Maybe that nice young man over there will get me a hamburger if I smile sweetly.
From the dailymail.co.uk
You would have thought it was the 1950s, the scene was so sweetly old-fashioned.
From the thestate.com
The carrot cake, though not made on the premises, was the most sweetly soothing.
From the events.nytimes.com
Deborah Oliver Artis in her own way is just as effective as sweetly bossy Weedy.
From the chron.com
Nothing swells with possibility quite as sweetly as baseball's Opening Day does.
From the ocregister.com
Talk sweetly to your cat for a better response, or tease him with a favorite toy.
From the sacbee.com
The women adorn us with sweetly scented frangipani leis, and pull us to our feet.
From the nzherald.co.nz
With this this sort of horsepower, Honeycomb runs as sweetly as you would expect.
From the theaustralian.com.au
The accompanying coleslaw is green with parsley and scallions, and sweetly fresh.
From the washingtonpost.com
More examples
In an affectionate or loving manner (`sweet' is sometimes a poetic or informal variant of `sweetly'); "Susan Hayward plays the wife sharply and sweetly"; "how sweet the moonlight sleeps upon this bank"- Shakespeare; "talking sweet to each other"
Sweet is one of the five basic tastes and is almost universally regarded as a pleasurable experience. ...