"Well, there's always room for improvement," she nodded most seriously. "And I'd love for you to mooch off me, Harry, it's what friends are for, right?" she grinned, glad he was feeling at least a little better. Enough to tease at least.
"That might have been it, Harry, Muggle place or not. Sneaky people have done weirder things. And that's the place someone would least expect a wizarding potion to target Harry Potter," Hermione became enthusiastic in her surety in this. "That has to be it. So, now you know when it would have started. And I'll start working on an antidote." She gave him a reassuring smile, rubbing his back.