For once in his life Cass actually did listen, maybe because Percy was one of the few men he knew took him serious enough to actually listen to him (and not expect every other word out of his mouth being a joke). And maybe Percy was right, but then he hadn't seen the look on Lettie's face when she freaked out and stopped remembering who she was.
'Maybe it's not your - or even our - problem, and maybe Lettie is fine, though if you'd seen her freak out completely as she suddenly forgot who she was and where she was in mid-conversation you might think differently.'
He smiled slightly at the offer, slightly surprised, but pleased all the same. 'I can wait until ten,' he said. 'As long as you don't expect me to do paper-work until then,' he added with a smirk.
'I could fix something from the Three Broomsticks or the Inn to eat if you're too tired to cook,' he suggested (though mentally adding that perhaps some muggle place would be better as he wouldn't have to actually pay for the food.)