Sirius's brain began screaming 'Danger, danger! You're alone in a room with a pretty girl. One you swore never to snog again. Run away!'
Sirius promptly told his his brain to shut up, please.
"Well," he said, laying his own light saber down and sitting on the bench across from her (not next to her- bad plan), "I open doors. Sometimes. And I say please and thank you. Most of the time. And I...respect women. Yes. That's a big part. Unless they don't want to be respected," he added, shrugging and smirking at her.