Portuguese.
It's not just the accent, but the choice of words and phrases.
I once was asked out by a Portuguese colleague, after a project we were on together finished. I didn't say yes, as the feeling wasn't mutual. He was a good friend, and a nice guy, but just not my type.
But I kept the voicemail ......
Think South European charm, but without any sense of arrogance. i think he asked if I would do him the honour of having Saturday lunch at the Oxo Tower one weekend. Saturday lunch = very clearly not a work-related lunch, but equally none of the pressure of a Friday or Saturday evening first date.