The whole concept feels like an extreme pressure cooker where physical danger and emotional strain strip away every layer of social nicety. You've got characters who've been through hell, living with constant dread, and that tension has to go somewhere. I think the smut takes that unspoken, desperate need for connection—or control, or release—and pushes it to a logical, if heightened, conclusion.
Levi's a great example. His control is legendary, but in these stories, that rigidity shatters under intense scenarios. It's never just about the act; it's about him finally relinquishing command, or conversely, exerting it in a domain completely separate from battlefield orders. The appeal lies in that fracture. For someone like Jean, it might explore his buried insecurities and longing for validation morphing into something more physically assertive.
Honestly, it's less about 'hidden desires' in a purely sexual sense and more about using that framework to examine their psyche. When survival is the baseline, any intimacy becomes charged with meanings it wouldn't have in a normal world. The smut amplifies that charge, letting readers explore the 'what if' of those breaking points.
I once read a piece where Eren's rage and drive were reinterpreted as this all-consuming, possessive passion, which felt oddly true to his character, just channeled differently.