There are so many “s” words that seem to apply to Sir Guy: smouldering, strutting, slinking, snarling, sniffing, sneering–even smiling on occasion–and of course, SEXY. That goes without saying.
Smirk: (verb) to smile in a particularly smug, conceited or silly way. (noun) a smug, conceited or silly smile.
I do so dearly love a good Sir Guy smirk.