You're diving into a fascinating corner of BNHA fic. I've been lurking in that tag for ages, and the dynamic really flourishes when authors lean into the philosophical clash—All Might's successor versus All for One's heir. It's rarely a straightforward romance.
One that stuck with me is 'inverse' on AO3. It's a slow, brutal burn where Midoriya gets captured, and Shigaraki's obsession shifts from destruction to possession. The power imbalance is handled with unsettling care, making the eventual shift feel earned, not forced. The prose has this gritty, almost hallucinogenic quality that fits the characters' broken mindsets.
Another is 'relics of a better world,' a post-apocalypse AU where they're the last two "quirks" left. The enemies-to-lovers arc is woven through survival, forced proximity, and grappling with the ruins of the world they both helped create. It’s less about kissing and more about finding a terrible, shared purpose.