sweet·heart 
(swēthärt′)
(swēthärt′)n.
1. One who is loved.
2. Used as a familiar term of endearment.
3. Informal
a. A person regarded as generous or lovable.
b. Something cherished for its excellent qualities.
adj.
Involving privileged treatment of a favored party; illegally or unethically favorable: "another land grab, another sweetheart deal based on political influence" (Village Voice).