I spent most of last winter digging through the Hades and Persephone tag on AO3, so I’m deep in this. The absolute standout slow-burn for me is 'to have and to hold (and to keep)' by onthetwelfth. It’s not a direct myth retelling but a modern AU where Hades runs a funeral home and Persephone is a botany grad student who starts working there. The slow burn is agonizingly good—it takes them literally 30 chapters to even hold hands, and the tension is built through these tiny, meaningful gestures. The author gets the core dynamic perfectly: that push-and-pull of death and life, melancholy and vibrancy, but without falling into the overdone 'dark mafia Hades' trope. The pacing is deliberate, with chapters dedicated to Persephone arranging flowers for a service or Hades silently fixing her leaky faucet. You feel the gravity between them grow with each small interaction, and when they finally kiss, it feels earned, not just a plot point.
Another one I keep recommending is 'Beneath the Pomegranate Trees' which is a myth-adjacent, pre-Olympian courtship story. It’s all from Persephone’ s perspective as she navigates the Underworld, not as a prisoner but as a confused guest. Hades is written with this ancient, weary loneliness that slowly thaws as she starts to reorganize his library and befriend Cerberus. The romance is so slow because it’s intertwined with her finding her own power and purpose separate from her mother. The author spends a lot of time on the world-building of the Underworld, making it feel like a character itself. It’s less about dramatic declarations and more about two people learning to communicate across an impossible divide, which makes the eventual romance feel like a quiet, profound victory.