Uh, yeah, Castle could do without the ogling. Of course, Kate could more than stand up for herself. He wasn't worried that Kate had been cheating on him in his absence. She wouldn't do that anyway, and she was so thrilled when he arrived that he was sure she would have confessed. Besides, he liked to think that his wife wouldn't sleep with the devil.
He gave an exaggerated sigh at Lucifer's words. "Oh, I'm sure. She's my biggest fan. Kind of obsessed, really."