Fred could actually feel Katie giggling against him, feigning disinterest in the Auror Benefit with talk of paperwork. He made a 'tsk'ing noise with his tongue and shook his head.
"Paperwork eh? That's too bad, I was going to see if you needed something new and pretty to wear to this... thing. But if you'd much rather push a quill around than be seen with your husband then well..."
He shrugged and sighed heavily, overexaggerating his disappointment and waiting to see if Katie buckled under the teasing.