Erwin notices Levi's kisses, but he doesn't have the capacity to respond to them until Levi reaches his mouth. That gets Erwin's attention, at least part of it, and he gamely kisses him back.

Slowly, the world is creeping back in. The aftershocks of his orgasm are dying away, and Erwin focuses his eyes down the length of his nose so he can see Levi.

"Yes." His breath comes out in a rumbling sigh. "Still with you. Always."

With that, Erwin slowly crumples over onto his right side, landing next to Levi on the bed. Even as content and empty-headed as he is right now, he knows Levi wouldn't want him falling on him and spreading his come around.