Bill's thinking hadn't been that Charlie was her potion prisoner, but rather that they might have done something to spice things up in the bedroom. He wasn't sure what Penny would be open to, but he couldn't imagine Charlie saying no.
"He's scoured out the inside of his left ear," Molly said, clearly at a loss for why he might have done that. "The healers say he ruptured his eardrum." She did recognize Charlie's shirt but decided now was not the time to say anything.