This idea came from iiSmolDonutii

(Oc) is dead. They killed themself and left (Crush) all alone. The only way the two can communicate is in (Crush)’s dreams. (Oc) is stuck in a little forest one bright and sunny day when they hear footsteps. They look up and see (Crush), soon realizing this is their dream. (Oc will have a mark depending on the way they kill themself. Say, Oc hung themself, then they would have a rope imprint on their throat. Oc can do anything in these dreams. Besides that, you can’t talk to crush outside of the dreams, you can only watch them walk their day to day life from inside their mind.