sugar-coat the pill
To make something bad, unpleasant, or dissatisfactory easier to cope with, endure, or accept. The bosses are giving everyone an extra 10% bonus this Christmas, but I suspect it's a way of sugar-coating the pill that there will be massive pay cuts in January. I have to tell my mom about wrecking her car, but I need to find a way to sugar-coat the pill first.
sugarcoat (something)
To say, explain, or present something in a manner that is easier to accept, understand, cope with, or endure. Don't sugarcoat it for me, Doc—is my wife going to make it? My grandmother was never one to sugarcoat her criticisms. If she thought you had messed up, she would tell you in no uncertain terms.