...it's a safe assumption. He does carry a lot of tension in him, even if it is a little bit less these days.

The continued digging gets more of a grunt this time, now that it's less of a surprise. His toes curl a little bit, then flex again, feels the movement of his muscle against Erwin's hands. There might be the faintest, slightest hint at a flush coloring his skin high on his cheekbones, or it could be that he's warming up from the tea. Erwin passes over a spot on his ankle again that sends pleasurable little tingles along his nerves, makes his calf tense briefly to keep from shivering.

Levi inclines his chin a bit, forces his shoulders to relax.

"...all right." He takes a bit of a longer sip this time.

It's the muscles down near his ankle that really are what need the most work, and Erwin gets a few more soft noises for his trouble.

A few minutes later, the cup is empty.