Responses
A bit different from the situations you listed out, but "The Third Decade" is good and feels like death looming over them, but it's still ongoing. One is suicidal and the other can smell death and has had someone close to him die every 10 years and they meet when he's 30 so...
rec bl where death is a strong present theme? whether one of them dies at the end, one is already dead and comes back as a ghost, or they are in consistent threat of death like zombies apocalypse or terminally ill