A teacher's aid from Hull, Iowa, is accused of having sex with a 15-year-old student. 38-year-old Kelli Cuperus works at the Boyden-Hull Community School and was arrested on felony sexual abuse charges. The Sioux County Sheriff's Department believes the first incident happened in May of last year, when the boy was still 15 years old. That's where the sexual abuse charges come from, because the boy wasn't old enough to consent.