In one snippet of video, Heather Lewis asks for a response from the bound and blindfolded girl on whom she is performing a sex act. There is no response. The girl is motionless. “Can I get a yes, a no, something?” says Lewis, who is accused of sexually assaulting the girl — who authorities say was a juvenile when the assaults happened — and two other juvenile girls with her former boyfriend, Robert Melia Jr., a Moorestown police officer. The abuse happened over eight years in Melia’s home, and one encounter was videotaped, authorities said. He was arrested in April 2008 and suspended from the force.