Jean doesn't answer Eren's question because the answer is both no and depends on your attitude. Instead he watches the steam raise from Eren's body for a moment before he speaks.

"Get on the cot. Unless you want me to fuck you across the floor," which has its own appeal, he'll admit. He keeps watching Eren even as he works the straps off the lower half of his body, finally stepping out of those boots and losing the half-inch it gives him (like he needed to be taller, shooting like like a weed as he was).

The only time he stops looking at him and tracking any movement - or lack thereof - is to turn and grab a bottle of oil, unmarked, from his things.