"Every man has his price. This is not true. But for every man there exists a bait which he cannot resist swallowing. To win over certain people to something, it is only necessary to give it a gloss of love of humanity, nobility, gentleness, self-sacrifice - and there is nothing you cannot get them to swallow. To their souls, these are the icing, the tidbit; other kinds of souls have others."
- Friedrich Nietzsche

Have you heard of sweetening a person?.....

Sweet-talk - to coax, flatter, or cajole (someone).
http://www.thefreedictionary.com/sweet-talk