My sister-in-law has never been confident about her appearance and has always deliberately avoided the public eye. But her brother-in-law would give her advice on make-up and clothes. Gradually, she changed. Her smile became more refined and so did her beauty. As she began to attract the attention of those around her, her brother-in-law's heart began to beat faster. "I've always liked you," he said, only to be rebuffed. "Because we're brother and sister," he said, unable to give up his feelings...