okay hear me out:
plot where muse a is being haunted by a ghost, muse b, who is their ex, and while the relationship was fine when muse b was alive, now that they've become a ghost, and muse a is trying to move on with their life, things have gotten a little more toxic.
bonus points for: - only muse a can see muse b and interact with them (including possibly physically, perhaps there's some tactile interaction) - muse b is always there to make snide and snarky comments when muse a is at work or going out with friends or even potentially on dates - moments of existential pain when muse b opens up about feeling lonely and isolated.
and on and on and on.













