NEW YORK -- R&B star R. Kelly once compared himself to rock legend Jerry Lee Lewis — notorious for marrying his 13-year-old cousin decades ago — saying they were both misunderstood geniuses, a witness at Kelly’s sex-trafficking trial testified Thursday.The witness recounted the comment while for the first time publicly accusing Kelly of luring her into having unwanted sex with him in 1999, when she was a struggling 17-year-old hotel worker.