Harry wasn't very smooth. It was just how he was. He'd been inept with Cho, for the most part. He could talk to girls just fine, so long as there was no chance of snogging, or him wanting to snog. One of his best friends was a girl. He had no idea why it made so much difference, but it seemed to. Sometimes he wished Sirius was still alive - for many reasons, most of them much more important - but at the moment, just to see if he knew how to not sound like a tongue-tied prat. He'd gotten the idea from the pictures he'd seen that neither his dad or Sirius had much trouble with girls.
And she asked what he'd hoped she wouldn't. Naturally. "I'd like to. I would, but we're not really going. Don't tell anyone that though. But yeah, I can't. Sorry?" He shot her a quick look and then suggested quickly. "Maybe next time?"