Hurt/Comfort is such an interesting thing. It’s basically an entire genre of fanfiction. I’d argue it satisfies a very basic, vital need–the same way that horror satisfies the basic need to be scared in a safe, controllable space.
And yet it doesn’t really have an equivalent outside of fan culture. "Tearjerkers” can sometimes come close, they’re probably the closest thing to a mainstream hurt/comfort genre that there is. But those types of books and movies don’t usually focus on the “comfort” aspect in the same way, and don’t make use of tension and release.
I think every good hurt/comfort fic makes use of tension and release just as horror does,
whether the writer is consciously aware of it or not. Though of course the tension and release in h/c comes from different sources than in horror. Instead of anticipating something frightening, you anticipate the intimacy and/or validation that comes from the “comfort” part you know is eventually coming. That’s what provides release of the tension built up during the “hurt” scenes.
I could write a goddamned essay about this it’s so fascinating.