A lawsuit filed in Charleston alleges a math teacher threatened to drop a teen's grades if he didn't have sex with her. It says 27-year-old Jennifer Olajire-Aro "used her age and position of authority" to coerce the student into having sex with her. The alleged incidents happened in November and December of last year, on school grounds, in the teacher's vehicle and at her home. The student was 17 at the time. The Post & Courier reports Olajire-Aro was arrested last year and charged with sexual battery of a student.