Now this is interesting! Erwin tilts his head a little, looking down at Levi with a cocked eyebrow.

"But Levi..." he bends down, deliberately touching one of Levi's eyebrows with the tip of his nose, "I am a weird old pervert."

And then Erwin breaks out in giggles, sounding remarkably like a teenaged boy. That was an excellent joke, and he nailed it.