have a sweet tooth
To be excessively fond of dessert items, such as ice cream, pies, etc.
Jill has a sweet tooth; she always orders apple pie after a meal in a restaurant.
short and sweet
Brief and to the point.
Henry's note to his father was short and sweet. He wrote, "Dear Dad, please send me $5. Love, Henry."
sweet on
In love with; very fond of.
John is sweet on Alice.
sweet talk
Too much praise; flattery.
Sometimes a girl's better judgment is overcome by sweet talk.
To get what you want by great praise; flatter.
Polly could sweet talk her husband into anything.
sweet tooth
A great weakness or predilection for sweets.
Sue has such a sweet tooth that she hardly eats anything else but cake.
sweetie pie
A person who is loved; darling; sweetheart.
Arnold blushed with pleasure when Annie called him her sweetie pie.
Nancy is Bill's sweetie pie.