"Hey, I don't want to bug you but I'd like to take you out for a cocktail or two and see if we get on as well I think we would. It's cool I know your sister she's a nice girl I hope she's doing well. Anyhow no worries if you don't want to but if you'd like to hang out it'd be my pleasure."

Just freestyling. Maybe go for the honourable man. Not that you're not. But express it?