It’s funny, I actually struggle with a lot of the fics for them. Not the writing quality, which can be amazing, but the tendency to smooth over the rougher edges. You see a lot of ‘true soulmates always meant to be’ stuff that glosses over the grooming, the power imbalance, the frankly weird uncle-niece thing. That’s the whole point of their dynamic in 'House of the Dragon'—it’s messy and dark and obsessive, not a fairy tale.
Some of the best explorations I’ve found are in the AU fics. Putting them in a modern setting, or a completely different fantasy world, somehow lets writers get at the core toxicity without the canon baggage. You see the same possessiveness, the same dangerous allure, but framed in a way that lets you analyze it fresh. There was one where they were rival academics that nailed the intellectual rivalry and mutual destruction vibe perfectly.
Ultimately, the fanfiction that clicks for me is the kind that doesn’t try to justify them, but just dives into the murk. I want to see the manipulation, the ambiguity, the way their love is a political weapon. That’s where the complexity is.