The Crumrin chronicles. Volume 1, The charmed & the cursed
"To help Will Crumrin adapt to the mortal world after a hundred years in the twilight realm of faeries, sis big sister Courtney makes him a glamor charm that renders him the most popular kid in school. But he eventually finds popularity a prison, in which he's surrounded by people who neither know nor care about the real him. When football star Ross, jealous of Will's friendship with outcast Tucker, bullies her relentlessly, Will decides to turn...