[There's just a tiny bit of blush on Aether's face as he watches Childe undress. A moment later, the traveler averts his gaze, deciding that it's not exactly polite to be staring like this. Once the clothing is gone and Childe begins to remove his bandages, this is when Aether shifts his gaze back to him, frowns and moves closer, trying to help peel the old bandages away. He's gentle, especially when he notes all the marks and bruising on the other's skin.

The Harbinger's voice is what makes him look up.]

Hm? Ah... yeah, I live alone. Everybody else made themselves comfortable in their own homes, so it's fine. [His attention goes back to the bandages.] It feels quiet without Paimon around... so I guess if you want to drop by and stay I have nothing against.

[A very indirect way to admitting that he's lonely here, but he doesn't want to be that honest with Childe.]

Just don't expect me to accept all your challenges.

[He knows exactly what the other wants!!]