Note: Based more on Susan Kay's version than the original, detail wise, but suitable to both. A 'demon' child growing up in a religious world.
And he was good, ever so good. Usually. Except every once in awhile when he wasn't quite concentrating hard enough and unthinkingly carved a little castle in the table with his Mother's sewing scissors or stole one of her chocolates and shared it with Sasha. It made her sick, but for some reason she still loved it.
When he was bad, he'd be beaten, yelled at, and sent to study the book again, to internalize where he'd screwed up. He tried to read, to memorize, but then the rocks would come through the window and land in the middle of his bible, the sinless casting the first stones.