Dean didn't really mind he blunt attitude, or the tendency toward caustic humor. If he minded that sort of thing really, then he'd never have liked her to start with. Maybe it was him romanticizing a pretty girl - but he liked to think that a lot of how she reacted was a cover for a softer side he saw crop up, now and then.
"Well, you can snog her, if you want. But she might not like birds, since she's snogging Vaisey," Dean answered. He smiled a little and shook his head.
He looked at her as she stepped in. "I don't always get what I want, Greengrass. And you say it now - but what about when your House finds out? Or your family? Your sister? Don't get me wrong, I'm a brilliant bloke. But am I worth the trouble you'd bring on yourself?" And possibly him, but Dean wasn't considering that as much.