I think possibly the most twisted side of Hannibal and Will’s relationship, but also the one that shows the most how they’re made for each other and pretty much no one else, is how they get each other’s sense of humor, in whatever form it comes. Hannibal sees Will’s bitter misanthropic sarcasm and is endeared by it, instead of kept at a distance by it like everybody else; Will should really not find Hannibal’s irony funny since it mostly involves murdering and eating people, stabbing, or making victims into art, but he tragically does. To the point that it gets him to smile, laugh, turn a dead man into a firefly, or watch an asshole eat his own face.
It's really interesting to think of Hannibal as someone Will still sees as keeping him safe, which I think on some level is true. Especially juxtaposing will's inherent dislike of danger and desire for control with his desire for Hannibal's danger and loss of control to Hannibal. I find it hard to read someone who is as drawn to Hannibal as Will is as not having a degree of desire for pain, turning himself into Hannibal's knife etc, especially when it compromises his primary motivation-safety.