You'll just have to ask the right questions then won't you, Levi.

There's the faintest widening of his eyes as he feels Levi's knee come to rest companionably against him. Erwin hadn't expected that...at all, really. Of course they've touched each other at home on occasion; Erwin's hand on Levi's shoulder, a brief, fleeting touch to his back, a brush of fingers as they exchange stacks of paperwork. Carriage rides necessarily meant that their legs had touched, and Erwin distinctly remembers one where they'd traveled to Stohess ahead of their mission to capture the Female Titan, with Levi's injured ankle elevated carefully in his lap.

Which is to say: it's very comforting, to know that he seems to want to keep this fleeting connection together for as long as possible, too.

Erwin is about to ask in what sort of conditions one could be far enough from another person for so long for that to be worrisome, but Levi answers it easily enough.

"I see." He only just manages to resist the urge to brush his leg more intentionally against Levi's. "How do you know when you have enough touch to use your magic?"

Erwin looks closely at Levi, watching his expressions carefully. "Are they that dangerous?"