Lauren Harrington-Cooper of Plymouth is a high school English teacher in the Wyoming Valley West Scho0l District.
Investigators said Thursday morning, the parents of a high school senior told the principal they found explicit sexual text messages between their son and a teacher, later identified as Cooper.
A county detective said Cooper admitted to having oral sex and sexual intercourse with the student in her car several times.
She was charged with institutional sex assault, a felony and released on bail.
Harrington-Cooper is due back in court on December 26.
There is no word on her job status after her arrest.