A devastated mother has written a heartbreaking letter to her son's teacher after she sexually abused him. The young boy, who has not been named, was groomed by a teaching assistant who went on to sexually assault him, a court has heard. Alarm bells were raised when a member of the public spotted 38 year old Terri Cook out with the primary school -aged youngster in September last year. Police launched an investigation and discovered numerous messages on her phone where she had been inciting