How about a bit of a kinky thing a girl did for me as a tease years ago;
Years ago I took my date out to a posh restaurant where we were eating in a fairly busy area. It was one of those expensive places you visit when you really want to impress and then regret spending the money for the next month. I was dressed to impress and she looked stunning. Very elegant and classy in a evening dress, and gettign the eye of a lot of the male staff and others out for a meal.. Half way through the main course I noticed her lipstick had smudged and tried to give her the heads up in a polite kind way in a natural break in conversation. I said something along the lines of “do you know your lipstick is smudged?” in a casual way hoping not to offend her or embarrass her.