyone who dares to hurt the other because they're very possessive of their enemies status and will die by each other's hands only"

This post made me think what about a Klaroline story where they are enemies who secretly hook up every once in awhile.

They know they are from different sides, their inner circles won't collide but somehow they do.
When their friends wonder why they help each other when the other is almost dying they say it's because they want to be the one killing the other.

(I thought it could be kinda interesting)