Erwin is definitely noticing Levi's increased interest in kissing. He is taking this information and storing it away, carefully filing it with all the other things he can do that make intimacy easier and more enjoyable for Levi. Cleaning his mouth beforehand is a very small and easy price to pay, and he'll be taking the initiative on his own more often now.

When Levi goes back down on his heels, Erwin straightens up, his spine crackling as he does. He holds still as Levi slips his hand between them, and sighs when it wraps around his length. He is not going to last long today, not after all that build-up.

"I do like doing that." Obvious, perhaps, considering what Levi has in his hand, but Erwin says it anyway. "It's, ah... just as good as having it done to me. Maybe better."

It's an easy out for Levi; Erwin can't imagine he'd enjoy sucking cock himself, but that's fine. Erwin gets as much out of giving as receiving. That's true for a lot of things in the bedroom, not just oral.

He wonders how Levi would feel about ordering him around sometime.

Regardless, now is not the time to have that discussion, not when Levi's hand is giving him sweet, beautiful friction over his length. Erwin closes his eyes and leans into it, his hand moving to between Levi's shoulders to press him in against his chest.