Heart:
The center of the total personality, esp. with reference to intuition, feeling, or emotion.
The center of emotion, esp. as contrasted to the head as the center of the intellect.
The vital or essential part; core: the heart of the matter.

Sug·ar:
An affectionate or familiar term of address (sometimes offensive when used to strangers, casual acquaintances, subordinates, etc., esp. by a male to a female).
To cover, sprinkle, mix, or sweeten with sugar.
To make agreeable.