My favorite kind of hurt/comfort is where only one person is aware of the truth of the situation, and the story is about the other person finding out. So--someone is injured or sick and hiding it. Or one person is under psychic attack (demon possession, mind control, something) and hiding that they're slowly going insane. Because I love that moment where the other person finds out and then suddenly first is no longer alone in their suffering.

This goes double for emotional hurt/comfort, but I don't know if my favorite tropes of that really fall into the h/c categorization? Like, I love stories where one person is fairly oblivious in their relationship and slowly realizes how much emotional work the other person has taken on. Really, my favorite type is adultery stories where the story is the main couple working it out so they stay together, but it's unbelievably rare that someone writes one of those that isn't squicky in one way or another.