For Erwin, it's knowing that Levi could and doesn't, and for Levi it's ceding that vulnerability, allowing him close, that he still has the strength to move him, to use his heavier weight to hold him in place. It's nothing he couldn't break free of if he truly wanted, but it's the fact that he doesn't want to is the thrill.

He breathes, and manages to shift and grope around enough to get the extra pillows stacked for Erwin to rest against, feeling perhaps a little guilty in an odd way that he's in an uncomfortable position - but it was Erwin who had brought them here, so Levi isn't going to fuss about it. The man could just fully collapse on him, for all he cares right now.

One palm rests at the back of Erwin's neck, fingers absently swathing through the short fuzz of his undercut, the sensation sweet and grounding even as his mouth continues along his throat. Levi shivers hard, a stifled groan eliciting from the back of this throat when those kisses turn into something harder. If Erwin does try to set teeth into skin, he'll flinch and try to push him back with a hiss of not that. But otherwise, a flush is creeping over pale skin once again, his breath coming in slower, heavier pants.