It was very tempting to laugh, yet Cass knew that Percy wasn't joking. Smirking he gave him an affectionate glance.
'See that would work perfectly well if they were strangers - now since these people are my friends, and I like to keep them as such, I think a bit more in the way of explanation than none of your business will be needed.'
He smiled. 'There is no need for you to worry about that though. I'll think of something. I'm good with secrets and lies remember,' he said. 'It's nothing I need to think of today at least.' He'd give it some more thought, eventually.