Jack's eyebrow went up and a smile curled around his lips. "Need any help choosing that lingerie?" he offered casually. He'd never exactly made a secret of the fact that he had a little bit of a thing for Martha. "I have a fair bit of experience in that field."
Plus, you know. He wanted to keep her smiling and teasing/flirting was his standard way of doing that.
He cocked his head at the Defence Force comment. "Sam Winchester? I think he's supposed to be in the team I'm going to be heading up. What's he like?"