Here are some synonyms for "sweet on you":
* Have a crush on you
* Be smitten with you
* Be infatuated with you
* Like you
* Have feelings for you
The phrase "sweet on you" is often used in a lighthearted and innocent way. It's a good way to let someone know that you find them attractive without being too forward.
Here are some examples of how "sweet on you" might be used in a sentence:
* "I think I'm sweet on you."
* "He's been sweet on her for months."
* "She's got a little crush on you. She's always sweet on you."