Alright, I'll bite. We all know the big completed epic 'Fire and Ink' gets the most recs, but honestly? It's a slog after a while. The author got so deep into the arranged marriage political drama that Hanabi's agency evaporated—she became this prize fought over by Naruto-era guys. For genuinely good adult themes where she's the protagonist, I keep going back to 'Cold Hands, Warm Blood.' It's a shorter, nastier piece set in an AU where the Hyuga clan practices much darker rites. The adult content is less about graphic spice and more about power dynamics, control, and the horror of clan tradition. The scene where she has to undergo a specific ritual to 'purify' her branch house eyes is brutal and weirdly intimate. It feels truer to the potential darkness of her world than most fluffier fics.
That said, if you're just after a fun, smutty adventure, 'Kunoichi's Gambit' is a decent one-shot series. Hanabi goes undercover in a gambling den and gets in over her head with a shady merchant lord. It's plot-light but the tension is built well before it delivers. My bookmark list is full of dead fics that started strong, though—so many abandon the premise after two chapters.