[Why wouldn't Erwin open the door shirtless? He's wearing a sweet new arm, and that's given him a confidence he's been sorely lacking over the last several months. He knows the rest of him is handsome, but just assumed everyone's eyes would be immediately drawn to his stump if he appeared without a shirt. Now, he could strut around naked if he wanted to, and no one would mind.]

[Well. Levi would probably mind, hence why he's only going around shirtless.]

It is.

[Erwin's brow furrows in concentration, and there's the faint sound of electrical sparking from the new arm. A second later, it rises at the elbow, and the hand opens.]

I'm using my electricity to control it.

[Which is taking some getting used to, hence the slow, awkward movements as he takes a bag from Levi. The arm tends to move and then freeze in whatever position Erwin leaves it in.]

It feels good. I feel like something I lost has been returned to me.

[Which it has, quite literally.]

What do you think?