[Rust? He's concerned about rust? ...Surely a sword made by a devil can't rust, anyway. Aki watches as Denji turns himself away and pushes the thermometer in his mouth, arms crossing, seeming to wait. Not five seconds pass before he reaches out and presses the button, eliciting a loud beep from the device.]

Like that.

[Maybe he's used to mercury thermometers...? Aki won't question it right now. He closes up the box and then focuses on the rag to fold it up and rub gently over the small incision on his palm. Nothing that won't heal within a couple hours, anyway. This situation has some benefits, to his chagrin.]

[When the thermometer finally beeps again, Aki reaches out before Denji can and looks at the number, waving it slightly out of some sort of habit. Definitely a fever, though it's not as bad as it could be. He looks around the room briefly, recognizing the mess he forgot about when lured in by that box he isn't thinking about anymore. Of course.]

Lay down. I'll clean all this up. ...It smells like dog in here.

[It only just really hit him. He knew they all sleep in here, but doesn't that get crowded? Maybe it feels good, in a bed covered with dogs. But it also smells extremely like an animal, due to it.]

Don't worry about anything else right now.