Ron, who'd nearly gone over backwards in startled surprise at the Professor's entrance scowled somewhat. He was pretty sure Dumbledore was perfectly capable of whipping up his own hot chocolate and he gave Harry a look that said he was pretty close to telling his git best friend what he could do with his hot chocolate.
He sighed though. "I can probably make some, yeah." He looked at Dumbledore keenly though, as if trying to get some idea of how bad things really were.